Audi A8 L Quattro 2007 - ENGINE 4.2 Liter V8 4V Engine Mechanical, Engine Code(s): BVJ - A8

Audi A8 L Quattro 2007 - 00 - General, Technical Data Engine number

Fig. 1: Audi A8 L Quattro 2007 - Component Locations - Identifying Engine Number Stamped On Engine Block

• Engine number ("engine code" and "serial number") is located at front on cylinder block at top - arrow -.
• The engine code is also located on vehicle data plate.

NOTE:

The engine number is only visible if the front engine cover is removed.

Audi A8 L Quattro 2007 - Engine data Engine data

Code letters	BVJ
Displacement	ltr.	4.163
Output	kW at 1/rpm	257/6800
Torque	Nm at RPM	440/3500
Bore	dia. mm	84,5
Stroke	mm	92,8
Compression ratio	12,5
RON	98 1)
Fuel injection and ignition system	Bosch Motronic
Ignition sequence	1-5-4-8-6-3-7-2
Charging	No
Oxygen sensor regulation	4 sensors
Variable valve timing	Yes
Variable intake manifold	Yes
Secondary air injection (AIR) system	Yes
Valves per cylinder	4
1) Super unleaded RON 95 is permissible, although with reduced power.

Audi A8 L Quattro 2007 - Safety precautions Safety precautions

Note the following when working on the fuel system:

CAUTION:

There is a risk of injury because the fuel is under very high pressure. Before opening high pressure area of the fuel injection system, fuel pressure must be relieved to residual pressure. To reduce remaining residual pressure, lay a clean cloth around the connector and carefully loosen connector.

To prevent personal injury and damage to the injection and ignition system, observe the following:

• The ignition must be switched off before connecting or disconnecting injection and ignition system wiring or tester cables.
• Only clean engine with ignition switched off.
• If electrical connectors were disconnected, faults are saved in ECM:

• Connect Vehicle Diagnosis, testing info. system VAS 5051.
• Start "Guided Functions" operating mode.
• Generate readiness code in ECM.

CAUTION:

Risk of destroying electrical components when battery is disconnected. Observe measures when disconnecting battery. Only disconnect battery with ignition switched off.

Note the following when working on the cooling system:

CAUTION:

Risk of scalding due to hot steam and hot coolant. When the engine is warm the cooling system is under pressure. To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

If it is necessary to use testing and measuring devices on road tests, observe the following:

CAUTION:

Risk of injury due to deployment of passenger airbag in a collision. Always secure testing and measuring equipment on the rear seat and have a second person operate it from there.

Audi A8 L Quattro 2007 - Procedure before opening fuel injection system high pressure area

• The fuel injection system is separated into a high-pressure section (max. approx. 120 bar) and a low-pressure section (approx. 6 bar).
• Before a component in the fuel injection system high pressure area is remove, the fuel pressure must definitely be reduced to a residual pressure of approx. 6 bar, as described in the following.

Special tools, testers and auxiliary items required

• Vehicle diagnostic, testing, and information system VAS 5051

Work procedure

• Start engine and run at idle speed.

Fig. 2: Audi A8 L Quattro 2007 - Component Locations - Connecting Data Link Connector (DLC)

• Connect Vehicle Diagnosis, testing info. system VAS 5051.

Fig. 3: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display

Display on VAS 5051 :

• Click on Vehicle Self-Diagnosis button.

Fig. 4: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display - "01 - Engine Electronics"

Display on VAS 5051 :

• In selection - 1 - , press vehicle system "01 - Engine electronics".
• Wait until next display appears.

Fig. 5: Audi A8 L Quattro 2007 - Component Locations - VAS 5051 Tester Displaying Control Module Identification And Coding

Display on VAS 5051 :

1 - Control module identification of engine control module (ECM)

• Click on --> button.

Fig. 6: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display - Basic Setting

Display on VAS 5051 :

1 - Selection of diagnostic functions

• In selection - 1 - , click on diagnostic function "08 - Read measuring value block".

Fig. 7: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display - Display Group And Key Pad

Display on VAS 5051 :

• In button field - 2 - , press buttons 1 4 0 for "display group 140" and confirm entry by pressing Q button.

Fig. 8: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display

Display on VAS 5051 :

• Check display for fuel pressure in fuel rail in display field - 3 -.

Example:

3 - 40.63 bar

Fig. 9: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connector At Fuel Metering Valve 2 N402 On Left High Pressure Pump

• Disconnect electrical connector - arrow - at Fuel Metering Valve 2 N402 on left high pressure pump.

Fig. 10: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connector At Fuel Metering Valve N290 On Right High Pressure Pump

• Disconnect electrical connector - arrow - at Fuel Metering Valve N290 on right high pressure pump.

Fig. 11: Audi A8 L Quattro 2007 - Component Locations - Diagnostic System VAS 5051: Display

Display on VAS 5051 :

• Check indication in display field - 3 - :

• Fuel pressure in fuel rail must sink to approx. 6 bar.

• Switch off ignition.

The fuel rail will continue to be filled with fuel, but it will no longer be under high pressure.

Now components or lines can be opened. Lay a clean cloth around connection points and collect escaping fuel.

Final procedures

• Reconnect electrical harness connectors.

Faults are saved in ECM when electrical connectors are disconnected:

• Connect Vehicle Diagnosis, testing info. system VAS 5051.
• Start "Guided Functions" operating mode.
• Generate readiness code in ECM.

Audi A8 L Quattro 2007 - Rules for cleanliness Rules for cleanliness

Even minor contaminations can lead to malfunctions in the fuel injection system. When working on coolant supply and fuel injection system, observe the following rules of cleanliness:

• Before loosening, connections and surrounding areas must be cleaned thoroughly with engine or brake cleaner, and then cleaned area must be dried completely.
• Immediately seal off lines and connections with clean plugs or protective caps.
• Place parts that have been removed on a clean surface and cover them. Do not use fluffy cloths!
• Only install clean components: Only unpack replacement parts immediately prior to installation. Do not use parts that have been stored unpackaged (e.g. in tool boxes etc.).

• If system is open, do not work with compressed air and do not move the vehicle.
• Protect disconnected electrical connectors from dirt and moisture and only connect if dry.

Audi A8 L Quattro 2007 - 10 - Engine - Assembly Engine, removing

NOTE:

With lock carrier installed, engine is removed downward with transmission and subframe. Drained coolant must be stored in a clean container for disposal or reuse. During installation, all cable ties must be re-installed at the same location.

Fig. 12: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Engine, Removing

Special tools, testers and auxiliary items required

• Pry lever 80 - 200
• Old oil collecting and extracting device V.A.G 1782
• Hose clamp pliers V.A.G 1921
• Spring-type clip pliers VAS 5024 A

• Step ladder VAS 5085
• Scissor Lift Table VAS 6131 with Support Set VAS 6131/10 and Supplementary Set VAS 6131/11 and VAS 6131/12

Special tools, testers and auxiliary items required

Fig. 13: Audi A8 L Quattro 2007 - Component Locations - Ring Screw 3368

• Ring screw 3368

Fig. 14: Audi A8 L Quattro 2007 - Component Locations - Drip Tray For Workshop Crane VAS 6208

• Drip tray for workshop crane VAS 6208

Fig. 15: Audi A8 L Quattro 2007 - Component Locations - Tension Strap T10038

• Tension strap T10038

Work procedure

CAUTION:

There is a risk of injury because the fuel is under very high pressure. Before opening high pressure area of the fuel injection system, fuel pressure must be relieved to residual pressure.

• Reduce fuel pressure in high pressure area --> Procedure before opening fuel injection system high pressure area.
• Discharge refrigerant circuit Refrigerant R134a - Servicing.
• Extract hydraulic oil for power-steering from reservoir using old oil collecting and extracting device V.A.G 1782.

CAUTION:

Risk of destroying electrical components when battery is disconnected. Observe measures when disconnecting battery.

NOTE:

So that the front wheels can still be turned with the battery disconnected, the battery must only be disconnected with ignition key inserted. In order for the driveshaft to be able to rotate for removal, the electronic parking brake must be released before disconnecting battery.

Fig. 16: Audi A8 L Quattro 2007 - Component Locations - Removing Cover Of Right Luggage Compartment Side Trim

• Remove cover of right luggage compartment side trim - arrows -.

Fig. 17: Audi A8 L Quattro 2007 - Component Locations - Removing Cover Above Battery

• Remove cover - 1 - above battery.

NOTE:

Ignore - 2 -.

Fig. 18: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Battery Ground (GND) Strap

• With ignition switched off, disconnect Battery Ground (GND) strap - arrow -.

Fig. 19: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover off - arrows -.

Fig. 20: Audi A8 L Quattro 2007 - Component Locations - Removing Front Engine Cover

• Pull front engine cover off - arrows -.

CAUTION:

Risk of scalding due to hot steam and hot coolant. When the engine is warm the cooling system is under pressure. To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

• Open cap on coolant expansion tank.
• Remove both front wheels.
• Remove front part of left front wheel housing liner --> 66 - EXTERIOR EQUIPMENT .
• Remove front and rear part of right front wheel housing liner --> 66 - EXTERIOR EQUIPMENT .

Fig. 21: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove sound insulation by loosening fasteners - 1, 2, 4 -.

NOTE:

Ignore - 3 -.

• Place drip tray for workshop crane VAS 6208 under engine.

Fig. 22: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Coolant Thermostat Housing

• Remove drain plug - 1 - on Map Controlled Engine Cooling Thermostat F265 and allow coolant to drain.

NOTE:

Ignore - 2 -.

Fig. 23: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Front Coolant Pipe

• Remove drain plug - arrow - at front coolant pipe and drain coolant.

Fig. 24: Audi A8 L Quattro 2007 - Component Locations - Coolant Hoses

• Remove coolant hoses - 1 and 2 - and drain coolant.

Fig. 25: Audi A8 L Quattro 2007 - Component Locations - Vacuum Line

• Disconnect vacuum line - arrow -.

CAUTION:

Risk of damaging coolant lines and hoses. Do not stretch, kink or bend coolant lines and hoses.

Fig. 26: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts & Right Refrigerant Line From A/C Compressor

• Remove bolts - 1 and 2 -.
• Disconnect refrigerant lines from A/C compressor.

NOTE:

To prevent dirt and moisture from entering, seal off open lines and connections with clean plugs or protective caps.

Fig. 27: Audi A8 L Quattro 2007 - Component Locations - ATF Cooler From Coolant Hoses

• Remove bolts - arrows -.
• Remove coolant pipe to ATF cooler from coolant hoses - 2, 3, 4 -.

NOTE:

Ignore - 1 -.

Fig. 28: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) Air Guide Hose & Bolts

• Free up secondary air injection (AIR) air guide hose - 1 - on ATF cooler bracket.
• Remove bolts - arrows -.
• Remove ATF cooler and secure it on engine carrier.

Fig. 29: Audi A8 L Quattro 2007 - Component Locations - Right Coolant Hose

• Place drip tray for workshop crane VAS 6208 under engine.
• Disconnect right coolant hose - arrow - and drain coolant.

Fig. 30: Audi A8 L Quattro 2007 - Component Locations - Identifying Vacuum Line, Air Guide Hose, Crankcase Ventilation Hose & Hose Clamps

• Free up fuel line and line to EVAP canister on air guide pipe.
• Disconnect electrical harness connector - 1 - at Mass Air Flow (MAF) Sensor G70.
• Remove vacuum line - 4 - to air guide hose from suction jet pump.

CAUTION:

Risk of violating emissions legislation. Do not open hose connection - 3 - !

• Lay aside air guide hose with connected crankcase ventilation hose - 3 - by loosening hose clamps - 2 and 5 -.

Fig. 31: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) Air Guide Hose & Coolant Hose

• Disconnect secondary air injection (AIR) air guide hose - 1 -.
• Remove coolant hose - 2 - by pulling clip out slightly.

Fig. 32: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove nuts - arrows - and remove right electrical connectors bracket from bulkhead.

NOTE:

Ignore items - 1 to 4 -.

Fig. 33: Audi A8 L Quattro 2007 - Component Locations - Vacuum Hose, Coolant Hose & Torque Support Bolt

• Disconnect vacuum hose - 1 -.
• Remove coolant hose - 2 - from right coolant pipe.
• Remove torque support bolt - 3 -.

CAUTION:

Risk of injury from fuel. To reduce fuel pressure, lay cloths around connecting point before opening fuel system and carefully loosen.

Fig. 34: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Fuel Supply Line On Distribution Piece

• Disconnect fuel supply line - arrow - on distribution piece.

Fig. 35: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 Electrical Harness Connector

• Disconnect electrical connector - 2 - on Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 and remove vacuum hose - 1 -.
• Remove Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 from bracket and lay aside with hose connected.
• Remove coolant hose - arrow - and lay it aside.

NOTE:

To collect escaping hydraulic oil, lay a cloth under separating point.

Fig. 36: Audi A8 L Quattro 2007 - Component Locations - Power Steering Hydraulic Pressure Line & Coolant Hose

• Disconnect power steering hydraulic pressure line - 1 -.
• Remove coolant hose - 2 - from left lower coolant line.

NOTE:

To collect escaping hydraulic oil, lay a cloth under separating point.

Fig. 37: Audi A8 L Quattro 2007 - Component Locations - Hydraulic Hose

• Remove hydraulic hose - arrow - from bottom of hydraulic oil reservoir.

Fig. 38: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - and remove plenum chamber covers - 2 and 3 -.

Fig. 39: Audi A8 L Quattro 2007 - Component Locations - Identifying Wiper Arm Nuts

• Pry out cover caps on windshield wiper arms with a screwdriver and loosen nuts - arrows - a few turns.
• Loosen wiper arms by tilting slightly from windshield wiper axle.
• Remove nuts completely and remove wiper arms.

NOTE:

If wiper arms cannot be removed in this way, use a standard puller.

• Remove dust and pollen filter by opening 4 quick-release fasteners.

NOTE:

Cover air duct at air conditioning housing with a clean rag so that nothing can fall in.

Fig. 40: Audi A8 L Quattro 2007 - Component Locations - Left/Right For Cowl Grill

• Remove bolts - arrows - at left and right for cowl grill - 1 -.
• Carefully pull cowl grill off from retainers at windshield.

Fig. 41: Audi A8 L Quattro 2007 - Component Locations - Strut Tower Brace

• Remove strut tower brace - arrow -.

Fig. 42: Audi A8 L Quattro 2007 - Component Locations - Removing Cover Over Engine Control Module (ECM)

• Remove cover over engine control module (ECM) - arrows -.

Fig. 43: Audi A8 L Quattro 2007 - Component Locations - Removing Retaining Bracket And ECM From E-Box Plenum Chamber

• Remove bolts - arrows -.
• Remove retaining bracket and ECM from E-box plenum chamber.

NOTE:

Electrical harnesses remains connected.

Fig. 44: Audi A8 L Quattro 2007 - Component Locations - Removing Air Quality Sensor G238 & Retaining Clips

• Remove Air Quality Sensor G238 by rotating approx. 90? counter-clockwise - arrow - and removing from bracket.
• Release retaining clips - 1 to 4 -.
• Fold cover for E-box in plenum chamber, open slightly and pull off toward front.

Fig. 45: Audi A8 L Quattro 2007 - Component Locations - Multi-Pin Harness Connectors

• Disconnect multi-pin harness connectors - arrows - using spark plug connector pliers V.A.G 1922.
• Disengage wiring harness at E-Box and bulkhead.
• Lay wiring harness aside on engine with engine control module (ECM) connected.
• Secure ECM against falling down.

• Remove lower right A-pillar trim --> 70 - INTERIOR TRIM .
• Fold floor covering back.
• Remove protective cover from above main fuse holder.

Fig. 46: Audi A8 L Quattro 2007 - Component Locations - Identifying Terminal 30 Wire To Starter Cap & Nut

• Fold cap - 2 - aside.
• Remove nut - 4 -.
• Remove terminal 30 wire to starter.

NOTE:

Ignore items - 1 and 3 -.

Fig. 47: Audi A8 L Quattro 2007 - Component Locations - Harness Clamp

• Remove harness clamp - 1 -.

NOTE:

Ignore - 2 -.

Fig. 48: Audi A8 L Quattro 2007 - Component Locations - Electrical Connector, Ground (GND) Wire & Wiring Harness Bracket From Longmember

• Separate electrical connector - 2 -.
• Remove Ground (GND) wire - 1 - from longmember.
• Remove wiring harness bracket from longmember - arrows -.
• Free up wiring harness.

Fig. 49: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Level Control System Sensor Electrical Harness Connector & Left/Right Control Arms Coupling Rod

• Disconnect electrical harness connector - 2 - at Level Control System Sensor.
• Disconnect connecting link - 1 - from control arm.
• Repeat work procedure on opposite side of vehicle.

Fig. 50: Audi A8 L Quattro 2007 - Component Locations - Identifying Collar Bolt For Right Drive Axle

• Have a second technician press brake pedal.

CAUTION:

Risk of damaging wheel bearing. To loosen drive shaft collar bolt, vehicle must not be resting on wheels.

• Remove collar bolt - 2 - at left and right drive axles - 1 -.

Fig. 51: Audi A8 L Quattro 2007 - Component Locations - Stabilizer & Bolts

• Remove bolts - arrows - uniformly at left and right.
• Remove stabilizer.

Fig. 52: Audi A8 L Quattro 2007 - Component Locations - Positioning Lifting Eyebolt 3368 Into Hole At Suspension Strut Dome And Securing With Washer And Nut

• Insert left and right Lifting Eyebolt 3368 from below into hole in strut tower.
• Secure Lifting Eyebolt 3368 with a nut - 2 - with washer - 1 - over several threads (do not install nut all the way down on threads).

CAUTION:

Risk of damaging axle joints on upper control arms. Support wheel bearing housing.

• Tie up wheel bearing housing at left and right with Tensioning Strap T10038 as shown in illustration.

Fig. 53: Audi A8 L Quattro 2007 - Component Locations - Air Spring Damper Bolt

• Remove air spring damper bolt - arrow - from control arm.

Fig. 54: Audi A8 L Quattro 2007 - Component Locations - Guide Control Arm & Control Arm

• Remove guide control arm - 1 - and control arm - 2 - from subframe.

Fig. 55: Audi A8 L Quattro 2007 - Component Locations - Identifying Guide Control Arms And Track Control Arms

• Pivot guide control arm - 1 - and control arm - 2 - outward.

CAUTION:

Risk of damaging axle joints on guide control arm and control arm. Tie guide control arm and control arm up to wheel bearing housing - arrows -.

• Remove drive axle from transmission flanged shaft.

CAUTION:

Risk of damaging brake line. Carefully tilt wheel bearing housing toward outside.

• Remove drive axle.
• Repeat work procedure on opposite side of vehicle.

Fig. 56: Audi A8 L Quattro 2007 - Component Locations - Front Transverse Beam

• Remove front transverse beam - arrows -.

Fig. 57: Audi A8 L Quattro 2007 - Component Locations - Left Front Muffler Nuts

• Remove left front muffler nuts - 1 -.

NOTE:

Ignore items - 2 and 3 -.

Fig. 58: Audi A8 L Quattro 2007 - Component Locations - Right Front Muffler Nuts

• Remove right front muffler nuts - 1 -.

NOTE:

Ignore - 2 -.

CAUTION:

Risk of damaging decoupling elements in front exhaust pipe. Do not bend decoupling elements in front exhaust pipe more than 10?.

Fig. 59: Audi A8 L Quattro 2007 - Component Locations - Front Muffler Retaining Straps Nuts

• Remove nuts - arrows - on front muffler retaining straps.

Fig. 60: Audi A8 L Quattro 2007 - Component Locations - Exhaust System Clamping Sleeves

• Disconnect exhaust system at clamping sleeves - 1 and 2 - and remove front muffler.

Fig. 61: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Heat Shield For Driveshaft

• If present, remove heat shield - A - for driveshaft - arrows -.
• Remove bolts that connect driveshaft to transmission.
• Slide driveshaft back to rear final drive; constant velocity joints can move axially.

Fig. 62: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Tied To Side, Onto Heat Shield

• Tie driveshaft up and to the side against heat shield - arrow -.

Fig. 63: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Prepare scissor lift platform:

Fig. 64: Audi A8 L Quattro 2007 - Component Locations - Identifying Scissor Lift Platform VAS 6131

• Equip Scissor Lift Table VAS 6131 with Support Set VAS 6131/10 as well as Supplementary Set VAS 6131/11 and VAS 6131/12 as follows:

Platform coordinates	Parts from Support Set VAS 6131/10 , Supplementary Set VAS 6131/11 and VAS 6131/12
B3	/10-1	/10-4	/10-5	/10-12
G3	/10-1	/10-4	/10-5	/10-11
B10	/10-1	/10-2	/10-5	/12-1
G10	/10-1	/10-2	/10-5	/11-3
C14	/10-1	/10-3	/10-5	/10-12
F14	/10-1	/10-3	/10-5	/10-12

• Install attachments on scissor lift table by hand first.
• Place scissor lift platform VAS 6131 in horizontal position.

• Note bubble level (sight glass) on support platform.

• Drive scissor lift platform VAS 6131 under engine/transmission subassembly.

Fig. 65: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 At Front On Engine

• Position support elements from VAS 6131/10 at front on engine as shown in illustration.
• Ensure right threaded spindle at front of engine is completely installed.

Fig. 66: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/12 At Left On Transmission

• Position support elements from VAS 6131/12 at left on transmission as shown in illustration.

Fig. 67: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/11 At Right On Transmission

• Position support elements from VAS 6131/11 at right on transmission as shown in illustration.

Fig. 68: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 At Rear On Transmission

• Position support elements from VAS 6131/10 at rear on transmission as shown in illustration.
• Twist all spindles of support elements upward far enough until all support pins make contact at support points.
• Tighten base plates for support elements to 20 Nm on scissor lift platform VAS 6131.

Fig. 69: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts At Tunnel Cross Member

• Remove bolts - arrows - at tunnel cross member.

Fig. 70: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Mark installation position of subframe on longmember using a felt tip pen.
• Remove bolts - 1 and 4 -.
• Remove bolts - 2 and 3 - in diagonal sequence and in stages.

CAUTION:

Risk of damaging hose and wiring connections as well as engine compartment. Check whether all are loosened between engine, transmission, subframe and body. Carefully guide engine-transmission assembly with subframe out of engine compartment while lowering.

Fig. 71: Audi A8 L Quattro 2007 - Component Locations - Lowering/Lifting Engine/Transmission Assembly Using Scissor Lift Platform VAS 6131 Only Approx. By Dimension

• First lower engine/transmission assembly using scissor lift platform VAS 6131 only approx. by dimension - a -.

• Dimension - a - = 120 mm maximum.

• Identify installation position of selector lever cable bracket with a felt-tip pen for re-installation.

Fig. 72: Audi A8 L Quattro 2007 - Component Locations - Ball Socket & Selector Lever Cable Bolts

• Press ball socket - 1 - of selector lever cable from selector shaft lever using pry lever 80 - 200.
• Remove bolts - 2 and 3 - and remove selector lever cable from transmission.
• Lower engine/transmission subassembly downward.
• Push scissor lift platform VAS 6131 with engine/transmission subassembly under vehicle.

Audi A8 L Quattro 2007 - Engine and transmission, separating Engine and transmission, separating

Special tools, testers and auxiliary items required

Fig. 73: Audi A8 L Quattro 2007 - Component Locations - Bracket 30 - 211 A

• Bracket 30 - 211 A
• Adapter VAS 6131/12-1 qty. 2

Fig. 74: Audi A8 L Quattro 2007 - Component Locations - Socket T40058

• Socket T40058

Work procedure

• Engine/transmission unit removed and attached to scissor lift platform VAS 6131.

Fig. 75: Audi A8 L Quattro 2007 - Component Locations - Front Transmission Mount Left/Right Bolts

• Remove front transmission mount left and right bolts - arrows - and lay subframe on scissor lift table.

Fig. 76: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bottom Engine/Transmission Connecting Bolts

• Remove lower engine-transmission connecting bolts - arrows -.

Fig. 77: Audi A8 L Quattro 2007 - Component Locations - Identifying Scissor Lift Platform VAS 6131

• Equip Scissor Lift Table VAS 6131 with Support Set VAS 6131/10 and supplementary set VAS 6131/12 as follows:

Platform coordinates	Parts from Support Set VAS 6131/10 , Supplementary Set VAS 6131/11 and VAS 6131/12
B3 1)	/10-1	/10-4	/10-5	/10-12
G3 1)	/10-1	/10-4	/10-5	/10-11
C6	/10-1	/10-4	/10-5	/12-1
F6	/10-1	/10-4	/10-5	/12-1
B10 1)	/10-1	/10-2	/10-5	/12-1
G10 1)	/10-1	/10-2	/10-5	/11-3
C14 1)	/10-1	/10-3	/10-5	/10-12
F14 1)	/10-1	/10-3	/10-5	/10-12
1) The support elements remain unchanged.

Fig. 78: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 And VAS 6131/12 At Left On Engine

• Position support elements from VAS 6131/10 and VAS 6131/12 at left on engine as shown in illustration.

Fig. 79: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 And VAS 6131/12 At Right

• Position support elements from VAS 6131/10 and VAS 6131/12 at right on engine as shown in illustration.
• Twist spindles of attachments upward far enough until all support pins make contact at support points.
• Tighten base plates for support elements to 20 Nm on scissor lift platform VAS 6131.

Fig. 80: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/12 At Left On Transmission

• Turn spindle of left support element on transmission all the way down.
• Remove left support element base plate from Scissor Lift Table VAS 6131.

Fig. 81: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/11 At Right On Transmission

• Turn spindle of right support element on transmission all the way down.
• Remove right support element base plate from Scissor Lift Table VAS 6131.
• Remove subframe to the side.

CAUTION:

Risk of falling due to lack of support. After removing subframe, position transmission mounting elements at the front again in the same location.

Fig. 82: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove electrical harness connectors from bracket and disconnect it:

3 - For Heated Oxygen Sensor (HO2S) 2 G108

4 - For Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131

• Free up electrical wires to oxygen sensors.

NOTE:

The illustration shows electrical connectors in installation positions. Ignore items - 1, 2 and arrows -.

Fig. 83: Audi A8 L Quattro 2007 - Component Locations - Left Front Muffler Nuts

• Remove bolt - 2 - at left catalytic converter bracket.

NOTE:

Ignore items - 1 and 3 -.

Fig. 84: Audi A8 L Quattro 2007 - Component Locations - Oil Dipstick Guide Tube, Pivot Hydraulic Oil Pipe & Coolant Pipe Bolts

• Remove bolt - 1 - and remove oil dipstick guide tube upward.
• Remove bolts - 4 and 5 - and pivot hydraulic oil pipe to side.
• Remove bolts - 2 and 3 - and remove left coolant pipe from coolant hoses - arrows -.

Fig. 85: Audi A8 L Quattro 2007 - Component Locations - Exhaust Manifold Nuts

• Remove bolt - arrow - and pull hydraulic oil pressure pipe forward slightly.
• Remove nuts - 6 through 1 - and remove left exhaust manifold with catalytic converter.

NOTE:

Both lower securing strips remain installed.

Fig. 86: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connector On Engine Speed (RPM) Sensor G28

• Disconnect electrical connector - arrow - on Engine Speed (RPM) Sensor G28.

CAUTION:

Risk of destroying transmission control module (Mechatronic) with static discharge. Do not touch contacts in transmission connector with hands.

• To discharge static electricity, touch transmission housing with hand (without wearing gloves).

Fig. 87: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Harness Connector On Transmission

• Disconnect electrical connector on transmission by turning twist lock counter-clockwise - arrow -.

Fig. 88: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove electrical harness connectors from bracket and disconnect it:

1. For Heated Oxygen Sensor (HO2S) G39
2. For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130

• Free up electrical wires to oxygen sensors.

NOTE:

The illustration shows electrical connectors in installation positions. Ignore items - 3, 4 and arrows -.

Fig. 89: Audi A8 L Quattro 2007 - Component Locations - Coolant Pipe, Coolant Hoses & Bolts

• Remove bolts - 1 and 2 - and remove right coolant pipe from coolant hoses - arrows -.

Fig. 90: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolts

• Remove bolts - arrows - and remove torque support mount.

Fig. 91: Audi A8 L Quattro 2007 - Component Locations - Torque Support & Bolts

• Remove bolts - 2 through 5 - and remove torque support.

NOTE:

Ignore - 1 -.

Fig. 92: Audi A8 L Quattro 2007 - Component Locations - Right Front Muffler Nuts

• Remove bolt - 2 - at right catalytic converter bracket.

NOTE:

Ignore - 1 -.

Fig. 93: Audi A8 L Quattro 2007 - Component Locations - Right Exhaust Manifold With Catalytic Converter Nuts

• Remove nuts - 6 through 1 - and remove right exhaust manifold with catalytic converter.

NOTE:

Both lower securing strips remain installed.

• Free up ATF cooler on engine carrier and secure it from falling down.

Fig. 94: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts For Engine Mount At Left/Right

• Remove engine bracket bolts at left and right - arrows -.
• Remove engine carrier.

Fig. 95: Audi A8 L Quattro 2007 - Component Locations - Right Engine Mount Electrical Harness Connector, Right Engine Support Electrical Wiring Bracket & Engine Support With Engine Mount Bolts

• Disconnect electrical harness connector - 2 - at right engine mount.
• Remove electrical wiring bracket - 1 - from right engine support.
• Remove bolts - arrows - and remove engine support with engine mount.

Fig. 96: Audi A8 L Quattro 2007 - Component Locations - Identifying Ground (GND) Wire, Starter Electrical Wires, Bolts & Starter

• Remove Ground (GND) wire - 1 -.
• Disconnect electrical wires - 3 and 4 - from starter.
• Remove bolts - 2 and 5 - and remove starter.

Fig. 97: Audi A8 L Quattro 2007 - Component Locations - ATF-Lines Bracket Nuts

• Remove nut - arrow - and remove ATF-lines from bracket.

Fig. 98: Audi A8 L Quattro 2007 - Component Locations - Inserting Guide Pin Of Adapter T40058 So Large Diameter Points To Engine

• Insert guide pin of socket T40058 so that small diameter - arrow 2 - points to engine. Large diameter - arrow 1 - points to socket.

Fig. 99: Audi A8 L Quattro 2007 - Component Locations - Using Socket T40058 To Rotate Crankshaft To TDC

• To loosen torque converter bolts, counterhold crankshaft using socket T40058.

NOTE:

Disregard - arrow -.

Fig. 100: Audi A8 L Quattro 2007 - Component Locations - Torque Converter Bolts

• Remove 3 torque converter bolts - arrow - in opening on removed starter (turn crankshaft ¹ /₃ rotation in each case).

Fig. 101: Audi A8 L Quattro 2007 - Component Locations - Identifying Engine/Transmission Threaded Connections

• Remove engine-transmission connecting bolts - 3 through 7 -.

NOTE:

Ignore - A -.

Fig. 102: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose And Bolts

• Loosen bolt - 1 - and pivot left lower coolant pipe up slightly.

NOTE:

Ignore items - 2, 3, 4 -. Be careful of ATF cooler.

Fig. 103: Audi A8 L Quattro 2007 - Component Locations - Loosening Clamping Bolts On Side Of Scissor Lift Table VAS 6131 And Pulling Rear Table Section With Transmission Rearward

• Loosen side clamping bolts - 1 - on scissor lift platform VAS 6131 and pull rear platform top with transmission toward rear - arrow - , while doing this, simultaneously push torque converter off drive plate through opening for removed starter.

Fig. 104: Audi A8 L Quattro 2007 - Component Locations - Securing Torque Converter

• Secure torque converter in transmission with Bracket 30 - 211 A to prevent it from falling down.

Audi A8 L Quattro 2007 - Engine, securing to assembly stand Engine, securing to assembly stand

Fig. 105: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Engine, Securing To Assembly Stand

Special tools, testers and auxiliary items required

• Lifting tackle 3033
• Engine and transmission holder VAS 6095 with bracket VAS 6095/1-6A
• Shop crane VAS 6100

Special tools, testers and auxiliary items required

Fig. 106: Audi A8 L Quattro 2007 - Component Locations - Lift Arm Extension For Workshop Crane VAS 6101

• Lift arm extension for workshop crane VAS 6101

Work procedure

Fig. 107: Audi A8 L Quattro 2007 - Component Locations - Left Engine Mount Electrical Harness Connector & Engine Support Bolts

• Disconnect electrical harness connector - 1 - at left engine mount.
• Remove bolts - arrows - and remove engine support with engine mount.

Fig. 108: Audi A8 L Quattro 2007 - Component Locations - Engaging Lifting Tackle 3033 On Engine Lifting Eyes And On Shop Crane VAS 6100 With Lift Arm Ext./Workshop Hoist VAS 6101

• Engage Lifting Tackle 3033 on engine lifting eyes and on Shop Crane VAS 6100 with Lift Arm Ext./Workshop Hoist VAS 6101 as shown in the illustration.
• Lift engine from support elements of Scissor Lift Table VAS 6131.

Fig. 109: Audi A8 L Quattro 2007 - Component Locations - Securing Engine Using Bracket VAS 6095/1-6A On Engine And Transmission Holder VAS 6095

• Secure engine using bracket VAS 6095/1-6A on Engine and Transmission Holder VAS 6095 as shown in illustration.

Audi A8 L Quattro 2007 - Engine, installing Engine, installing

Torque specifications

NOTE:

Torque specifications only apply to lightly greased, oiled, phosphated or blackened nuts and bolts. Additional lubricants, such as engine or transmission oil are permissible, although lubricants containing graphite are not. Do not use any degreased parts. Tolerance for torque specifications ? 15%.

Tightening torques --> Assembly mount, overview , --> Crankshaft, assembly overview.

Component	Nm
Bolts/nuts	M6	9
M8	20
M10	40
		M12	65
Exceptions:
Drive plate to torque converter	85 1)
High-pressure line	25
1) Replace bolts .

Fig. 110: Audi A8 L Quattro 2007 - Component Locations - Identifying Engine/Transmission Threaded Connections

Securing engine to transmission

Pos.	Bolt	Nm
1	M10x80 1)	65
2	M12x90	65
3	M12x105	65
4, 5	M12x100	65
6	M12x125	65
7	M12x170	65
8, 9, 10	M10x80	45
A	Alignment sleeves for centering
1) Bolt class 10.9.

Work procedure

Installation is in reverse order of removal, note the following:

NOTE:

Replace bolts which have been tightened to torque. Replace self-locking nuts and bolts as well as sealing rings, seals and O-rings. Only replace torque converter bolts with original bolts . Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location. Check whether alignment sleeves for centering engine and transmission in cylinder block are present, insert missing alignment sleeves.

CAUTION:

Risk of destroying ATF pump coupling plate by inserting torque converter incorrectly. Check torque converter installation dimension.

Fig. 111: Audi A8 L Quattro 2007 - Component Locations - Checking Installation Dimension For Torque Converter

When torque converter is installed correctly, distance - a - between contact surface of threaded holes at torque converter and contact surface of bell housing on Automatic Transmission 09E is at least 19 mm.

Fig. 112: Audi A8 L Quattro 2007 - Component Locations - Torque Converter Bolts

• Before guiding engine and transmission together, rotate torque converter and drive plate so that holes and threaded holes are same height as opening on removed starter - arrow -.

CAUTION:

Risk of destroying automatic transmission. Keep checking whether the torque converter behind the drive plate can be turned before and during tightening of the bolts at engine/transmission connection. If the torque converter cannot be turned, it must be assumed that it is inserted incorrectly. Only secure torque converter to drive plate with new original bolts.

• Install ATF lines --> 37 - CONTROLS, HOUSING .

Fig. 113: Audi A8 L Quattro 2007 - Component Locations - Identifying Sealing Ring And O-Ring For Vane Pump

• Before installing an exchanged engine, check whether O-ring - arrow - is inserted in power steering pump input shaft.
• Install starter --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Install engine supports --> Assembly mount, overview.
• Install torque support and torque support bracket --> Assembly mount, overview.

• Install exhaust manifold with catalytic converter: left --> Left exhaust manifold with catalytic converter, removing and installing , right --> Right exhaust manifold with catalytic converter, removing and installing.
• Install right coolant pipe --> Right coolant pipe, removing and installing.
• Install left coolant pipe --> Left coolant pipe, removing and installing.
• Install left lower coolant pipe --> Lower left coolant pipe, removing and installing.

• Insert oil dipstick guide tube with new O-ring in hole in upper part of oil pan.
• Always clean threaded driveshaft bores in transmission flanged shaft of locking fluid residue using a tap before installation.

Fig. 114: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/12 At Left On Transmission

• Turn spindle of left front support element on transmission down.
• Remove left support element base plate from Scissor Lift Table VAS 6131.

Fig. 115: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/11 At Right On Transmission

• Turn spindle of right front support element on transmission down.
• Remove right support element base plate from Scissor Lift Table VAS 6131.
• Place subframe on Scissor Lift Table VAS 6131.

CAUTION:

Risk of falling due to lack of support. After placing subframe, position transmission mounting elements at the front again in the same location.

• Position front transmission mounting elements.

Fig. 116: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 And VAS 6131/12 At Left On Engine

• Turn spindle of left rear support element on engine downward.
• Remove left support element base plate from Scissor Lift Table VAS 6131.

Fig. 117: Audi A8 L Quattro 2007 - Component Locations - Positioning Support Elements From VAS 6131/10 And VAS 6131/12 At Right

• Turn spindle of right rear support element on engine downward.
• Remove right support element base plate from Scissor Lift Table VAS 6131.

NOTE:

The support points for front of engine and transmission remain unchanged.

Fig. 118: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts For Engine Mount At Left/Right

• Install engine carrier - arrows -.

Fig. 119: Audi A8 L Quattro 2007 - Component Locations - Front Transmission Mount Left/Right Bolts

• Place subframe on engine carrier and tighten transmission mount at left and right - arrows - --> 37 - CONTROLS, HOUSING .
• Guide engine/transmission unit with subframe and engine carrier into body from below using scissor lift table VAS 6131.

Fig. 120: Audi A8 L Quattro 2007 - Component Locations - Lowering/Lifting Engine/Transmission Assembly Using Scissor Lift Platform VAS 6131 Only Approx. By Dimension

• Lift engine/transmission subassembly using scissor lift platform VAS 6131 until dimension - a - is reached.

• Dimension - a - = at least 120 mm.

• Install selector lever cable and check adjustment --> 37 - CONTROLS, HOUSING .
• Raise engine/transmission assembly further using Scissor Lift Table VAS 6131.

Fig. 121: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Align subframe according to markings on longitudinal members.
• Tighten subframe bolts only to specified torque, do not tighten further (only tighten bolts after axle alignment) --> 40 - FRONT SUSPENSION .

CAUTION:

Risk of accident due to loose connections. If the bolts in the subframe are not tightened to final torque, vehicle must not be driven.

• Tighten engine carrier bolts - 4 - --> 37 - CONTROLS, HOUSING .

Fig. 122: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts At Tunnel Cross Member

• Tighten bolts - arrows - at tunnel cross member.

The rest of installation is in reverse order of removal, note the following:

• Install drive shaft --> 39 FINAL DRIVE, DIFFERENTIAL .
• Install front muffler: --> Left front muffler, removing and installing , right --> Right front muffler, removing and installing.
• Align exhaust system free of tension --> Exhaust system, installing free of tension.
• Install drive axles --> 40 - FRONT SUSPENSION .

• Install guide control arm, control arm, stabilizer bar, coupling rod and front crossmember --> 40 - FRONT SUSPENSION .
• Install refrigerant lines --> 87 - AIR CONDITIONING .
• Install ATF cooler --> 37 - CONTROLS, HOUSING .
• Install dome brace --> 40 - FRONT SUSPENSION .

• Install torque support bracket --> Torque support bracket, removing and installing.
• Electrical connections and routing --> Electrical Wiring Diagrams, Troubleshooting and Component Locations.
• Observe safety precautions after connecting battery --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Install wiper arms and adjust --> 92 - WINDSHIELD WIPER AND WASHER SYSTEM .

CAUTION:

Risk of destroying control modules with excess voltage. Do not use a battery charger for starting assistance!

• Before starting engine for the first time, fill power steering vacuum reservoir with hydraulic oil --> 48 - STEERING .

NOTE:

Power-steering pump must not run dry.

• Check oil level --> Oil level, checking.
• Fill with coolant --> Filling.

NOTE:

Only reuse drained coolant if cylinder head or engine block was not replaced. Dirty coolant must not be re-used.

• Fill refrigerant circuit Refrigerant R134a - Servicing.
• Perform axle alignment --> 44 - WHEELS, TIRES AND WHEEL ALIGNMENT .

CAUTION:

Risk of accident due to loose connections. Tighten subframe bolts to final torque after axle alignment.

• Check ATF level --> 37 - CONTROLS, HOUSING .

Audi A8 L Quattro 2007 - Assembly mount Assembly mount, overview

Fig. 123: Audi A8 L Quattro 2007 - Component Locations - Assembly Mount, Overview

1 - Torque bracket

2 - Bolt

• 9 Nm

3 - Torque support bearing

• Removing and installing --> Torque support bracket, removing and installing

4 - Bolt

• 23 Nm

5 - Torque support bracket

6 - Bolt

• 40 Nm

7 - Bolt

• 40 Nm

8 - Bolt

• 23 Nm

9 - Bolt

• 68 Nm

10 - Engine carrier

11 - Engine mount, right

• Removing and installing --> Left and right engine mounts, removing and installing

12 - Bolt

• 40 Nm

13 - Right engine support

• Removing and installing --> Left and right engine mounts, removing and installing

14 - Bolt

• 40 Nm

15 - Bolt

• 40 Nm

16 - Bolt

• 40 Nm

17 - Left engine support

• Removing and installing --> Left and right engine mounts, removing and installing

18 - Engine mount, left

• Removing and installing --> Left and right engine mounts, removing and installing

19 - Bolt

• 68 Nm

20 - Bolt

• 23 Nm

21 - Bolt

• 23 Nm

Audi A8 L Quattro 2007 - Left and right engine mounts, removing and installing

Special tools, testers and auxiliary items required

Fig. 124: Audi A8 L Quattro 2007 - Component Locations - Engine Support Bridge 10 - 222 A

• Engine support bridge 10 - 222 A

Fig. 125: Audi A8 L Quattro 2007 - Component Locations - Adapter 10 - 222 A/21

• Adapter 10 - 222 A/21

Fig. 126: Audi A8 L Quattro 2007 - Component Locations - Engine Support Supplement Set T40093

• Engine Support Supplement Set T40093

Removing

Fig. 127: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.

Fig. 128: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - and remove plenum chamber covers - 2 and 3 -.

Fig. 129: Audi A8 L Quattro 2007 - Component Locations - Securing Engine Support Bridge 10 - 222 A With Adapters 10 - 222 A/21 At Suspension Strut Domes

• Remove tower brace rear bolts - 3 -.
• Secure Engine Support Bridge 10 - 222 A/21 with Adapter 10 - 222 A/4 at suspension strut towers.

• Support for left and right side of vehicle is marked.
• The middle contact point - 2 - of support is placed on tower brace front bolts.
• The Adapters 10 - 222 A/21 are secured with tower brace rear bolts - 3 -.
• The knurled thumb screw - 1 - must be turned downward far enough so that the contact plate rests on strut tower.

Fig. 130: Audi A8 L Quattro 2007 - Component Locations - Installing Adapter 10 - 222 A/4 With Adapters T40093/6 On Adapters 10 - 222 A/21 And Secure Spindles 10 - 222 A/11 At Engine Lifting Eyes

• Install Adapter 10 - 222 A/4 with adapters T40093/6 on adapters 10 - 222 A/21.
• Secure spindles 10 - 222 A/11 at engine lifting eyes.
• Lightly tension engine with engine support bridge spindles.

Fig. 131: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

Fig. 132: Audi A8 L Quattro 2007 - Component Locations - Left/Right Stabilizer Bar Mount Bolts

• Remove left and right stabilizer bar mount bolts - 1 and 2 -.
• Slightly lower stabilizer bar.

Fig. 133: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Remove bolts - 3 and 4 -.

NOTE:

Ignore items - 1 and 2 -.

Fig. 134: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts For Engine Mount At Left/Right

• Remove engine bracket bolts at left and right - arrows -.
• Remove engine carrier.

Left engine mount:

Fig. 135: Audi A8 L Quattro 2007 - Component Locations - Left Engine Mount Electrical Harness Connector & Engine Support Bolts

• Disconnect electrical connector - 1 - on engine mount.
• Remove bolts - arrows - and remove engine support with engine mount.

Right engine mount:

Fig. 136: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) Air Guide Hose & Bolts

• Free up secondary air injection (AIR) air guide hose - 1 - on ATF cooler bracket.
• Remove bolts - arrows - and remove ATF cooler.
• Secure ATF cooler with connected coolant hoses to engine.

Fig. 137: Audi A8 L Quattro 2007 - Component Locations - Right Engine Mount Electrical Harness Connector, Right Engine Support Electrical Wiring Bracket & Engine Support With Engine Mount Bolts

• Disconnect electrical harness connector - 2 - at right engine mount.
• Remove electrical wiring bracket - 1 - from right engine support.
• Remove bolts - arrows - and remove engine support with engine mount.

Continued for both sides:

Fig. 138: Audi A8 L Quattro 2007 - Component Locations - Engine Mount & Bolt

• Remove bolt - arrow - and remove engine mount from engine support.

Installing

• Tightening torques --> Assembly mount, overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace bolts which have been tightened to torque. During installation, all cable ties must be re-installed at the same location.

• Install subframe --> 40 - FRONT SUSPENSION .
• Install stabilizer bar --> 40 - FRONT SUSPENSION .
• Install ATF cooler --> 37 - CONTROLS, HOUSING .
• Install dome brace --> 40 - FRONT SUSPENSION .

Audi A8 L Quattro 2007 - Torque support bracket, removing and installing

Special tools, testers and auxiliary items required

• Drill
• Stepped quick-helix drill (dia. 24 mm)

Removing

Fig. 139: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

• Remove both front wheels.
• Remove front part of left and right front wheel housing liner --> 66 - EXTERIOR EQUIPMENT .
• Remove front bumper cover --> 63 - BUMPERS .

Fig. 140: Audi A8 L Quattro 2007 - Component Locations - Lower Air Guide Hose

• Remove lower air guide hose from lower part of air filter housing - arrow -.
• Remove right headlight --> 94 - LIGHTS, SWITCHES - EXTERIOR .

Fig. 141: Audi A8 L Quattro 2007 - Component Locations - Mass Air Flow (MAF) Sensor G70 Electrical Harness Connector, Air Guide Hose, Air Duct & Bolts

• Disconnect electrical harness connector - 3 - at Mass Air Flow (MAF) Sensor G70.
• Disconnect air guide hose - 2 - from air guide pipe.
• Disconnect air duct - 1 - from upper part of air filter housing.
• Remove bolts - arrows - and remove upper part of air filter housing.

Fig. 142: Audi A8 L Quattro 2007 - Component Locations - Vacuum Hose, Air Duct, Bolts & Intake Air Switch-Over Valve N335 Electrical Connector

• Disconnect vacuum hose - 1 - and remove air duct - 2 -.
• Remove bolts - arrows -.
• Rotate lower part of air filter housing and disconnect electrical connector - 3 - on Intake Air Switch-Over valve N335.
• Remove lower part of air filter housing.

Fig. 143: Audi A8 L Quattro 2007 - Component Locations - Depressing Locking Mechanisms And Removing Air Guide At Right Front From Lock Carrier

• Depress locking mechanisms - arrows - and remove air guide at right front from lock carrier.

Fig. 144: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts And Air Guide

• Remove bolts - arrows -.
• Remove air guide at right rear from lock carrier.

Fig. 145: Audi A8 L Quattro 2007 - Component Locations - Marking Holes According To Dimensions At Lock Carrier

• Mark holes according to dimensions - a and b - at lock carrier as shown.

• Dimension - a - = 40 mm.
• Dimension - b - = 55 mm

• Make a bore dia. 24 mm.

NOTE:

The bore must be pre-bored and then drilled to dia. 24 mm using stepped quick-helix drill.

Fig. 146: Audi A8 L Quattro 2007 - Component Locations - Torque Support Bracket Bolts

• Remove bolts - 1 and 2 - on torque support bracket.
• Loosen bolt - 3 - several turns.

Fig. 147: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolt

• Remove bolt - arrow - at torque support mount.

Fig. 148: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolts

• Remove bolts - arrows - and remove torque support mount.

Installing

Fig. 149: Audi A8 L Quattro 2007 - Component Locations - Turning Adjustment Ring On Torque Support Bracket Clockwise

• Turn adjustment ring - 1 - on torque support bracket clockwise - arrow - as far as stop.

Fig. 150: Audi A8 L Quattro 2007 - Component Locations - Torque Support Bracket Bolts

• Tighten bolts - 1 and 3 - on torque support bracket.

Fig. 151: Audi A8 L Quattro 2007 - Component Locations - Turning Adjustment Ring On Torque Support Bracket Clockwise

• Rotate adjustment ring - 1 - counter-clockwise - arrow - by hand until it comes into contact with torque support bracket.
• Then, turn adjustment ring one rotation clockwise again.

Fig. 152: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolt

• Tighten bolt - arrow - on torque support mount.

The rest of installation is in reverse order of removal, note the following.

• Install headlamps --> 94 - LIGHTS, SWITCHES - EXTERIOR .
• Install the front bumper cover --> 63 - BUMPERS .
• Install air filter housing --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Check headlight adjustment 404.

Audi A8 L Quattro 2007 - 13 - Engine - Crankshaft, Cylinder Block Cylinder block, belt pulley side Ribbed belt drive, assembly overview

Fig. 153: Audi A8 L Quattro 2007 - Component Locations - Ribbed Belt Drive, Assembly Overview

1 - Bolt

• 22 Nm

2 - Bolt

• 55 Nm

3 - Tensioning device for ribbed belt

4 - Ribbed belt

• Check for wear
• Do not kink

CAUTION:

Risk of destroying due to reversed running direction on a used ribbed belt. Before removing ribbed belt, marking running direction with chalk or felt-tip pen for reinstallation later.

• Removing and installing --> Ribbed belt, removing and installing
• When installing, make sure it is seated correctly on pulleys

5 - Cover cap

6 - Bolt

• 22 Nm

7 - Generator

• Removing and installing --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL

8 - Bolt

• M8: 22 Nm
• M10: 46 Nm

9 - Alignment bushing

• For Generator bracket
• 2 pieces

10 - Generator bracket

11 - Bolt

• 9 Nm

12 - Bracket

• For idler pulley

13 - Idler roller for ribbed belt

14 - Bolt

• 22 Nm

15 - Vibration damper

• Removing and installing --> Vibration damper, removing and installing

16 - Bolt

• Replace
• Tightening order --> Vibration damper tightening sequence

17 - Alignment bushing

• 2 pieces

18 - Bracket

• For ribbed belt tensioner

19 - Bolt

• Different lengths
• 9 Nm

Audi A8 L Quattro 2007 - Vibration damper tightening sequence

Fig. 154: Audi A8 L Quattro 2007 - Component Locations - Vibration Damper Bolts

• Tighten bolts - arrow - in diagonal sequence in 3 stages as follows:
• Tighten bolts to 15 Nm.
• Tighten bolts to 22 Nm.
• Tighten an additional 90? (¹ /₄ turn).

Audi A8 L Quattro 2007 - Ribbed belt, removing and installing

Removing

Fig. 155: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

Fig. 156: Audi A8 L Quattro 2007 - Component Locations - ATF Cooler From Coolant Hoses

• Remove bolts - arrows - and remove coolant pipes to ATF cooler with coolant hoses - 1 through 4 - connected from lock carrier.

CAUTION:

Risk of destroying due to reversed running direction on a used ribbed belt. Before removing ribbed belt, marking running direction with chalk or felt-tip pen for reinstallation later.

Fig. 157: Audi A8 L Quattro 2007 - Component Locations - Releasing Ribbed Belt Tension

• Pivot tensioning device in direction of - arrow - to relieve tension on ribbed belt.
• Remove ribbed belt and release tensioning device.

Installing

Installation is in reverse order of removal, note the following:

Fig. 158: Audi A8 L Quattro 2007 - Component Locations - Placing Ribbed Belt Over Belt Pulley In Specified Sequence

• Route ribbed belt - 2 - over belt pulley in specified sequence.

1 - Generator

3 - Idler roller

4 - Vibration damper

5 - Tensioning roller

NOTE:

When installing the ribbed belt, make sure it is seated correctly on pulleys.

• Start engine and check running belt.

Audi A8 L Quattro 2007 - Vibration damper, removing and installing

Removing

Fig. 159: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

Fig. 160: Audi A8 L Quattro 2007 - Component Locations - ATF Cooler From Coolant Hoses

• Remove bolts - arrows - and remove coolant pipes to ATF cooler with coolant hoses - 1 through 4 - connected from lock carrier.

Fig. 161: Audi A8 L Quattro 2007 - Component Locations - Vibration Damper Bolts

• Loosen 8 bolts - arrow - on vibration damper several turns by counterholding on generator belt pulley centered nut with open end wrench.
• Remove ribbed belt --> Ribbed belt, removing and installing
• Remove bolts - arrows - and remove vibration damper.

Installing

• Tightening torque --> Vibration damper tightening sequence

Installation is in reverse order of removal, note the following:

NOTE:

Replace bolts which have been tightened to torque. Installation of harmonic balancer is only possible in one position - note alignment bushing.

• Install ribbed belt --> Ribbed belt, removing and installing.

Audi A8 L Quattro 2007 - Crankshaft seal, ribbed belt side, replacing

Special tools, testers and auxiliary items required

Fig. 162: Audi A8 L Quattro 2007 - Component Locations - Seal Remover T40019

• Seal remover T40019

Fig. 163: Audi A8 L Quattro 2007 - Component Locations - Assembly Tool T40048

• Assembly tool T40048

Work procedure

• Remove vibration damper --> Vibration damper, removing and installing.

Fig. 164: Audi A8 L Quattro 2007 - Component Locations - Installing Oil Seal Extractor T40019

• Position inner part of Oil Seal Extractor T40019 flush with outer part and secure inner part with knurled thumb screw.
• Lubricate threaded head of seal remover, place against seal, and with strong force install seal as far as possible.
• Loosen knurled screw and turn inner portion against crankshaft until oil seal is pulled out.
• Clamp seal extractor at mounting points in a vise.

• Remove seal using pliers.
• Clean operating and sealing surfaces.

Fig. 165: Audi A8 L Quattro 2007 - Component Locations - Inserting Assembly Device T40048/1 Onto Pull Sleeve T40048/2 And Sliding Seal Onto Pull Sleeve

• Position assembly device T40048/1 on pull sleeve T40048/2 and slide seal - A - onto pull sleeve.
• Remove assembly device.

Fig. 166: Audi A8 L Quattro 2007 - Component Locations - Placing Pull Sleeve T40048/2 On Crankshaft And Sliding Seal Into Sealing Surface On Engine

• Place pull sleeve T40048/2 on crankshaft and slide seal - 1 - into sealing surface on cylinder block.

NOTE:

Pull sleeve remains on crankshaft for pressing in.

Fig. 167: Audi A8 L Quattro 2007 - Component Locations - Positioning Pressure Sleeve T40048/3 With Bolts On Crankshaft

• Position pressure sleeve T40048/3 with 2 M8x55 mm bolts - arrows - on crankshaft.
• Then install bolts by hand.
• Tighten bolts each ¹ /₂ rotation by alternating sides to press in seal until it reaches stop.

The rest of installation is in reverse order of removal, note the following:

• Install vibration damper --> Vibration damper, removing and installing.
• Install ribbed belt --> Ribbed belt, removing and installing.

Audi A8 L Quattro 2007 - Cylinder block, transmission side Cylinder block, transmission side

NOTE:

To perform assembly work, secure engine with V8 FSI engine holder 6095/1-6A to Engine and Transmission Holder VAS 6095 --> Engine, securing to assembly stand.

Audi A8 L Quattro 2007 - Drive plate, assembly overview

Fig. 168: Audi A8 L Quattro 2007 - Component Locations - Drive Plate, Assembly Overview

1 - Drive plate

• Removing and installing --> Drive plate, removing and installing
• Mark for re-installation

2 - Bolt

• Replace
• 60 Nm plus an additional 90? (¹ /₄ turn).

3 - Shim

• Mark for re-installation

4 - Transmission-side crankshaft sealing ring

• Replacing --> Transmission-side crankshaft sealing ring, replacing.

5 - Crankshaft

Audi A8 L Quattro 2007 - Drive plate, removing and installing

Special tools, testers and auxiliary items required

Fig. 169: Audi A8 L Quattro 2007 - Component Locations - Counter-Holder Tool 10 - 201

• Counter-holder tool 10 - 201

Removing

• Engine or transmission removed.

Fig. 170: Audi A8 L Quattro 2007 - Component Locations - Inserting Counter Hold Tool 10-201 To Loosen Bolts

• Insert counterhold tool 10 - 201 to loosen bolts.
• Identify position of drive plate to crankshaft with a felt-tip pen for reinstallation.
• Remove drive plate.
• Remove shim from behind it.

Installing

• Tightening torque --> Drive plate, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace bolts which have been tightened to torque.

• Install drive plate with shim.
• Turn over counterhold tool 10 - 201 to tighten bolts.

Audi A8 L Quattro 2007 - Transmission-side crankshaft sealing ring, replacing

Special tools, testers and auxiliary items required

Fig. 171: Audi A8 L Quattro 2007 - Component Locations - Pulling Fixture T10122

• Pulling fixture T10122

Fig. 172: Audi A8 L Quattro 2007 - Component Locations - Extractor Hook T20143

• Extractor hook T20143

Work procedure

• Engine or transmission removed.

• Remove drive plate --> Drive plate, removing and installing.

Fig. 173: Audi A8 L Quattro 2007 - Component Locations - Prying Out Sealing Ring Using Extractor Lever T20143/2

• Pry out sealing ring using pulling hook T20143/2.
• Clean operating and sealing surfaces.

Fig. 174: Audi A8 L Quattro 2007 - Component Locations - Inserting Assembly Device T10122/1 Onto Pull Sleeve T10122/2 And Sliding Seal Onto Pull Sleeve

• Insert assembly device T10122/1 onto pull sleeve T10122/2 and slide sealing ring - A - onto pull sleeve.
• Remove assembly device.

Fig. 175: Audi A8 L Quattro 2007 - Component Locations - Installing Pull Sleeve T10122/2 With Sealing Ring Onto Crankshaft

• Install pull sleeve T10122/2 with seal - 1 - on crankshaft.

Fig. 176: Audi A8 L Quattro 2007 - Component Locations - Thrust Piece T10122/3

• Press seal evenly and flush all around with thrust piece T10122/3.

The rest of installation is in reverse order of removal, note the following:

• Install drive plate --> Drive plate, removing and installing.

Audi A8 L Quattro 2007 - Crankshaft Crankshaft

NOTE:

To perform assembly work, secure engine with V8 FSI engine holder 6095/1-6A to Engine and Transmission Holder VAS 6095 --> Engine, securing to assembly stand.

Audi A8 L Quattro 2007 - Crankshaft, assembly overview

Fig. 177: Audi A8 L Quattro 2007 - Component Locations - Crankshaft, Assembly Overview

1 - Cylinder block

• Paired to - 12 -
• Sealant applied on cylinder block (for guide frame) Sealant applied on cylinder block (for guide frame)

2 - Seals

• Replace

3 - Crankshaft seal, ribbed belt side

• Replacing --> Crankshaft seal, ribbed belt side, replacing.

4 - Alignment bushing

• 2 pieces
• Insert into guide frame
• Installed location --> Sealant applied on cylinder block (for guide frame)

5 - Bolt

• 9 Nm

6 - Guide tube for oil dipstick

7 - O-ring

• Replace

8 - Bolts

• For guide frame
• Replace
• Various bolt sizes
• Tightening order --> Guide frame tightening sequence

9 - Baffle plate

10 - Bolt

• Tightening order --> Baffle plate tightening sequence

11 - Bolt

• For guide frame to cylinder block sealing surfaces
• Different bolt lengths
• Tightening order --> Guide frame tightening sequence

12 - Bearing bracket

• Paired to - 1 -
• Sealant applied on cylinder block (for guide frame) --> Sealant applied on cylinder block (for guide frame)
• Bolt tightening sequence --> Guide frame tightening sequence

13 - Thrust washer

• Only at 4th crankshaft bearing
• Lubricating grooves face outward
• Note locating point in guide frame
• Measuring crankshaft axial clearance --> Axial clearance, measuring

14 - Bearing shell

• For guide frame without lubricating groove
• Mark used bearing shells
• Insert new bearing shells for guide frame with proper color marking

• New crankshafts --> Allocation of main bearing shells for new crankshafts
• Used and reworked crankshafts --> Allocation of main bearing shells for used and reworked crankshafts

15 - Crankshaft

• Measuring axial play --> Axial clearance, measuring
• Radial clearance, measuring --> Radial clearance, measuring
• Do not turn crankshaft when measuring radial play
• Crankshaft dimensions --> Crankshaft dimensions

16 - Thrust washer

• Only at 4th crankshaft bearing
• Lubricating grooves face outward
• Measuring crankshaft axial clearance --> Axial clearance, measuring

17 - Bearing shell

• For cylinder block with oil groove
• Mark used bearing shells
• Insert new bearing shells for cylinder block with proper color marking

• New crankshafts --> Allocation of main bearing shells for new crankshafts
• Used and reworked crankshafts --> Allocation of main bearing shells for used and reworked crankshafts

18 - Seals

• Replace

Audi A8 L Quattro 2007 - Baffle plate tightening sequence

Fig. 178: Audi A8 L Quattro 2007 - Component Locations - Baffle Plate Tightening Sequence

• Tighten bolts - 1 to 16 - in sequence.

• 9 Nm

Audi A8 L Quattro 2007 - Sealant applied on cylinder block (for guide frame)

Fig. 179: Audi A8 L Quattro 2007 - Component Locations - Sealant Applied On Cylinder Block (For Guide Frame)

• Clean sealing surfaces so they are completely free of any oil or grease.
• Apply sealant beads - arrows - to clean sealing surfaces as shown in illustration.

• Thickness of sealant beads: 2.0 mm.

• Install seals - 1 to 4 -.

Fig. 180: Audi A8 L Quattro 2007 - Component Locations - Installation Position Of Alignment Bushings

Installation position of alignment bushings

• Check whether alignment bushings - arrows - are inserted at locations in guide frame as shown in the illustration.

Audi A8 L Quattro 2007 - Guide frame tightening sequence

Fig. 181: Audi A8 L Quattro 2007 - Component Locations - Guide Frame Tightening Sequence

• Replace bolts - 1 to 20 -.
• Tighten bolts as follows:
• Tighten bolts - 1 to 10 - to 30 Nm.
• Tighten bolts - 11 to 20 - to 20 Nm.

• Tighten bolts - 1 to 10 - to 50 Nm.
• Tighten bolts - 11 to 20 - to 30 Nm.
• Tighten bolts - 1 to 10 - an additional 90? (¹ /₄ turn).
• Tighten bolts - 11 to 20 - an additional 90? (¹ /₄ turn).

• Tighten guide frame to cylinder block sealing surface bolts, - highlighted in illustration but not numbered - , in a diagonal sequence to 9 Nm.

Audi A8 L Quattro 2007 - Allocation of main bearing shells for new crankshafts Allocation of crankshaft bearing shells for cylinder block

Fig. 182: Audi A8 L Quattro 2007 - Component Locations - Allocation Of Crankshaft Bearing Shells For Cylinder Block

• Bearing shells with correct thickness are allocated to the cylinder block in the factory. Colored dots on sides of bearing shells serve for identifying bearing shell thickness.
• Allocation of bearing shells to cylinder block is marked by one letter each at front left on cylinder block (can be read from outside) as shown in the illustration.

Letter on cylinder block	Color of bearing
R	=	Red
G	=	Yellow
B	=	Blue

NOTE:

In addition, the letters are also stamped on the guide frame.

Audi A8 L Quattro 2007 - Allocation of crankshaft bearing shells for guide frame - Version I

Fig. 183: Audi A8 L Quattro 2007 - Component Locations - Allocation Of Crankshaft Bearing Shells For Guide Frame - Version I

• Bearing shells with the correct thickness are allocated to the guide frame in the factory. Colored dots on sides of bearing shells serve for identifying bearing shell thickness.
• Allocation of bearing shells to guide frame is marked by one colored dot each on crankshaft counterweight as shown in the illustration.

Colored dot on crankshaft	Color of bearing
Red	Red
Yellow	Yellow
Blue	Blue

Audi A8 L Quattro 2007 - Allocation of crankshaft bearing shells for guide frame - Version II

Fig. 184: Audi A8 L Quattro 2007 - Component Locations - Allocation Of Crankshaft Bearing Shells For Guide Frame - Version II

• Bearing shells with correct thickness are allocated to the guide frame in the factory. Colored dots on sides of bearing shells serve for identifying bearing shell thickness.
• The allocation of bearing shells to guide frame is identified by a letter on front crankshaft counterweight, as shown in the illustration. The "X" marks the end of the letter sequence and is near the bearing 1 color identification on the belt pulley side.

NOTE:

Ignore - A -.

Letter on crankshaft	Color of bearing
R	=	Red
G	=	Yellow
B	=	Blue

Audi A8 L Quattro 2007 - Allocation of main bearing shells for used and reworked crankshafts Allocation of crankshaft bearing shells for cylinder block

Fig. 185: Audi A8 L Quattro 2007 - Component Locations - Allocation Of Crankshaft Bearing Shells For Cylinder Block

• Bearing shells are allocated to cylinder block corresponding to color markings stamped into cylinder block.
• For used and reworked crankshafts, the main crankshaft journals must be measured in order to allocate the matching bearing shells.
• Crankshaft dimensions --> Crankshaft dimensions.
• Thicker over-sized bearing shells are available for reworked crankshafts. These have the same color markings as the original-size bearing shells.

Letter on cylinder block	Color of bearing
R	=	Red
G	=	Yellow
B	=	Blue

Audi A8 L Quattro 2007 - Allocation of crankshaft bearing shells for guide frame

• For used and reworked crankshafts, the main crankshaft journals must be measured in order to allocate the matching bearing shells.
• Any other markings on the crankshaft are invalid when reworking crankshafts.
• Allocate bearing shells to the determined diameter of main crankshaft journals according to the following table.

Main crankshaft journals diameter	Color identification of bearing shells for guide frame
Dimensions in mm	Red	Yellow	Blue
Basic dimension 65.000 1)	64.978 to 64.972	64.972 to 64.965	64.965 to 64.958
Repair stage 64.750 1)	64.728 to 64.722	64.722 to 64.715	64.715 to 64.708
1) The same color marking is valid for the thicker over-sized bearing for reworked crankshafts as for new crankshafts despite the greater bearing thickness.

Audi A8 L Quattro 2007 - Crankshaft dimensions

Reconditioning dimension in mm	Main crankshaft journals diameter	Connecting rod pins diameter
Basic dimension	65.000	0.022 0.042	54.000	0.022 0.042
Repair stage	64.750	0.022 0.042	53.750	0.022 0.042

Audi A8 L Quattro 2007 - Axial clearance, measuring

Special tools, testers and auxiliary items required

Fig. 186: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge Holder VW 387

• Dial gauge holder VW 387

Fig. 187: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge VAS 6079

• Dial gauge VAS 6079

Work procedure

Fig. 188: Audi A8 L Quattro 2007 - Component Locations - Securing Dial Gauge VAS 6079 With Dial Gauge Holder VW 387 To Cylinder Block

• Secure Dial Gauge VAS 6079 with Dial Gauge Holder VW 387 to cylinder block as shown in illustration.
• Position dial gauge against crankshaft counterweight.
• Press crankshaft by hand against gauge and set gauge to "0".
• Press crankshaft off gauge and read value.

• Axial clearance: 0.090 to 0.251 mm.

Audi A8 L Quattro 2007 - Radial clearance, measuring

Special tools, testers and auxiliary items required

• Plastigage

Work procedure

NOTE:

Identify used bearing for reinstallation. If the bearing shells are worn down to the nickel layer, they must be replaced.

• Remove guide frame and clean journals.
• Place Plastigage over entire width of bearing journal or into bearing shells.

• Plastigage must rest in center of bearing shell.

• Install guide frame and tighten to 30 Nm. Do not turn crankshaft.
• Remove guide frame again.
• Compare width of Plastigage with measuring scale.

Radial clearance:

• New: 0.017 to 0.044 mm.
• Wear limit: 0.08 mm.

Audi A8 L Quattro 2007 - Piston and connecting rod Piston and connecting rod, assembly overview

NOTE:

Oil injector jet for piston cooling --> Oil spray jet for piston cooling

Fig. 189: Audi A8 L Quattro 2007 - Component Locations - Piston And Connecting Rod, Assembly Overview

1 - Bolt

• Replace
• Lubricate threads and contact surface
• 60 Nm plus an additional 90? (¹ /₄ turn).
• Tighten to 60 Nm to measure radial play, do not turn further

2 - Connecting rod bearing cap

• Mark for re-installation
• Mark affiliation to cylinder with paint --> Mark connecting rod
• Installation position of connecting rod pairs --> Connecting rod, installed location

3 - Bearing shells

• Check that retaining tabs are secured
• Mark used bearing shells for reinstallation but not on running surface
• Radial clearance, measuring --> Radial clearance of connecting rod, measuring
• Over-sized bearings are available for reworked crankshaft connecting rod journals

4 - Connecting rod

• Only replace as set
• Mark affiliation to cylinder with paint --> Mark connecting rod
• Installation position of connecting rod pairs --> Connecting rod, installed location
• Axial play for each new connecting rod pair: 0.20 to 0.27 mm

• Axial play wear limit: 0.30 mm
• Radial clearance, measuring --> Radial clearance of connecting rod, measuring

5 - Piston pin

• If tight, heat piston to 60? C
• Removing and installing using a drift VW 222 A

6 - Circlip

7 - Piston

• Installation position of pistons --> Piston installation position
• Piston and cylinder dimensions --> Piston and cylinder dimensions
• Checking --> Checking piston
• Install with piston ring compressor

• Measuring cylinder bore --> Measuring cylinder bore

8 - Piston rings

• Offset gaps by 120?
• Use piston ring pliers for removal and installation
• "TOP" marking or inscribed side must point to piston head
• Gap, measuring --> Piston ring end gap, measuring

• Measuring side clearance --> Measuring piston ring side clearance

Audi A8 L Quattro 2007 - Piston ring end gap, measuring

Fig. 190: Audi A8 L Quattro 2007 - Component Locations - Piston Ring End Gap, Measuring

• Slide piston ring down from above at a right angle to cylinder wall until it is approx. 15 mm from bottom edge of cylinder.
• When sliding in, use a piston without piston rings.

Piston ring dimensions in mm	New	Wear limit
1. Compression ring	0.20 to 0.35	0.80
2. Compression ring	0.20 to 0.40	0.80
Oil scraping ring	0.20 to 0.40	0.80

Audi A8 L Quattro 2007 - Measuring piston ring side clearance

Fig. 191: Audi A8 L Quattro 2007 - Component Locations - Measuring Piston Ring Side Clearance

• Clean ring groove of piston before checking.

Piston ring dimensions in mm	New	Wear limit
1. Compression ring	0.035 to 0.085	0.200
2. Compression ring	0.005 to 0.045	0.150
Oil scraping ring	0.010 to 0.050	0.200

Audi A8 L Quattro 2007 - Checking piston

Fig. 192: Audi A8 L Quattro 2007 - Component Locations - Checking Piston

• Measure approx. 15 mm from lower edge, at a 90? angle to piston pin axis using an external micrometer 75 to 100 mm.

• Maximum deviation from nominal dimension: 0.03 mm.

Nominal dimension --> Piston and cylinder dimensions.

Audi A8 L Quattro 2007 - Measuring cylinder bore

Fig. 193: Audi A8 L Quattro 2007 - Component Locations - Measuring Cylinder Bore

• Using an internal dial gauge 50 to 100 mm, measure at 3 points in diagonal sequence horizontally - A - and vertically - B -.

• Maximum deviation from nominal dimension: 0.08 mm.

Nominal dimension --> Piston and cylinder dimensions.

Audi A8 L Quattro 2007 - Piston installation position

Fig. 194: Audi A8 L Quattro 2007 - Component Locations - Piston Installation Position

• Mark allocation to cylinder with pen on piston crown for reinstallation.

NOTE:

Do not use a center punch or scribe, since the piston head coating will be damaged.

Installed location:

• Arrows on piston heads point to belt pulley side.
• Large valve recesses - 1 - point toward center of engine.

Audi A8 L Quattro 2007 - Mark connecting rod

Fig. 195: Audi A8 L Quattro 2007 - Component Locations - Marking Connecting Rod

NOTE:

Only replace connecting rod as a set.

• Mark connecting rod and connecting rod bearing cap to each other and to cylinder - arrow - with pen for reinstallation.

Audi A8 L Quattro 2007 - Connecting rod, installed location

Fig. 196: Audi A8 L Quattro 2007 - Component Locations - Connecting Rod, Installed Location

• Molded tabs - arrows - at the beveled surfaces of the connecting rod pairs 1 and 2, 3 and 4, 5 and 6 as well as 7 and 8 must point toward each other.

Audi A8 L Quattro 2007 - Oil spray jet for piston cooling

Fig. 197: Audi A8 L Quattro 2007 - Component Locations - Oil Spray Jet For Piston Cooling

1. Oil spray jet
2. Bolts - 9 Nm. Insert with locking compound

NOTE:

Do not bend piston spray nozzles. Bend piston spray nozzles must be replaced.

Audi A8 L Quattro 2007 - Piston and cylinder dimensions

Matching pistons are allocated to the different manufacturing stages of the cylinder block.

Cylinder bore diameter mm	Piston diameter mm
84.510 ? 0.005	84.490 1)
84.610 ? 0.005	84.590 1)
1) Measurement with graphite coating (thickness = 0.01 mm). The graphite coating wears off.

Audi A8 L Quattro 2007 - Radial clearance of connecting rod, measuring

Special tools, testers and auxiliary items required

• Plastigage

Work procedure

• Remove connecting rod bearing caps.
• Clean bearing caps and journals.
• Place Plastigage over entire width of bearing journal or into bearing shells.
• Install connecting rod bearing cap and tighten to 60 Nm. Do not turn crankshaft.

• Remove connecting rod bearing caps again.
• Compare width of Plastigage with measuring scale.

Radial clearance:

• New: 0.020 to 0.069 mm.
• Wear limit: 0.120 mm.

• Replace connecting rod bolts.

Audi A8 L Quattro 2007 - 15 - Engine - Cylinder head, Valvetrain Cylinder head Cylinder head, assembly overview

NOTE:

Cylinder head for cylinder bank 2 (left) is shown in illustration.

Fig. 198: Audi A8 L Quattro 2007 - Component Locations - Cylinder Head, Assembly Overview

1 - Cylinder head gasket

• Replacing --> Cylinder head, removing and installing.
• Installed location: Part Number, points to cylinder head
• After replacing, change engine oil and coolant

2 - Cylinder head

• Removing and installing --> Cylinder head, removing and installing
• Check for distortion --> Checking cylinder head for distortion
• Reworking dimension
• After replacing, change engine oil and coolant

3 - Cylinder head cover gasket

• Replace if damaged or leaking

4 - Cylinder head cover

• Removing and installing: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing

5 - Gasket

• For cap
• Replace if damaged or leaking

6 - Cap

7 - Ignition coil

• Remove with Puller T40039

8 - Bolt

• Replace if seal is damaged
• Left cylinder head cover tightening sequence --> Left cylinder head cover tightening sequence
• Right cylinder head cover tightening sequence --> Right cylinder head cover tightening sequence

9 - Camshaft Adjustment Valve 2 N208

10 - Bolt

• 2.4 Nm

11 - O-ring

• Replace

12 - Seal

• Replace

13 - Locking bolt

• 35 Nm

14 - Bolt

• 2.4 Nm

15 - Camshaft Adjustment Valve 2 (exhaust) N319

16 - O-ring

• Replace

17 - Bolt

• Replace
• Observe sequence for loosening --> Fig. 224
• Tightening order --> Cylinder head tightening sequence

Audi A8 L Quattro 2007 - Left cylinder head cover tightening sequence

Fig. 199: Audi A8 L Quattro 2007 - Component Locations - Left Cylinder Head Cover Bolts Removal Sequence

• Tighten bolts - 1 to 15 - in sequence.

• 9 Nm

Audi A8 L Quattro 2007 - Right cylinder head cover tightening sequence

Fig. 200: Audi A8 L Quattro 2007 - Component Locations - Right Cylinder Head Cover Bolts Removal/Tightening Sequence

• Tighten bolts - 1 to 16 - in sequence.

• 9 Nm

Audi A8 L Quattro 2007 - Cylinder head tightening sequence

Fig. 201: Audi A8 L Quattro 2007 - Component Locations - Cylinder Head Tightening Sequence

• Tighten bolts in 5 stages - 1 to 5 - in sequence as follows:
• Insert bolts by hand as far as stop.
• Tighten bolts to 30 Nm.
• Tighten bolts to 60 Nm.

• Tighten an additional 90? (¹ /₄ turn).
• Tighten an additional 90? (¹ /₄ turn).
• Insert bolts - arrows - with locking compound and tighten to 8 Nm; Locking compound .
• Tighten bolts - arrows - an additional 90? (¹ /₄ turn).

Audi A8 L Quattro 2007 - Checking cylinder head for distortion

Fig. 202: Audi A8 L Quattro 2007 - Component Locations - Checking Cylinder Head For Distortion

• Check cylinder head at multiple points for distortion, using straight edge and feeler gauges.

• Maximum permissible warpage: 0.1 mm.

Audi A8 L Quattro 2007 - Reworking dimension, cylinder head

Fig. 203: Audi A8 L Quattro 2007 - Component Locations - Reworking Dimension, Cylinder Head

Resurfacing cylinder head (face grinding) is only permissible to minimum dimension - a -.

• Minimum dimension: - a - = 139.5 mm.

Audi A8 L Quattro 2007 - Left cylinder head cover, removing and installing

Special tools, testers and auxiliary items required

Fig. 204: Audi A8 L Quattro 2007 - Component Locations - Puller T40039

• Puller T40039

Removing

Fig. 205: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Dipstick, Bolts, Electrical Connectors, And Ventilation Hose

• Remove oil dipstick - 10 - from guide tube.
• Remove bolts - 2 and 5 -.
• Disconnect electrical connectors - 1, 3, 4, 6, 8, 9 - and free up wiring harness.
• Remove crankcase ventilation hose - 7 - by pressing release buttons.

Fig. 206: Audi A8 L Quattro 2007 - Component Locations - Removing Ignition Coils Using Ignition Coil Puller T40039

• Remove ignition coils using ignition coil puller T40039.

Fig. 207: Audi A8 L Quattro 2007 - Component Locations - Left Cylinder Head Cover Bolts Removal Sequence

• Remove left cylinder head cover bolts in sequence - 15 to 1 -.
• Remove cylinder head cover.

Installing

• Tightening torque --> Left cylinder head cover tightening sequence.

Installation is in reverse order of removal, note the following:

NOTE:

Replace cylinder head cover if damaged or leaking. Replace bolts for cylinder head cover if gasket is damaged.

• Clean sealing surfaces so they are completely free of any oil or grease.
• Tighten cylinder head cover bolts --> Left cylinder head cover tightening sequence

Audi A8 L Quattro 2007 - Right cylinder head cover, removing and installing

Special tools, testers and auxiliary items required

Fig. 208: Audi A8 L Quattro 2007 - Component Locations - Puller T40039

• Puller T40039

Removing

• Free up fuel line and line to EVAP canister on air guide pipe.

Fig. 209: Audi A8 L Quattro 2007 - Component Locations - Identifying Vacuum Line, Air Guide Hose, Crankcase Ventilation Hose & Hose Clamps

• Disconnect electrical harness connector - 1 - at Mass Air Flow (MAF) Sensor G70.
• Remove vacuum line - 4 - to air guide hose from suction jet pump.

CAUTION:

Risk of violating emissions legislation. Do not open hose connection - 3 - !

• Lay aside air guide hose with connected crankcase ventilation hose - 3 - by loosening hose clamps - 2 and 5 -.

Fig. 210: Audi A8 L Quattro 2007 - Component Locations - Mass Air Flow (MAF) Sensor G70 Electrical Harness Connector, Air Guide Hose, Air Duct & Bolts

• Disconnect air duct - 1 - from upper part of air filter housing.
• Remove bolts - arrows - and remove upper part of air filter housing.

NOTE:

Ignore items - 2 and 3 -.

Fig. 211: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts On Right Cylinder Head & Disconnecting Electrical Connectors

• Remove bolts - 3 and 6 - on right cylinder head.
• Disconnect electrical connectors - 1, 2, 4, 5, 7, 8 - and lay connector strip aside.

Fig. 212: Audi A8 L Quattro 2007 - Component Locations - Removing Ignition Coils Using Ignition Coil Puller T40039

• Remove ignition coils using ignition coil puller T40039.

Fig. 213: Audi A8 L Quattro 2007 - Component Locations - Right Cylinder Head Cover Bolts Removal/Tightening Sequence

• Remove right cylinder head cover bolts in sequence - 16 to 1 -.
• Remove cylinder head cover.

Installing

• Tightening torques --> Right cylinder head cover tightening sequence

Installation is in reverse order of removal, note the following:

NOTE:

Replace cylinder head cover if damaged or leaking. Replace bolts for cylinder head cover if gasket is damaged.

• Clean sealing surfaces so they are completely free of any oil or grease.
• Tighten cylinder head cover bolts --> Right cylinder head cover tightening sequence
• Install upper section of air filter housing --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Audi A8 L Quattro 2007 - Cylinder head, removing and installing

Fig. 214: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Cylinder Head, Removing And Installing

Special tools, testers and auxiliary items required

• Torque wrench V.A.G 1331
• SW 17 socket V.A.G 1331/6
• SW 14 socket, open ring V.A.G 1331/8
• Multi-point socket T10070

Removing

NOTE:

The procedure is primarily shown for the left cylinder head in the following illustration. During installation, all cable ties must be re-installed at the same location.

• Drain coolant --> Cooling system, draining and filling.

Fig. 215: Audi A8 L Quattro 2007 - Component Locations - Knock Sensor Electrical Connectors

• Remove knock sensor electrical connectors - 1 and 2 - from bracket.
• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove left coolant pipe --> Left coolant pipe, removing and installing.
• Remove right coolant pipe --> Right coolant pipe, removing and installing (for right cylinder head).

• Remove left secondary air injection combi-valve --> Left combination valve for Secondary Air Injection, removing and installing (for left cylinder head).
• Remove right secondary air injection combi-valve --> Right combination valve for Secondary Air Injection, removing and installing.
• Remove rear coolant pipe --> Rear coolant line, removing and installing.
• Remove torque support bracket --> Torque support bracket, removing and installing (for right cylinder head).

• Remove cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Remove affected oxygen sensor in front of catalytic converter --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Remove camshaft timing chains from camshafts --> Camshaft timing chains, removing from camshafts.

• Remove front muffler: left --> Left front muffler, removing and installing , right --> Right front muffler, removing and installing.

Left cylinder head:

• Remove left front wheel.
• Remove front part of left front wheel housing liner --> 66 - EXTERIOR EQUIPMENT .

Fig. 216: Audi A8 L Quattro 2007 - Component Locations - Exhaust Manifold Nuts

• Remove bolt - arrow - and pull hydraulic oil pressure pipe forward slightly.
• Remove nuts - 6 to 1 -.

NOTE:

To improve clarity, the engine is shown removed. Both lower securing strips remain installed.

Fig. 217: Audi A8 L Quattro 2007 - Component Locations - Left Front Muffler Nuts

• Remove bolt - 2 - at left catalytic converter bracket.

NOTE:

Ignore items - 1 and 3 -.

• Remove left exhaust manifold from cylinder head stud bolts and securing strips.
• Lay aside left exhaust manifold with catalytic converter in engine compartment.

Fig. 218: Audi A8 L Quattro 2007 - Component Locations - Torque Support & Bolts

Right cylinder head:

• Remove bolts - 2 through 5 - and remove torque support.

NOTE:

Ignore - 1 -.

Fig. 219: Audi A8 L Quattro 2007 - Component Locations - Right Exhaust Manifold With Catalytic Converter Nuts

• Remove nuts - 6 to 1 -.

NOTE:

To improve clarity, the removed engine is shown. Both lower securing strips remain installed.

Fig. 220: Audi A8 L Quattro 2007 - Component Locations - Right Front Muffler Nuts

• Remove bolt - 2 - at right catalytic converter bracket.

NOTE:

Ignore - 1 -.

• Remove right exhaust manifold from cylinder head stud bolts and securing strips.
• Lay aside right exhaust manifold with catalytic converter in engine compartment.

Continued for both sides:

Fig. 221: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

• Remove bolts - 1 and 2 - and remove affected chain tensioner.

Fig. 222: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connectors At Fuel Injectors & Removing High Pressure Lines From Connector On Fuel Rail

• Disconnect electrical connectors - arrows - at fuel injectors.
• Remove high pressure line - 2 - from connector on fuel rail.
• Remove high pressure line - 1 - from connector on fuel rail by counterholding at hex head with an open end wrench and loosening union nut.

NOTE:

Do not change bent shape of high pressure lines.

Fig. 223: Audi A8 L Quattro 2007 - Component Locations - Identifying Locking Bolt

• Remove locking bolt - arrow -.

Fig. 224: Audi A8 L Quattro 2007 - Component Locations - Cylinder Head Bolts Loosening Sequence

• Remove bolts - arrows -.
• Using Socket T10070 , remove cylinder head bolts in - 1 to 10 - sequence.
• Remove bolts and carefully remove cylinder head.
• Lay cylinder head on a soft surface (foam).

Installing

• Tightening torques --> Cylinder head, assembly overview , Cylinder head tightening sequence , --> Camshaft timing chain, assembly overview , --> Secondary air injection (AIR) system, assembly overview.

CAUTION:

Risk of damaging sealing surfaces. Carefully remove sealant residue from cylinder head and cylinder block. Make sure that no long scrapes or scratches result. Risk of damaging cylinder block. No oil or coolant must be in the cylinder head bolt blind holes in the cylinder block. Risk of leaks in cylinder head seal. Carefully remove all grinding and sanding residue. Only unpack new cylinder head gasket immediately prior to installation. To prevent cylinder head seal silicone layer and recessed area from being damaged, always handle seal extremely carefully. Risk of damaging open valves. If a replacement cylinder head is installed, only remove plastic base right before cylinder head is installed to protect open valves. Risk of damaging valves and piston heads after working on valvetrain. To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

NOTE:

Replace bolts which have been tightened to torque. Replace self-locking nuts as well as sealing rings and seals. If a replacement cylinder head is installed, contact surfaces between bearing elements, roller rocker levers and cam running surfaces must be lubricated before installing cylinder head cover. Secure all hose connections using hose clamps of series-production status During installation, all cable ties must be re-installed at the same location.

Fig. 225: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Check whether camshafts of both cylinder heads stand in "TDC" position.

• Camshaft Clamp T40070 must be installed on both cylinder heads and tightened to 25 Nm.

Fig. 226: Audi A8 L Quattro 2007 - Component Locations - Securing Crankshaft In TDC Position Using Crankshaft Holder 3242

• Crankshaft holder 3242 must be installed.

• Position cylinder head gasket.

Fig. 227: Audi A8 L Quattro 2007 - Component Locations - Identifying Alignment Bushings In Cylinder Block

• Pay close attention to alignment bushings in cylinder block - arrows -.
• Pay attention to installation position of cylinder head gasket, marking "oben" (top) or part number must face toward cylinder head.

• Install cylinder head.

Fig. 228: Audi A8 L Quattro 2007 - Component Locations - Cylinder Head Tightening Sequence

• Tighten cylinder head bolts --> Cylinder head tightening sequence

NOTE:

Bolts must not be tightened after repairs.

Fig. 229: Audi A8 L Quattro 2007 - Component Locations - Identifying Locking Bolt

• Tighten locking screw - arrow -.

Fig. 230: Audi A8 L Quattro 2007 - Component Locations - Pressing Left/Right Camshaft Timing Chain Guide Rail Inward And Securing Chain Tensioner With Locking Pin T40071

• Check whether camshaft timing chain tensioner guide rail is secured with Locking Pin T40071.

NOTE:

If the tensioning element was removed from the chain tensioner, note installation position: Hole in housing floor faces toward chain tensioner, piston faces toward tensioning rail. Disregard - arrow -.

Fig. 231: Audi A8 L Quattro 2007 - Component Locations - Identifying Chain Tensioner Oil Screen, Gasket & Chain Tensioner

• Clean chain tensioner oil screen - 2 -.
• Place a new gasket - 3 - onto rear of chain tensioner - 1 -.
• Set chain tensioner in place and install camshaft timing chain, as shown in illustration.

Fig. 232: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

• Tighten bolts - 1 and 2 -.

The rest of installation is in reverse order of removal, note the following:

• Install exhaust manifold: Left --> Left exhaust manifold with catalytic converter, removing and installing , right --> Right exhaust manifold with catalytic converter, removing and installing.
• Install torque support and torque support bracket --> Assembly mount, overview.
• Install front muffler: left --> Left front muffler, removing and installing , right --> Right front muffler, removing and installing.
• Install camshaft timing chains Installing.

• Install left and right timing chain covers --> Installing.
• Install rear coolant pipe --> Rear coolant line, removing and installing.
• Install combination valve for Secondary Air Injection (AIR) system: Left --> Left combination valve for Secondary Air Injection, removing and installing , right --> Right combination valve for Secondary Air Injection, removing and installing.
• Install left coolant pipe --> Left coolant pipe, removing and installing.

• Install right coolant pipe --> Right coolant pipe, removing and installing.
• Install cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install headlamps --> 94 - LIGHTS, SWITCHES - EXTERIOR .

• Install front bumper cover --> 63 - BUMPERS .
• Check headlight adjustment 404.

Fig. 233: Audi A8 L Quattro 2007 - Component Locations - Tightening Union Nut At Fuel Rail Using Torque Wrench V.A.G 1331 With 14 Mm Open End Wrench Socket V.A.G 1331/8

• To tighten SW 14 union nut at fuel rail, use Torque Wrench V.A.G 1331 with Socket Insert AF 14, open ring V.A.G 1331/8 --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 234: Audi A8 L Quattro 2007 - Component Locations - Tightening SW 17 Union Nut At Fuel Rail Using Torque Wrench V.A.G 1331 With SW 17 Socket V.A.G 1331/6

• To tighten SW 17 union nut at fuel rail, use Torque Wrench V.A.G 1331 with SW 17 socket V.A.G 1331/6 --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Align exhaust system free of tension --> Exhaust system, installing free of tension.
• Change engine oil 404.
• Change coolant --> Cooling system, draining and filling.

Audi A8 L Quattro 2007 - Compression pressure, measuring

Fig. 235: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Compression Pressure, Measuring

Special tools, testers and auxiliary items required

• Spark plug removal tool 3122 B
• Compression tester V.A.G 1763
• Puller T40039

Work procedure

• Engine oil temperature at least 30? C.
• Battery voltage at least 12.5 V.

• Switch off ignition.
• Remove Engine Control Module (ECM) J623 --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 236: Audi A8 L Quattro 2007 - Component Locations - Releasing Connector Fixings And Disconnecting Control Module Connectors

• Only remove smaller connector - 1 - from engine control module (ECM) by removing connector lock - arrow -.

NOTE:

The larger connector - 2 - remains connected.

Fig. 237: Audi A8 L Quattro 2007 - Component Locations - Identifying Vacuum Line, Air Guide Hose, Crankcase Ventilation Hose & Hose Clamps

• Free up fuel line and line to EVAP canister on air guide pipe.
• Disconnect electrical harness connector - 1 - at Mass Air Flow (MAF) Sensor G70.
• Remove vacuum line - 4 - to air guide hose from suction jet pump.

Fig. 238: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Dipstick, Bolts & Ignition Coils Electrical Harness Connectors

• Remove oil dipstick - 1 - from guide tube.
• Remove bolts - 2 and 3 -.
• Disconnect electrical harness connectors at ignition coils.
• Press electrical wiring harness to side.

Fig. 239: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts & Ignition Coils Electrical Harness Connectors

• Remove bolts - 1 and 2 -.
• Disconnect electrical harness connectors at ignition coils.
• Press electrical wiring harness to side.

Fig. 240: Audi A8 L Quattro 2007 - Component Locations - Removing Ignition Coils Using Ignition Coil Puller T40039

• Remove all ignition coils using Ignition Coil Puller T40039.
• Remove spark plugs using Spark Plug Removal Tool 3122 B.
• Check compression using compression tester V.A.G 1763.

NOTE:

Using tester operating instructions. Have a second technician press accelerator pedal completely and at same time operate starter long enough until pressure increase no longer appears on tester.

Compression pressure	Bar pressure
New	10.0 to 14.0
Wear limit	9.0
Maximum difference between cylinders	3.0

Assembly is in reverse order of removal, note the following:

• Install sparks plugs 404.
• Install Engine Control Module (ECM) J623 --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Faults are saved in ECM when electrical connectors are disconnected:

• Connect Vehicle Diagnosis, testing info. system VAS 5051.
• Start "Guided Functions" operating mode.
• Generate readiness code in ECM.

Audi A8 L Quattro 2007 - Chain drive Timing chain covers, assembly overview

Fig. 241: Audi A8 L Quattro 2007 - Component Locations - Timing Chain Covers, Assembly Overview

1 - Bolt

• Tightening order --> Timing chain lower cover tightening sequence

2 - Transmission-side crankshaft sealing ring

• Replacing --> Transmission-side crankshaft sealing ring, replacing.

3 - Alignment bushing

• 2 pieces

4 - Left cylinder head gasket

5 - Bolt

• Tightening order Left timing chain cover, tightening sequence

6 - Left timing chain cover

• Removing and installing --> Left and right timing chain covers, removing and installing
• Tightening order --> Left timing chain cover, tightening sequence

7 - O-ring

• Replace

8 - Left coolant intermediate pipe

• Drive out with drift

9 - O-ring

• Replace

10 - Bolt

• Tightening order --> Right timing chain cover, tightening sequence

11 - Right timing chain cover

• Removing and installing --> Left and right timing chain covers, removing and installing
• Tightening order --> Right timing chain cover, tightening sequence

12 - O-ring

• Replace

13 - Right coolant intermediate pipe

• Drive out with drift

14 - O-ring

• Replace

15 - Right cylinder head gasket

16 - Alignment bushing

• 2 pieces

17 - Lower timing chain cover

• Removing and installing --> Timing chain lower cover, removing and installing
• Tightening order --> Timing chain lower cover tightening sequence

Audi A8 L Quattro 2007 - Left timing chain cover, tightening sequence

Fig. 242: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Timing Chain Cover And Tighten/Removing Bolts Sequence

• Tighten bolts - 1 to 8 - in sequence.

• 9 Nm

Audi A8 L Quattro 2007 - Right timing chain cover, tightening sequence

Fig. 243: Audi A8 L Quattro 2007 - Component Locations - Identifying Right Timing Chain Cover And Tighten/Removing Bolts Sequence

• Tighten bolts - 1 to 8 - in sequence.

• 9 Nm

Audi A8 L Quattro 2007 - Timing chain lower cover tightening sequence

Fig. 244: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts And Lower Timing Chain Cover

• Replace M6 bolts - 1, 3, 5, 6, 7, 11, 12, 13 - and - arrows -.
• Tighten bolts in 6 stages as follows:
• Insert bolts - arrows - with locking compound and pre-tighten to 5 Nm.
• Tighten bolts - 1 to 13 - in diagonal sequence to 8 Nm.

• Tighten bolts - arrows - to 8 Nm.
• Tighten M8 bolts - 2, 4, 8, 9, 10 - in a diagonal sequence to 22 Nm.
• Rotate M6 bolts - 1, 3, 5, 6, 7, 11, 12, 13 - an additional 90? (¹ /₄ turn) in a diagonal sequence.
• Tighten bolts - arrows - an additional 90? (¹ /₄ turn).

Audi A8 L Quattro 2007 - Left and right timing chain covers, removing and installing

Special tools, testers and auxiliary items required

• Hand drill with plastic brush attachment
• Protective glasses
• Sealant

Audi A8 L Quattro 2007 - Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

Fig. 245: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.
• Drain coolant --> Cooling system, draining and filling.
• Remove left coolant pipe --> Left coolant pipe, removing and installing.
• Remove right coolant pipe --> Right coolant pipe, removing and installing.

• Remove oxygen sensors G39 and G108 (in front of catalytic converter) --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove secondary air injection combi-valve: left --> Left combination valve for Secondary Air Injection, removing and installing , right --> Right combination valve for Secondary Air Injection, removing and installing.
• Remove rear coolant pipe --> Rear coolant line, removing and installing.

Fig. 246: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Timing Chain Cover And Tighten/Removing Bolts Sequence

• Remove bolts - 1 to 8 - and remove left timing chain cover.

Fig. 247: Audi A8 L Quattro 2007 - Component Locations - Identifying Right Timing Chain Cover And Tighten/Removing Bolts Sequence

• Remove bolts - 1 to 8 - and remove right timing chain cover.

Audi A8 L Quattro 2007 - Installing

• Tightening torques --> Left timing chain cover, tightening sequence , Right timing chain cover, tightening sequence.

NOTE:

Replace M6 bolts and O-rings. Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location.

CAUTION:

Risk of eye injury. Wear safety glasses.

CAUTION:

Risk of contaminating lubricating system. Cover open parts of engine.

Fig. 248: Audi A8 L Quattro 2007 - Component Locations - Using Rotating Plastic Brush To Remove Any Sealant Residue From Sealing Flange, Cylinder Block And Upper Part Of Oil Pan

• Remove sealant residue on timing chain covers and cylinder head, e.g. with a rotating plastic brush.
• Clean sealing surfaces so they are completely free of any oil or grease.

Fig. 249: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).

Fig. 250: Audi A8 L Quattro 2007 - Component Locations - Identifying Timing Chain Cover, Coolant Intermediate Pipe, O-Rings, And Sealant Bead

• Drive left coolant intermediate pipe - 2 - out of timing chain cover with a drift.
• Replace O-rings - 1 - at coolant intermediate pipe - 2 -.
• Insert coolant intermediate pipe in left timing chain cover.
• Apply sealant bead - arrows - on clean sealing surfaces of left timing chain cover, as shown in illustration.

• Thickness of sealant bead: 2.5 mm.

NOTE:

Timing chain covers must be installed within 5 minutes after applying sealant.

Fig. 251: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Timing Chain Cover And Tighten/Removing Bolts Sequence

• Position left timing chain cover and tighten bolts --> Left timing chain cover, tightening sequence

Fig. 252: Audi A8 L Quattro 2007 - Component Locations - Identifying Timing Chain Cover, Coolant Intermediate Pipe, O-Rings, And Sealant Bead

• Drive right coolant intermediate pipe - 2 - out of right timing chain cover with a drift.
• Replace O-rings - 1 - at coolant intermediate pipe - 2 -.
• Insert coolant intermediate pipe in right timing chain cover.
• Apply sealant bead - arrows - on clean sealing surfaces of right timing chain cover, as shown in illustration.

• Thickness of sealant bead: 2.5 mm.

Fig. 253: Audi A8 L Quattro 2007 - Component Locations - Identifying Right Timing Chain Cover And Tighten/Removing Bolts Sequence

• Position right timing chain cover and tighten bolts --> Right timing chain cover, tightening sequence

The rest of installation is in reverse order of removal, note the following:

• Install rear coolant pipe --> Rear coolant line, removing and installing.
• Install secondary air injection combination valve: Left --> Left combination valve for Secondary Air Injection, removing and installing , right --> Right combination valve for Secondary Air Injection, removing and installing.
• Install oxygen sensors G39 and G108 --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left coolant pipe --> Left coolant pipe, removing and installing.

• Install right coolant pipe --> Right coolant pipe, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Timing chain lower cover, removing and installing

Special tools, testers and auxiliary items required

Fig. 254: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782
• Hand drill with plastic brush attachment
• Protective glasses
• Sealant

Removing

Fig. 255: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 1 and 2 -.

NOTE:

Ignore items - 3 and 4 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove automatic transmission --> 37 - CONTROLS, HOUSING .
• Remove drive plate --> Drive plate, removing and installing.
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.

Fig. 256: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts And Lower Timing Chain Cover

• Remove bolts - arrows -.
• Remove bolts - 1 through 13 - and remove lower timing chain cover.
• Press transmission-side crankshaft sealing ring out of lower timing chain cover.

Installing

• Tightening torques --> Timing chain lower cover tightening sequence

Installation is in reverse order of removal, note the following:

• Pull alignment bushing out of top right of cylinder block.

Fig. 257: Audi A8 L Quattro 2007 - Component Locations - Chamfer Alignment Bushing With File

• Chamfer alignment bushing with a file, as shown in the illustration.

• Dimension - x - = 6.5 mm.
• Dimension - y - = 8 mm.

• Install alignment bushing into cylinder block so that chamfered side faces upward.

NOTE:

Because of the chamfer, the lower timing chain cover can be positioned more easily when the cylinder head is installed.

CAUTION:

Risk of eye injury. Wear safety glasses.

CAUTION:

Risk of contaminating lubricating system. Cover open parts of engine.

Fig. 258: Audi A8 L Quattro 2007 - Component Locations - Using Rotating Plastic Brush To Remove Any Sealant Residue From Sealing Flange, Cylinder Block And Upper Part Of Oil Pan

• Remove sealant residue on lower timing chain cover and on cylinder block and cylinder head, e.g. with a rotating plastic brush.
• Clean sealing surfaces so they are completely free of any oil or grease.

Fig. 259: Audi A8 L Quattro 2007 - Component Locations - Cleaning Old Sealant From Holes In Cylinder Head Gaskets

• Clean old sealant from holes - arrow - in the cylinder head gaskets.

NOTE:

With the cylinder head installed only half of the holes in the cylinder head gasket are visible.

CAUTION:

Risk of damaging cylinder head seal. Only bend ends of cylinder head seals slightly, do not kink.

NOTE:

A kinked cylinder head gasket must be replaced.

Fig. 260: Audi A8 L Quattro 2007 - Component Locations - Bending Ends Of Cylinder Head Gaskets Very Slightly Downward Until Upper Sealing Surface Of Gasket And Cylinder Head Can Be Cleaned

• Bend the ends of cylinder head gaskets very slightly downward - arrows - until upper sealing surface of gasket and cylinder head can be cleaned.
• Clean both cylinder head gaskets, top and bottom, so they are completely free of any oil or grease.

Fig. 261: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).

CAUTION:

Risk of damaging cylinder head seal. Only bend ends of cylinder head seals slightly, do not kink.

NOTE:

A kinked cylinder head gasket must be replaced.

Fig. 262: Audi A8 L Quattro 2007 - Component Locations - Bending Ends Of Cylinder Head Gaskets Very Slightly Downward Until Upper Sealing Surface Of Gasket And Cylinder Head Can Be Cleaned

• Coat sealing surfaces of the cylinder head gaskets, top and bottom, to do this with a thin layer of sealant, slightly bending cylinder head gaskets downward again - arrows -.
• To coat surface between cylinder head and gasket, use a flat object, e.g. a feeler gauge.

Fig. 263: Audi A8 L Quattro 2007 - Component Locations - Applying Sealant Beads On Clean Sealing Surfaces Of Lower Timing Chain Cover

• Apply sealant beads - 1 to 9 - on clean sealing surfaces of lower timing chain cover, as shown in illustration.

• Thickness of sealant beads: 2.5 mm.

NOTE:

Lower timing chain cover must be installed within 5 minutes of applying sealant.

Fig. 264: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts And Lower Timing Chain Cover

• Set lower timing chain cover in place, guiding cover at an angle from below onto sealing surface of the cylinder block and cylinder head.
• When installing, make sure that the cylinder head gaskets do not become damaged.

NOTE:

A damaged cylinder head seal must be replaced.

• Tighten bolts --> Timing chain lower cover tightening sequence.

The rest of installation is in reverse order of removal, note the following:

• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.
• Install oil filter housing --> Oil filter housing, removing and installing.
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left and right timing chain covers --> Installing.

• Install drive plate --> Drive plate, removing and installing.
• Install automatic transmission --> 37 - CONTROLS, HOUSING .
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Camshaft timing chain, assembly overview Left camshaft timing chain

Fig. 265: Audi A8 L Quattro 2007 - Component Locations - Camshaft Timing Chain, Assembly Overview - Left Camshaft Timing Chain

1 - Camshaft adjuster for exhaust camshaft

• Identification "Exhaust"
• Removing and installing --> Camshaft timing chain, removing and installing

2 - Bolt

• Replace
• 80 Nm plus an additional 90? (¹ /₄ turn).

3 - Bolt

• Replace
• 80 Nm plus an additional 90? (¹ /₄ turn).

4 - Camshaft adjuster for intake camshaft

• Identification "Intake"
• Removing and installing --> Camshaft timing chain, removing and installing

5 - Left camshaft timing chain

CAUTION:

Risk of destroying due to reversed running direction on a used timing chain. Mark timing chain running direction with arrows using paint for reinstallation.

• Removing and installing --> Camshaft timing chain, removing and installing

6 - Bolt

• Replace
• 5 Nm plus an additional 90? (¹ /₄ turn).

7 - Guide piece

8 - Chain tensioner for left camshaft timing chain

• Removing and installing --> Camshaft timing chain, removing and installing

9 - Oil strainer

• Set into chain tensioner
• Observe locating tabs on circumference

10 - Gasket

• Replace
• Clipped onto chain tensioner

11 - Mounting bracket for drive sprocket

12 - Bolt

• 9 Nm

13 - Drive sprocket for left camshaft timing chain

14 - Thrust washer for drive sprocket

15 - Bolt

• 22 Nm

Audi A8 L Quattro 2007 - Right camshaft timing chain

Fig. 266: Audi A8 L Quattro 2007 - Component Locations - Camshaft Timing Chain, Assembly Overview - Right Camshaft Timing Chain

1 - Mounting bracket for drive sprocket

• For right camshaft timing chain
• Asymmetrical version
• Installed location --> Right camshaft timing chain drive sprocket mounting bracket location

2 - Bolt

• 42 Nm

3 - Camshaft adjuster for exhaust camshaft

• Identification "Exhaust"
• Removing and installing --> Camshaft timing chain, removing and installing

4 - Bolt

• Replace
• 80 Nm plus an additional 90? (¹ /₄ turn).

5 - Bolt

• Replace
• 80 Nm plus an additional 90? (¹ /₄ turn).

6 - Camshaft adjuster for intake camshaft

• Identification "Intake"
• Removing and installing --> Camshaft timing chain, removing and installing

7 - Right camshaft timing chain

CAUTION:

Risk of destroying due to reversed running direction on a used timing chain. Mark timing chain running direction with arrows using paint for reinstallation.

• Removing and installing --> Camshaft timing chain, removing and installing

8 - Chain tensioner for right camshaft timing chain

• Removing and installing --> Camshaft timing chain, removing and installing

9 - Guide piece

10 - Oil strainer

• Set into chain tensioner
• Installed location: Observe locating tabs on circumference

11 - Gasket

• Replace
• Clipped onto chain tensioner

12 - Bolt

• Replace
• 5 Nm plus an additional 90? (¹ /₄ turn).

13 - Thrust washer for drive sprocket

14 - Drive sprocket for right camshaft timing chain

Audi A8 L Quattro 2007 - Right camshaft timing chain drive sprocket mounting bracket location

Fig. 267: Audi A8 L Quattro 2007 - Component Locations - Right Camshaft Timing Chain Drive Sprocket Mounting Bracket Location

• Alignment bushings in right camshaft timing chain drive sprocket mounting pins - 3 - must engage in holes in thrust washer - 1 - and cylinder block.

2 - Drive sprocket for right camshaft timing chain

4 - Bolt

Audi A8 L Quattro 2007 - Camshaft timing chains, removing from camshafts

Fig. 268: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Camshaft Timing Chains, Removing From Camshafts

Special tools, testers and auxiliary items required

• Locking pin 3242
• Torque wrench V.A.G 1332
• Assembly tool V.A.G 1332/9
• Socket T40058

• Camshaft Clamp T40070 , qty. 2
• Locking Pin T40071 , qty. 2

Special tools, testers and auxiliary items required

Fig. 269: Audi A8 L Quattro 2007 - Component Locations - Wrench T40079

• Wrench T40079

Audi A8 L Quattro 2007 - Removing

NOTE:

According to the following description, the timing chains for camshafts remain on engine. Even if work is performed only on one of the cylinder heads, the procedure described must be followed, since the valve timing at both cylinder heads must be adjusted.

• Remove cylinder head cover: left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.

Fig. 270: Audi A8 L Quattro 2007 - Component Locations - Inserting Guide Pin Of Adapter T40058 So Large Diameter Points To Engine

• Insert guide pin of socket T40058 so that small diameter - arrow 2 - points to engine. Large diameter - arrow 1 - points to socket.

Fig. 271: Audi A8 L Quattro 2007 - Component Locations - Using Socket T40058 To Rotate Crankshaft To TDC

• Using Socket T40058 , rotate crankshaft in direction of engine rotation - arrow - to "TDC".

Fig. 272: Audi A8 L Quattro 2007 - Component Locations - Identifying Threaded Holes In Camshafts Must Face Upward

• The threaded holes - arrows - in camshafts must face upward.

Fig. 273: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Mount camshaft locating tool T40070 to both cylinder heads and tighten bolts - arrows - to 25 Nm.

• The Camshaft Locating Tool T40070 is correctly positioned when holes for the cylinder head bolts remain free.

Fig. 274: Audi A8 L Quattro 2007 - Component Locations - Identifying Locking Bolt Of Upper Part Of Oil Pan

• Remove locking bolt - arrow - from upper part of oil pan.

CAUTION:

Risk of injury when touching "TDC" hole with finger. Do not rotate crankshaft - 1 -.

Fig. 275: Audi A8 L Quattro 2007 - Component Locations - Installing/Removing Crankshaft Holder 3242 In Bore

• Install crankshaft holder 3242 into hole to 20 Nm, if necessary rotate crankshaft very slightly back and forth to completely center the holder.

Fig. 276: Audi A8 L Quattro 2007 - Component Locations - Pressing Left Camshaft Timing Chain Tensioner Glide Track Inward With Screwdriver As Far As Stop And Securing Chain Tensioner With Locking Pin T40071

• Press left camshaft timing chain tensioner glide track inward with a screwdriver - 1 - as far as stop and secure chain tensioner with Locking Pin T40071.

NOTE:

The toothed belt tensioner is lubricated with oil and should only be compressed slowly by applying constant pressure.

Fig. 277: Audi A8 L Quattro 2007 - Component Locations - Pressing Right Camshaft Timing Chain Tensioner Glide Track Inward With Screwdriver As Far As Stop And Securing Chain Tensioner With Locking Pin T40071

• Press right camshaft timing chain tensioner glide track inward with a screwdriver - 1 - as far as stop and secure chain tensioner with Locking Pin T40071.

NOTE:

The toothed belt tensioner is lubricated with oil and should only be compressed slowly by applying constant pressure.

• For re-installation, identify installation location of camshaft adjuster with paint.

Fig. 278: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts On Left Cylinder Head And Removing Both Camshaft Adjusters

• Remove bolts - 1 and 2 - on left cylinder head and remove both camshaft adjusters.

Fig. 279: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts On Right Cylinder Head And Removing Both Camshaft Adjusters

• For re-installation, identify installation location of camshaft adjuster with paint.
• Remove bolts - 1 and 2 - on right cylinder head and remove both camshaft adjusters.

Audi A8 L Quattro 2007 - Installing

• Tightening torques --> Camshaft timing chain, assembly overview , --> Upper part of oil pan, assembly overview.

NOTE:

Replace bolts which have been tightened to torque. Replace locking bolt O-ring.

CAUTION:

Risk of damaging valves and piston crowns. If camshafts are rotated, crankshaft may not rest with any piston at "TDC".

Fig. 280: Audi A8 L Quattro 2007 - Component Locations - Securing Crankshaft In TDC Position Using Crankshaft Holder 3242

• Drive chain for timing mechanism installed --> Drive chain for timing mechanism, removing and installing.
• Secure crankshaft in "TDC" position using Crankshaft Holder 3242.

Fig. 281: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Camshaft Clamp T40070 mounted on both cylinder heads and fastened to 25 Nm - arrows -.

Fig. 282: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts On Left Cylinder Head And Removing Both Camshaft Adjusters

• Reinstall camshaft adjuster on left cylinder head according to mark applied during removal.
• Place camshaft timing chain onto drive sprocket and onto camshaft adjusters and loosely thread in bolts - 1 and 2 -.

• Both camshaft adjusters must be able to still be rotated on camshaft and must not tip.

• Remove Locking Pin T40071.
• Reinstall camshaft adjuster on right cylinder head according to mark applied during removal.

Fig. 283: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts On Right Cylinder Head And Removing Both Camshaft Adjusters

• Place camshaft timing chain onto drive sprocket and onto camshaft adjusters and loosely thread in bolts - 1 and 2 -.

• Both camshaft adjusters must be able to still be rotated on camshaft and must not tip.

• Remove Locking Pin T40071.

Fig. 284: Audi A8 L Quattro 2007 - Component Locations - Positioning Adapter T40079 On Intake Camshaft Adjuster At Left Cylinder Head

• Position Key T40079 on intake camshaft adjuster at left cylinder head.
• Position Torque Wrench V.A.G 1332 with Open Ring Spanner Insert V.A.G 1332/9 on Key T40079.
• Have a second technician pre-tension camshaft adjuster to 40 Nm in direction of - arrow -.
• Tighten bolts as follows while camshaft adjuster is held under pre-tension:

Pre-tighten bolt - 1 - to intake camshaft to 60 Nm. Pre-tighten bolt - 2 - to exhaust camshaft to 60 Nm.

Fig. 285: Audi A8 L Quattro 2007 - Component Locations - Positioning Adapter T40079 On Exhaust Camshaft Adjuster At Right Cylinder Head

• Position Key T40079 on exhaust camshaft adjuster at right cylinder head.
• Position Torque Wrench V.A.G 1332 with Open Ring Spanner Insert V.A.G 1332/9 on Key T40079.
• Have a second technician pre-tension camshaft adjuster to 40 Nm in direction of - arrow -.
• Tighten bolts as follows while camshaft adjuster is held under pre-tension:

Pre-tighten bolt - 1 - to intake camshaft to 60 Nm. Pre-tighten bolt - 2 - to exhaust camshaft to 60 Nm.

• Remove Key T40079.

Fig. 286: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Remove Camshaft Clamps T40070 on both cylinder heads - arrows -.

Fig. 287: Audi A8 L Quattro 2007 - Component Locations - Tightening Camshaft Bolts On Left Cylinder Head

• Tighten camshaft adjuster bolts on left cylinder head as follows:

Tighten bolt - 1 - to intake camshaft to final torque. Tighten bolt - 2 - to exhaust camshaft to final torque.

Fig. 288: Audi A8 L Quattro 2007 - Component Locations - Tightening Camshaft Bolts On Right Cylinder Head

• Tighten camshaft adjuster bolts on right cylinder head as follows:

Tighten bolt - 1 - to intake camshaft to final torque. Tighten bolt - 2 - to exhaust camshaft to final torque.

Fig. 289: Audi A8 L Quattro 2007 - Component Locations - Securing Crankshaft In TDC Position Using Crankshaft Holder 3242

• Remove crankshaft holder 3242.

Fig. 290: Audi A8 L Quattro 2007 - Component Locations - Using Socket T40058 To Rotate Crankshaft To TDC

• Using Socket T40058 turn crankshaft two complete rotations in direction of engine rotation - arrow - until crankshaft stands at "TDC" again.

NOTE:

If rotated unitentionally beyond "TDC" , crankshaft must be rotated back approx. 30? and set to "TDC" again.

Fig. 291: Audi A8 L Quattro 2007 - Component Locations - Identifying Threaded Holes In Camshafts Must Face Upward

• The threaded holes - arrows - in camshafts must face upward.

Fig. 292: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Mount camshaft locating tool T40070 to both cylinder heads and tighten bolts - arrows - to 25 Nm.

• The Camshaft Locating Tool T40070 is correctly positioned when the holes for the cylinder head bolts remain free.

Fig. 293: Audi A8 L Quattro 2007 - Component Locations - Installing/Removing Crankshaft Holder 3242 In Bore

• Install Crankshaft Holder 3242 in bore and tighten to 20 Nm.

• The crankshaft holder 3242 must engage in the locating hole of the crankshaft - 1 - , otherwise repeat adjustment.

• Remove camshaft locating tools on both cylinder heads.
• Remove crankshaft holder 3242.
• Tighten "TDC" marking locking bolt.

The rest of the installation is in reverse order of removal, note the following:

• Install left and right timing chain covers --> Installing.
• Install cylinder head covers: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

Audi A8 L Quattro 2007 - Camshaft timing chain, removing and installing

Special tools, testers and auxiliary items required

Fig. 294: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782

Audi A8 L Quattro 2007 - Removing

NOTE:

Even if work is performed only on one of the cylinder heads, the procedure described must be followed, since the valve timing at both cylinder heads must be adjusted.

Fig. 295: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 1 and 2 -.

NOTE:

Ignore items - 3 and 4 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove automatic transmission --> 37 - CONTROLS, HOUSING .
• Remove drive plate --> Drive plate, removing and installing.
• Remove the cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.
• Remove lower timing chain cover --> Timing chain lower cover, removing and installing.

• Remove camshaft timing chains from camshafts --> Camshaft timing chains, removing from camshafts.

Fig. 296: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

• Identify running direction of left camshaft timing chain with paint for reinstallation.
• Remove bolts - 1 and 2 - and remove left chain tensioner and left camshaft timing chain.

Fig. 297: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Right Chain Tensioner And Right Camshaft Timing Chain

• Identify running direction of right camshaft timing chain with paint for reinstallation.
• Remove bolts - 1 and 2 - and remove right chain tensioner and right camshaft timing chain.

Audi A8 L Quattro 2007 - Installing

• Tightening torque --> Camshaft timing chain, assembly overview.

NOTE:

If the tensioning element was removed from the chain tensioner, note installation position: Hole in housing floor faces toward chain tensioner, piston faces toward tensioning rail. Replace bolts which have been tightened to torque. Replace gasket.

CAUTION:

Risk of damaging valves and piston crowns. If camshafts are rotated, crankshaft may not rest with any piston at "TDC".

Fig. 298: Audi A8 L Quattro 2007 - Component Locations - Pressing Left/Right Camshaft Timing Chain Guide Rail Inward And Securing Chain Tensioner With Locking Pin T40071

• Press left and right camshaft timing chain guide rail inward - arrow - as far as stop and secure chain tensioner with Locking Pin T40071.

Fig. 299: Audi A8 L Quattro 2007 - Component Locations - Identifying Chain Tensioner Oil Screen, Gasket & Chain Tensioner

• Clean oil strainer - 2 - in both chain tensioners if necessary.
• Place a new gasket - 3 - onto rear of chain tensioner - 1 -.

Fig. 300: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

• Insert chain tensioner in left cylinder head and position camshaft timing chain according to mark applied during removal, as shown in illustration.
• Tighten bolts - 1 and 2 -.

Fig. 301: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Right Chain Tensioner And Right Camshaft Timing Chain

• Insert chain tensioner in right cylinder head and position camshaft timing chain according to mark applied during removal, as shown in illustration.
• Tighten bolts - 1 and 2 -.

Further installation is in reverse order of removal, note the following:

• Position camshaft timing chains on camshafts --> Installing.
• Install lower timing chain cover --> Timing chain lower cover, removing and installing.
• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.
• Install oil filter housing --> Oil filter housing, removing and installing.

• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left and right timing chain covers --> Installing.
• Install cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Install drive plate --> Drive plate, removing and installing.

• Install automatic transmission --> 37 - CONTROLS, HOUSING .
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Timing mechanism drive chain, assembly overview

Fig. 302: Audi A8 L Quattro 2007 - Component Locations - Timing Mechanism Drive Chain, Assembly Overview

1 - Guide rail

2 - Bolt

• Replace
• 10 Nm plus an additional 90? (¹ /₄ turn).

3 - Bolt

• 22 Nm

4 - Thrust washer for drive sprocket

5 - Drive sprocket for left timing chain

6 - Bolt

• Replace
• 10 Nm additional 90? (¹ /₄ turn).

7 - Drive chain for timing mechanism

CAUTION:

Risk of destroying due to reversed running direction on a used drive chain. Mark drive chain running direction with arrows using paint for reinstallation.

• Removing and installing --> Drive chain for timing mechanism, removing and installing

8 - Guide rail

9 - Bolt

• Replace
• 10 Nm additional 90? (¹ /₄ turn).

10 - Bolt

• 9 Nm

11 - Mounting bracket for drive sprocket

• For right camshaft timing chain
• Asymmetrical version
• Installed location --> Right camshaft timing chain drive sprocket mounting bracket location

12 - Thrust washer

13 - Drive sprocket for right timing chain

14 - Pivot pin for drive sprocket

15 - Bolt

• Tightening torque --> Camshaft timing chain, assembly overview

16 - O-ring

• Replace

17 - Chain tensioner

18 - Bolt

• Replace
• 5 Nm additional 90? (¹ /₄ turn).

19 - Crankshaft

20 - Bolt

• Replace
• 10 Nm additional 90? (¹ /₄ turn).

Audi A8 L Quattro 2007 - Right camshaft timing chain drive sprocket mounting bracket location

Fig. 303: Audi A8 L Quattro 2007 - Component Locations - Right Camshaft Timing Chain Drive Sprocket Mounting Bracket Location

• Alignment bushings in right camshaft timing chain drive sprocket mounting pins - 3 - must engage in holes in thrust washer - 1 - and cylinder block.

2 - Drive sprocket for right camshaft timing chain

4 - Bolt

Audi A8 L Quattro 2007 - Drive chain for timing mechanism, removing and installing

Special tools, testers and auxiliary items required

Fig. 304: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782

Fig. 305: Audi A8 L Quattro 2007 - Component Locations - Securing Pin T40071

• Securing pin T40071

Removing

Fig. 306: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 1 and 2 -.

NOTE:

Ignore items - 3 and 4 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove automatic transmission --> 37 - CONTROLS, HOUSING .
• Remove drive plate --> Drive plate, removing and installing.
• Remove cylinder head cover: left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.
• Remove lower timing chain cover --> Timing chain lower cover, removing and installing.

• Remove camshaft timing chains --> Camshaft timing chain, removing and installing.
• Remove power take-off drive chain --> Power take-off drive chain, removing and installing.

Fig. 307: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Chain Tensioner

• Push drive chain tensioner guide rail in direction of - arrow - and secure chain tensioner using Locking Pin T40071.
• Identify running direction of drive chain with paint for reinstallation.
• Remove bolts - 1 - and remove guide rail.
• Remove bolts - 2 to 4 - and remove chain tensioner.

• Remove timing mechanism drive chain.

Installing

• Tightening torques --> Timing mechanism drive chain, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace bolts which have been tightened to torque.

• Route timing mechanism drive chain according to marks applied to drive chain sprockets during removal.

Fig. 308: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Chain Tensioner

• Install guide rail and tighten bolts - 1 -.
• Install chain tensioner and tighten bolts - 2 -.
• Press drive chain tensioner guide rail in direction of - arrow - and remove Locking Pin T40071 from chain tensioner.
• Install power take-off drive chain --> Power take-off drive chain, removing and installing.

• Install camshaft timing chains --> Installing.
• Install lower timing chain cover --> Timing chain lower cover, removing and installing.
• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.
• Install oil filter housing --> Oil filter housing, removing and installing.

• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left and right timing chain covers --> Installing.
• Install cylinder head covers: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Install drive plate --> Drive plate, removing and installing.

• Install automatic transmission --> 37 - CONTROLS, HOUSING .
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Power take-off drive chain, assembly overview

Fig. 309: Audi A8 L Quattro 2007 - Component Locations - Power Take-Off Drive Chain, Assembly Overview

1 - Bolt

• 9 Nm

2 - Chain tensioner

• With glide track

3 - Gasket

• Replace

4 - Spring

5 - Bolt

• 42 Nm

6 - Pivot pin for idler sprocket

7 - Idler sprocket for chain for power take-off

8 - Idler sprocket mounting bracket

9 - Bolt

• 9 Nm

10 - Power take-off drive chain

CAUTION:

Risk of destroying due to reversed running direction on a used drive chain. Mark drive chain running direction with arrows using paint for reinstallation.

• Removing and installing --> Power take-off drive chain, removing and installing

11 - Crankshaft

12 - Drive sprocket for power take-off

13 - Circlip

Audi A8 L Quattro 2007 - Power take-off drive chain, removing and installing

Special tools, testers and auxiliary items required

Fig. 310: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782

Fig. 311: Audi A8 L Quattro 2007 - Component Locations - Securing Pin T40071

• Securing pin T40071

Removing

Fig. 312: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 1 and 2 -.

NOTE:

Ignore items - 3 and 4 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove automatic transmission --> 37 - CONTROLS, HOUSING .
• Remove drive plate --> Drive plate, removing and installing.
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.
• Remove lower timing chain cover --> Timing chain lower cover, removing and installing.

Fig. 313: Audi A8 L Quattro 2007 - Component Locations - Pressing Tensioning Rail And Securing Chain Tensioner With Locking Pin T40071

• Identify running direction of power take-off drive chain with paint for reinstallation.
• Press tensioning rail in direction of - arrow - and secure chain tensioner with Locking Pin T40071.
• Remove bolt - 1 - and remove idler sprocket.

NOTE:

When removing, be careful of spring in drive spur gear shaft.

• Remove bolts - 2 to 4 - and remove chain tensioner.
• Remove power take-off drive chain.

Installing

• Tightening torques --> Power take-off drive chain, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace the gasket. Secure all hose connections using hose clamps appropriate for the model type .

• Install lower timing chain cover --> Timing chain lower cover, removing and installing.
• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.
• Install oil filter housing --> Oil filter housing, removing and installing.
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

• Install left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Install drive plate --> Drive plate, removing and installing.
• Install automatic transmission --> 37 - CONTROLS, HOUSING .
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Power take-off, assembly overview

Fig. 314: Audi A8 L Quattro 2007 - Component Locations - Power Take-Off, Assembly Overview

1 - Circlip

2 - Spur gear unit

• Cannot be replaced separately
• Removing and installing --> Spur gear unit, removing and installing

3 - Bolt

• 22 Nm

4 - Sealing ring for A/C compressor drive

• Replacing --> Power take-off seals, replacing.

5 - Dust seal cap for A/C compressor drive

6 - Clamp

7 - Drive shaft for A/C compressor

• 60 Nm

8 - O-ring

• Replace

9 - Power-steering pump

10 - O-ring

• Replace

11 - Drive shaft for oil pump

12 - Sealing ring for power-steering pump drive

• Replacing --> Power take-off seals, replacing.

13 - Spring

Audi A8 L Quattro 2007 - Power take-off seals, replacing

Fig. 315: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Power Take-Off Seals, Replacing

Special tools, testers and auxiliary items required

• Extractor hook T20143
• Pressure piece T40051
• Pressure piece T40052

Work procedure

• Remove air conditioning compressor --> 87 - AIR CONDITIONING .
• Remove power steering pump --> 48 - STEERING .

Fig. 316: Audi A8 L Quattro 2007 - Component Locations - Identifying Hose Clamp At Dust Cap

• Remove hose clamp at dust cap - arrow -.
• Remove dust cap together with A/C compressor input shaft from shaft end of A/C compressor drive spur gear.

Fig. 317: Audi A8 L Quattro 2007 - Component Locations - Prying Out Sealing Ring For A/C Compressor Drive Using Pulling Hook T20143/1

• Pry out A/C compressor drive seal using pulling hook T20143/1.

Fig. 318: Audi A8 L Quattro 2007 - Component Locations - Prying Out Power-Steering Pump Drive Seal Using Pulling Hook T20143/1

• Pry out power-steering pump drive seal using pulling hook T20143/1.

Fig. 319: Audi A8 L Quattro 2007 - Component Locations - Driving In Sealing Ring For A/C Compressor Drive Using Thrust Piece T40051

• Drive in sealing ring for A/C compressor drive using thrust piece T40051.

Fig. 320: Audi A8 L Quattro 2007 - Component Locations - Driving In Sealing Ring For Power-Steering Pump Drive Using Thrust Piece T40052

• Drive in sealing ring for power-steering pump drive using thrust piece T40052.

The rest of installation is in reverse order of removal, note the following:

• Install power steering pump --> 48 - STEERING .

Fig. 321: Audi A8 L Quattro 2007 - Component Locations - Identifying Hose Clamp At Dust Cap

NOTE:

Secure dust cap with a hose clamp appropriate to model type .

• Slide dust seal cap - arrow - with hose clamp already installed onto shaft end of A/C compressor drive spur gear.
• Install A/C compressor --> 87 - AIR CONDITIONING .

Audi A8 L Quattro 2007 - Spur gear unit, removing and installing

Fig. 322: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Spur Gear Unit, Removing And Installing

Special tools, testers and auxiliary items required

• Extractor hook T20143
• Pressure piece T40051
• Pressure piece T40052

Special tools, testers and auxiliary items required

Fig. 323: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782
• Sealant

Removing

Fig. 324: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 1 and 2 -.

NOTE:

Ignore items - 3 and 4 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove automatic transmission --> 37 - CONTROLS, HOUSING .
• Remove drive plate --> Drive plate, removing and installing.
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.
• Remove lower timing chain cover --> Timing chain lower cover, removing and installing.
• Remove power-steering pump from cylinder block.

Fig. 325: Audi A8 L Quattro 2007 - Component Locations - Identifying Hose Clamp At Dust Cap

• Remove hose clamp at A/C compressor dust cap - arrow -.
• Remove power take-off drive chain --> Power take-off drive chain, removing and installing.

Fig. 326: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts & Spur Gear Unit

• Remove bolts - 1 to 6 -.
• Remove spur gear unit.

Fig. 327: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Compression Spring Between Spur Gear Unit And Oil Pump Input Shaft

• Remove compression spring - 2 - between spur gear unit - 1 - and oil pump input shaft - 3 -.

Fig. 328: Audi A8 L Quattro 2007 - Component Locations - Identifying Drive Shaft For Oil Pump

• Remove drive shaft - arrow - for oil pump.

Installing

• Tightening torque --> Power take-off, assembly overview.

NOTE:

Replace sealing rings and O-rings.

Fig. 329: Audi A8 L Quattro 2007 - Component Locations - Removing A/C Compressor Drive Seal And Power Steering Pump Drive Seal Using Pulling Hook T20143/1

• Remove A/C compressor drive seal - 2 - and power steering pump drive seal - 3 - using pulling hook T20143/1.
• Remove O-ring - 1 -.
• Remove sealant residue on spur gear unit and cylinder block.
• Clean sealing surfaces so they are completely free of any oil or grease.

Fig. 330: Audi A8 L Quattro 2007 - Component Locations - Driving In Sealing Ring For A/C Compressor Drive Using Thrust Piece T40051 & Sealing Ring For Power-Steering Pump Drive Using Thrust Piece T40052

• Drive in sealing ring for A/C compressor drive using thrust piece T40051.
• Drive in sealing ring for power-steering pump drive using thrust piece T40052.

Fig. 331: Audi A8 L Quattro 2007 - Component Locations - Identifying Drive Shaft For Oil Pump

• Insert drive shaft - arrow - for oil pump into guide on oil pump.

NOTE:

To guarantee that the drive shaft engages correctly in oil pump, insert drive shaft only into oil pump, do not install together with front bearing cap.

Fig. 332: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 1.5 mm).

Fig. 333: Audi A8 L Quattro 2007 - Component Locations - Applying Sealant Beads To Clean Sealing Surfaces Of Spur Gear Unit

• Apply sealant beads - arrows - to clean sealing surfaces of spur gear unit as shown in illustration.

• Thickness of sealant beads: 2.0 mm.

• Position O-ring - 1 - and secure it with some grease.

NOTE:

The spur gear unit must be installed within 5 minutes after application of sealant.

Fig. 334: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Compression Spring Between Spur Gear Unit And Oil Pump Input Shaft

• Position compress spring - 2 - for input shaft - 3 - in spur gear unit - 1 -.

NOTE:

Secure dust cap with a hose clamp appropriate to model type .

Fig. 335: Audi A8 L Quattro 2007 - Component Locations - Identifying Hose Clamp At Dust Cap

• Slide dust seal cap - arrow - with hose clamp already installed onto shaft end of A/C compressor drive spur gear.

Fig. 336: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts & Spur Gear Unit

• Position spur gear unit and tighten bolts - 1 to 6 - in a diagonal sequence in stages.
• Install power take-off drive chain --> Power take-off drive chain, removing and installing.
• Slide power steering pump with new O-ring onto spur gear for power-steering pump drive.

The rest of installation is in reverse order of removal, note the following:

• Install lower timing chain cover --> Timing chain lower cover, removing and installing.
• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.
• Install oil filter housing --> Oil filter housing, removing and installing.
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

• Install left and right timing chain covers Installing.
• Install drive plate --> Drive plate, removing and installing.
• Install automatic transmission --> 37 - CONTROLS, HOUSING .
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Valvetrain Valvetrain

NOTE:

Cylinder heads with cracks between valve seats or between valve seat and spark plug thread can still be used without loss of service life if the cracks are minute (max. 0.3 mm width) or only the first four threads of a spark plug thread are cracked.

CAUTION:

Risk of damaging valves and piston heads after working on valvetrain. The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves. To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

Audi A8 L Quattro 2007 - Valvetrain, assembly overview

NOTE:

Cylinder head for cylinder bank 2 (left) is shown in illustration.

Fig. 337: Audi A8 L Quattro 2007 - Component Locations - Valvetrain, Assembly Overview

1 - Sealing plug

2 - Valve stem seal

• Replacing --> Valve stem seals, replacing.

3 - Valve spring

• Installed location --> Installed position of valve spring

4 - Support element

• With hydraulic valve clearance compensation
• Clipped into roller rocker lever - 8 -
• Checking --> Support elements with hydraulic adjustment, checking
• Mark for re-installation

• Lubricate contact surface

5 - Valve spring plate

6 - Valve keys

7 - Securing clip

• Check for secure seat

8 - Roller rocker lever

• Mark for re-installation
• Check roller for easy movement
• Lubricate contact surface
• To assemble, clip onto support element - 4 - with securing clip - 7 -

9 - Intake camshaft

• Removing and installing --> Camshafts, removing and installing
• Measuring axial play --> Camshaft axial play, measuring
• Measure radial clearance using Plastigage (roller rocker lever removed)
• Radial clearance at bearing-dia. 24 mm: 0.024 to 0.066 mm

• Radial clearance at bearing-dia. 36 mm: 0.032 to 0.078 mm
• Run-out: maximum 0.04 mm

10 - Gasket

• Replace

11 - Bearing bracket

• With integrated camshaft bearings
• Removing and installing --> Camshafts, removing and installing

12 - Bolt

• Tightening order --> Bearing frame tightening sequence

13 - Camshaft position (CMP) sensor 2 G163

14 - Bolt

• 9 Nm

15 - O-ring

• Replace

16 - Bolt

• 9 Nm

17 - Camshaft position (CMP) sensor 4 G301

18 - O-ring

• Replace

19 - Compression ring

• For camshaft adjuster

20 - Exhaust camshaft

• Removing and installing --> Camshafts, removing and installing
• Measuring axial play --> Camshaft axial play, measuring
• Measure radial clearance using Plastigage (roller rocker lever removed)
• Radial clearance at bearing-dia. 24 mm: 0.024 to 0.066 mm

• Radial clearance at bearing-dia. 36 mm: 0.032 to 0.078 mm
• Run-out: maximum 0.04 mm

21 - Cylinder head

• Check valve guides --> Valve guides, checking

22 - Intake valve

• Do not rework, only lapping is permitted
• Mark installed position for re-installation
• Valve dimensions --> Valve dimensions
• Check valve guides --> Valve guides, checking

23 - Exhaust valve

• Do not rework, only lapping is permitted
• Mark installed position for re-installation
• Valve dimensions --> Valve dimensions
• Check valve guides --> Valve guides, checking

Audi A8 L Quattro 2007 - Bearing frame tightening sequence

Fig. 338: Audi A8 L Quattro 2007 - Component Locations - Loosen Guide Frame Bolts Sequence

• Tighten bolts in 2 stages in - 1 to 24 - sequence as follows.
• Install bolts by hand as far as stop.
• Tighten bolts to 8 Nm.

Audi A8 L Quattro 2007 - Installed position of valve spring

Fig. 339: Audi A8 L Quattro 2007 - Component Locations - Identifying Tight Spring Coils Face Toward Cylinder Head

• The tight spring coils - arrow - face toward cylinder head.

Audi A8 L Quattro 2007 - Camshaft axial play, measuring

Special tools, testers and auxiliary items required

Fig. 340: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge Holder VW 387

• Dial gauge holder VW 387

Fig. 341: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge VAS 6079

• Dial gauge VAS 6079

Work procedure

• Perform measurement with guide frame removed.

Fig. 342: Audi A8 L Quattro 2007 - Component Locations - Securing Dial Gauge Holder VW 387 To Dial Gauge VAS 6079 On Cylinder Head

• Secure Dial Gauge Holder VW 387 with Dial Gauge VAS 6079 on cylinder head as shown in illustration.
• Determine axial clearance.

• Axial clearance: 0.100 to 0.191 mm.

Audi A8 L Quattro 2007 - Camshafts, removing and installing

Fig. 343: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Camshafts, Removing And Installing

Special tools, testers and auxiliary items required

• Multi-point socket T10035
• Tool set T10133
• Socket T40058
• Securing pins 1 set = qty. 2 T40116

• Hand drill with plastic brush attachment
• Protective glasses
• Sealant

NOTE:

Removal and installation at left cylinder head is depicted in the following description.

Removing

• Remove cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.
• Remove left and right timing chain covers --> Installing.
• Remove camshaft timing chains from camshafts --> Camshaft timing chains, removing from camshafts.

Fig. 344: Audi A8 L Quattro 2007 - Component Locations - Intake Camshaft Position Sensor

• Disconnect electrical connector at intake camshaft position sensor - arrow -.
• Remove high-pressure pump --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 345: Audi A8 L Quattro 2007 - Component Locations - Securing Crankshaft In TDC Position Using Crankshaft Holder 3242

CAUTION:

Risk of damaging valves and piston crowns. In the course of the following steps, the crankshaft must not stand with any piston at "TDC".

• Remove Crankshaft Holder 3242 from upper part of oil pan.

Fig. 346: Audi A8 L Quattro 2007 - Component Locations - Inserting Guide Pin Of Adapter T40058 So Large Diameter Points To Engine

• Insert guide pin of socket T40058 so that large diameter - arrow 1 - points to adapter. Small diameter - arrow 2 - points to engine.

Fig. 347: Audi A8 L Quattro 2007 - Component Locations - Rotating Crankshaft With Socket T40058 Opposite Engine Rotation Direction 40 Degrees Out Of "TDC" Position

• Rotate crankshaft with Socket T40058 opposite engine rotation direction 40? out of "TDC" position - arrow -.

Fig. 348: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Remove Camshaft Clamp T40070 at cylinder head.

Fig. 349: Audi A8 L Quattro 2007 - Component Locations - Loosen Guide Frame Bolts Sequence

• Loosen guide frame bolts in sequence - 24 to 1 -.

NOTE:

Proceed in the same way with right guide frame.

• Carefully remove guide frame.
• Mark camshafts for reinstallation and remove them.

Fig. 350: Audi A8 L Quattro 2007 - Component Locations - Identifying Guide Frame Alignment Pins

NOTE:

Because the special tool cannot be used during installation, the alignment pins - arrows - on an engine with alignment pins must be driven out with a cotter pin driver.

Installing

• Tightening torque --> Bearing frame tightening sequence

NOTE:

Replace seals and sealing rings.

CAUTION:

Risk of eye injury. Wear safety glasses.

CAUTION:

Risk of contaminating lubricating system and bearing. Cover open parts of engine.

• Remove sealant residue on cylinder head and guide frame, e.g. with rotating plastic brush.
• Clean sealing surfaces so they are completely free of any oil or grease.
• Oil journal surfaces of camshafts.
• Place camshafts in cylinder head, noting position of camshafts so that guide frame can be installed without tension.

Fig. 351: Audi A8 L Quattro 2007 - Component Locations - Identifying Intake Camshaft & Exhaust Camshaft (Left Cylinder Head)

Left cylinder head:

1. Intake camshaft
2. Exhaust camshaft

• Groove on end of shaft must lie as shown in illustration.

Fig. 352: Audi A8 L Quattro 2007 - Component Locations - Identifying Intake Camshaft & Exhaust Camshaft (Right Cylinder Head)

Right cylinder head:

1. Exhaust camshaft
2. Intake camshaft

• Groove on end of shaft must lie as shown in illustration.

Continued for both sides:

• Check location of compression ring ends.

Fig. 353: Audi A8 L Quattro 2007 - Component Locations - Identifying Compression Ring Ends Face Upward Or Downward

• The compression ring ends - 1 and 2 - must face upward or downward, and must never face sideways.

Fig. 354: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).

Fig. 355: Audi A8 L Quattro 2007 - Component Locations - Laying New Seal In Guide Frame Groove & Applying Sealant Beads On Clean Guide Frame Sealing Surfaces

• Lay seal - 2 - in guide frame groove.
• Apply sealant beads - 1, 3, 4 - on clean guide frame sealing surfaces as shown in illustration.

• Thickness of sealant beads: 2.5 mm.

CAUTION:

Risk of contaminating camshaft bearing with excess sealant. Do not apply sealant beads thicker than specified.

• Place guide frame on cylinder head.

NOTE:

Ensure camshafts can be inserted in guide frame axial bearing without force.

Fig. 356: Audi A8 L Quattro 2007 - Component Locations - Inserting Guide Frame Securing Pins T40116 In Guide Frame And Cylinder Head

• Insert locating pins T40116 in guide frame and cylinder head.

NOTE:

Because the sealant begins hardening immediately, guide frame must be promptly positioned and tightened. After the guide frame has been installed, sealant must dry approx. 30 minutes.

Fig. 357: Audi A8 L Quattro 2007 - Component Locations - Bearing Frame Tightening Sequence

• Tighten guide frame bolts --> Bearing frame tightening sequence

Fig. 358: Audi A8 L Quattro 2007 - Component Locations - Driving Sealing Plugs In Flush

• Drive sealing plugs - arrows - in flush.

Fig. 359: Audi A8 L Quattro 2007 - Component Locations - Removing Guide Frame Securing Pins T40116 With Impact Puller T10133/3

• Remove locating pins T40116 with impact puller T10133/3.

Fig. 360: Audi A8 L Quattro 2007 - Component Locations - Rotating Intake Camshaft To "TDC" And Tightening Camshaft Adjuster Screw On Camshaft With A Socket SW 24 Inserted Between

• Rotate intake camshaft to "TDC" and tighten camshaft adjuster screw - 2 - on camshaft with a socket SW 24 - 1 - inserted between.

NOTE:

Use pliers to counterhold socket when tightening bolt.

• Position a lever or ratchet with Socket T10035 on screw and rotate camshaft until threaded holes for Camshaft Clamp T40070 face up.
• Next, loosely fasten Camshaft Clamp T40070 to intake camshaft.

• The Camshaft Locating Tool T40070 is correctly positioned when the holes for the cylinder head bolts remain free.

Fig. 361: Audi A8 L Quattro 2007 - Component Locations - Adapting Camshaft Adjuster Screw And Socket 24 To Exhaust Camshaft

• Adapt camshaft adjuster screw - 2 - and socket 24 - 1 - to exhaust camshaft.
• Rotate exhaust camshaft until threaded hole for Camshaft Clamp T40070 faces up.
• At the same time, position a counter-hole SW 24 on Camshaft Clamp T40070 and swing Camshaft Clamp T40070 against exhaust camshaft to install - arrow -.
• Tighten Camshaft Clamp T40070 by hand onto exhaust camshaft to avoid damaging threads (2nd technician needed).

Fig. 362: Audi A8 L Quattro 2007 - Component Locations - Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads And Tightening Bolts

• Tighten Camshaft Clamp T40070 bolts to 25 Nm.

Fig. 363: Audi A8 L Quattro 2007 - Component Locations - Using Socket T40058 To Rotate Crankshaft To TDC

• Using Socket T40058 , rotate crankshaft in direction of engine rotation - arrow - to "TDC".

CAUTION:

Risk of injury when touching "TDC" hole with finger. Do not rotate crankshaft - 1 -.

Fig. 364: Audi A8 L Quattro 2007 - Component Locations - Securing Crankshaft In TDC Position Using Crankshaft Holder 3242

• Install crankshaft holder 3242 into hole to 20 Nm, if necessary rotate crankshaft very slightly back and forth to completely center holder.

The rest of installation is in reverse order of removal, note the following:

• Install high pressure pump --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Position camshaft timing chains on camshafts --> Installing.
• Install left and right timing chain covers --> Installing.
• Install cylinder head covers: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

CAUTION:

Risk of damaging valves and piston heads after working on valvetrain. The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves. To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

Audi A8 L Quattro 2007 - Support elements with hydraulic adjustment, checking

NOTE:

The support elements with hydraulic adjustment cannot be serviced. Irregular valve noises are normal while starting the engine.

Special tools, testers and auxiliary items required

Fig. 365: Audi A8 L Quattro 2007 - Component Locations - Socket T40058

• Socket T40058
• Feeler gauge

Work procedure

• Start engine and allow it to run until coolant fan has switched on once.
• Increase RPM to approx. 2500 for 2 minutes and perform road test if necessary.

NOTE:

If irregular valve noises disappear but return during short drives, oil check valve must be replaced. Oil check valve location --> Oil check valve and spray nozzle valve, assembly overview. If support elements with hydraulic adjustment are still loud, locate faulty support element as follows: Remove cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

Fig. 366: Audi A8 L Quattro 2007 - Component Locations - Inserting Guide Pin Of Adapter T40058 So Large Diameter Points To Engine

• Insert guide pin of socket T40058 so that large diameter - arrow 1 - points to engine. Small diameter - arrow 2 - points to adapter.

Fig. 367: Audi A8 L Quattro 2007 - Component Locations - Using Socket T40058 To Rotate Crankshaft To TDC

• Rotate crankshaft until cam lobes on support element to be checked point upward.

Fig. 368: Audi A8 L Quattro 2007 - Component Locations - Checking Play Between Cam Lobes And Roller Rocker Lever

• To determine play between cam lobes and roller rocker lever, press lever down - arrow -.
• If a 0.20 mm feeler gauge can slide between cam lobes and roller rocker lever, replace support element --> Camshafts, removing and installing.

Final procedures

• Install cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

Audi A8 L Quattro 2007 - Valve stem seals, replacing

Fig. 369: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Valve Stem Seals, Replacing

Special tools, testers and auxiliary items required

• Spark plug removal tool 3122 B
• Valve seal removal tool 3364
• Valve stem seal driver 3365
• Valve cotter disassembly and assembly device VAS 5161

• Adapter T40012

Removing

• Remove camshaft timing chains from camshafts --> Camshaft timing chains, removing from camshafts.
• Remove camshafts --> Camshafts, removing and installing.
• Using spark plug removal tool 3122 B , remove spark plugs.

Fig. 370: Audi A8 L Quattro 2007 - Component Locations - Placing Drift VAS 5161/3 On Valve Spring Plate And Loosening Stuck Valve Keepers Using Plastic Hammer

• Place drift VAS 5161/3 on valve spring plate and loosen stuck valve keepers using a plastic hammer.

Fig. 371: Audi A8 L Quattro 2007 - Component Locations - Placing Guide Plate VAS 5161/19 A From Valve Cotter Disassembly And Assembly Device VAS 5161 On Cylinder Head

• Place guide plate VAS 5161/19A from Valve Cotters Asm/Dis-Asm Device VAS 5161 on cylinder head.
• Secure guide plate with knurled screws VAS 5161/12.
• Install adapter T40012 with gasket by hand into respective spark plug thread and apply constant pressure.

• Minimum pressure: 6 bar positive pressure.

Fig. 372: Audi A8 L Quattro 2007 - Component Locations - Installing Engaging Device VAS 5161/6 With Installation Fork VAS 5161/5 Into Guide Plate

• Secure engaging device VAS 5161/6 with installation fork VAS 5161/5 to guide plate.
• Push installation cartridge VAS 5161/8 into guide plate.
• Engage pressure fork VAS 5161/2 at engaging device and press down installation cartridge.
• At the same time, turn knurled bolt of installation cartridge to the right, until the points engage in the valve keepers.

• Lightly move knurled bolt back and forth, causing the valve keepers to be pressed apart and be captured in the installation cartridge.
• Release pressure fork.
• Take out installation cartridge.
• Unfasten guide plate and turn it aside.

• Pressurized air hose remains connected.

• Remove valve spring with valve spring plate.

Fig. 373: Audi A8 L Quattro 2007 - Component Locations - Removing Valve Stem Oil Seals Using Valve Seal Removal Tool 3364

• Remove valve stem seal with Valve Seal Removal Tool 3364.

If Valve Seal Removal Tool 3364 cannot be used on some valve stem seals due to restricted clearance, proceed as follows:

Fig. 374: Audi A8 L Quattro 2007 - Component Locations - Using Drift To Drive Out Roll Pin At Puller With Drift And Removing Impact Puller Attachment

• Using a drift, drive out roll pin - arrow - at puller with a drift and remove the impact puller attachment.
• Place lower part of puller on valve stem seal.

Fig. 375: Audi A8 L Quattro 2007 - Component Locations - Securing Valve Seal Removal Tool 3364 With Drift Or Cotter Pin Driver

• Secure puller with a drift or cotter pin driver - 1 - , as shown in illustration.
• Place lever on puller and pull off valve stem seal - arrow -.

Installing

CAUTION:

Risk of damage when installing valve stem seals. Place plastic sleeve - A - that is attached to valve stem seals - B - on valve stem.

• Lightly coat sealing lips of valve stem seal with oil.
• Push valve stem seal onto plastic sleeve.

Fig. 376: Audi A8 L Quattro 2007 - Component Locations - Identifying Plastic Sleeve, Valve Stem Oil Seal & Valve Stem Seal Driver 3365

• Carefully press valve stem oil seal onto valve guide using valve stem seal driver 3365.
• Remove plastic sleeve again.

Fig. 377: Audi A8 L Quattro 2007 - Component Locations - Identifying Installation Cartridge VAS 5161/8

If valve keepers were removed from installation cartridge, they must then be inserted into insertion device VAS 5161/18.

• The large diameter of valve keepers point upward.

• Install valve spring and valve spring plate.

Fig. 378: Audi A8 L Quattro 2007 - Component Locations - Identifying Tight Spring Coils Face Toward Cylinder Head

• The tight spring coils - arrow - face toward cylinder head.

Fig. 379: Audi A8 L Quattro 2007 - Component Locations - Installing Engaging Device VAS 5161/6 With Installation Fork VAS 5161/5 Into Guide Plate

• Install guide plate onto cylinder head again.
• Insert installation cartridge into guide plate.
• Press down pressure fork and pull knurled bolt upward turning to left and right, valve keepers are inserted in this manner.
• Release pressure fork with knurled bolt still pulled.

• Ensure that all roller rocker levers seat properly on valve stem ends and are clipped onto respective support elements.
• Install sparks plugs 404.
• Install camshafts --> Camshafts, removing and installing.
• Position camshaft timing chains on camshafts --> Installing.

• Install left and right timing chain covers --> Installing.
• Install cylinder head cover: Left --> Left cylinder head cover, removing and installing , right --> Right cylinder head cover, removing and installing.

CAUTION:

Risk of damaging valves and piston heads after working on valvetrain. The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves. To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

Audi A8 L Quattro 2007 - Valve dimensions

Fig. 380: Audi A8 L Quattro 2007 - Component Locations - Valve Dimensions

NOTE:

Intake and exhaust valves must not be refaced by grinding. Only lapping is permitted.

Dimension	Intake valve	Exhaust valve
Dia. a	mm	33.85 ? 0.10	28.0 ? 0.1
Dia. b	mm	5.98 ? 0.01	5.96 ? 0.01
c	mm	103.97 ? 0.20	101.9 ? 0.2
?	Angle?	45	45

CAUTION:

Risk of injury if exhaust valves with sodium filling are disposed of improperly. Cut exhaust valve with sodium filling into 2 parts with a metal saw between shaft center and valve plate. While doing this, do not come into contact with water. Throw at the most 10 such sawed exhaust valves in a bucket filled with water and step back immediately. When there is contact with water, a sudden chemical reaction occurs which burns the sodium filling. The treated parts may then be discarded through conventional disposal channels.

Audi A8 L Quattro 2007 - Valve guides, checking

Special tools, testers and auxiliary items required

Fig. 381: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge Holder VW 387

• Dial gauge holder VW 387

Fig. 382: Audi A8 L Quattro 2007 - Component Locations - Dial Gauge VAS 6079

• Dial gauge VAS 6079

Work procedure

NOTE:

If valve is replaced during repair, use new valve for measurement. Due to different stem diameters, only use an intake valve in the intake guide and an exhaust valve in the exhaust guide. Insert valve into valve guide. Valve stem tip must seal with valve guide.

Fig. 383: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tool - VW 387 Installed

• Determine tilt clearance.

• Wear limit: 0.8 mm.

• If wear limit is exceeded, re-measure using new valves.
• If wear limit is still exceeded, replace cylinder head.

NOTE:

The valve guides cannot be replaced.

Audi A8 L Quattro 2007 - Valves, checking

• Check valves at stem and seating surface for traces of wear.
• If there are clear traces of wear, replace valve.

Audi A8 L Quattro 2007 - 17 - Engine - Lubrication Oil pump and lower part of oil pan Oil pump and lower part of oil pan

NOTE:

If a large amount of metal shavings or particles are found when performing engine repairs, these could indicate crankshaft or rod bearings are damaged. To prevent subsequent damage, the following work must be performed after the repair: Oil channels must be cleaned carefully; replace oil spray jets, oil cooler and oil filter. Viscosity classes, oil specifications, oil capacities Maintenance tables.

CAUTION:

Danger of catalytic converter damage. Oil level must not exceed "max" marking.

Audi A8 L Quattro 2007 - Oil pump and lower part of oil pan, assembly overview

Fig. 384: Audi A8 L Quattro 2007 - Component Locations - Oil Pump And Lower Part Of Oil Pan, Assembly Overview

1 - Bolt

• 9 Nm

2 - Oil pan (lower section)

• Removing and installing --> Lower part of oil pan, removing and installing

3 - Bolt

• 9 Nm

4 - Oil pipe

5 - Gasket

• Replace

6 - O-ring

• Replace

7 - Bolt

• 9 Nm

8 - Bolt

• 9 Nm

9 - Oil check valve housing

10 - Gasket

• Replace

11 - Oil check valve

12 - O-ring

• Replace

13 - Oil pipe

14 - Bolt

• 9 Nm

15 - O-ring

• Replace

16 - Drive shaft for coolant pump

17 - Fitting sleeves

• 2 pieces

18 - Oil pump

• Do not disassemble
• With relief valve approx. 5.5 bar
• Removing and installing --> Oil pump, removing and installing

19 - Drive shaft for oil pump

20 - Bolt

• Replace
• 8 Nm additional 90? (¹ /₄ turn).

21 - Gasket

• Replace

22 - Intake tube

• For oil pump

23 - Bolt

• 9 Nm

24 - Oil strainer

• Clean

25 - Oil baffle

26 - Bolt

• 9 Nm

27 - Seal

• Replace

28 - Oil Level Thermal Sensor G266

29 - Bolt

• 9 Nm

30 - Oil drain plug

• 25 Nm

31 - Seal

• Replace

Audi A8 L Quattro 2007 - Lower part of oil pan, tightening sequence

Fig. 385: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Level Thermal Sensor G266 Electrical Connector & Oil Pan (Lower Part)

• Tighten bolts in 3 stages as follows:
• Tight bolts by hand in a diagonal sequence.
• Pre-tighten all bolts in a diagonal sequence to 5 Nm.
• Tighten bolts diagonally to 9 Nm.

Audi A8 L Quattro 2007 - Lower part of oil pan, removing and installing

Special tools, testers and auxiliary items required

Fig. 386: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782
• Hand drill with plastic brush attachment
• Protective glasses
• Sealant

Audi A8 L Quattro 2007 - Removing

• Drain coolant --> Cooling system, draining and filling.
• Remove front coolant pipe --> Front coolant line, removing and installing.

Fig. 387: Audi A8 L Quattro 2007 - Component Locations - ATF Line Bracket Nuts

• Remove nuts - 1 and 2 -.
• Remove ATF line bracket.

Fig. 388: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Level Thermal Sensor G266 Electrical Connector & Oil Pan (Lower Part)

• Disconnect electrical connector - 1 - at Oil Level Thermal Sensor G266.
• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Unbolt oil pan (lower part) - 2 - and pry out carefully.

NOTE:

There is still a residual amount of oil in lower section of oil pan.

Audi A8 L Quattro 2007 - Installing

• Tightening torque --> Lower part of oil pan, tightening sequence

NOTE:

Replace sealing rings.

CAUTION:

Risk of eye injury. Wear safety glasses.

CAUTION:

Risk of contaminating lubricating system and bearing. Cover open parts of engine.

Fig. 389: Audi A8 L Quattro 2007 - Component Locations - Removing Remaining Sealant From Lower And Upper Part Of Oil Pan Using E.G. Rotating Plastic Brush

• Remove sealant residue lower part and upper part of oil pan, e.g. with rotating plastic brush.
• Clean sealing surfaces so they are completely free of any oil or grease.

Fig. 390: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).

Fig. 391: Audi A8 L Quattro 2007 - Component Locations - Applying Sealant Bead On Clean Sealing Surface Of Lower Part Of Oil Pan

• Apply sealant bead - arrow - on clean sealing surface of lower part of oil pan as shown in illustration.

• Thickness of sealant bead: 2.5 mm.

CAUTION:

Risk of plugging oil pump strainer with excess sealant. Do not apply sealant bead thicker than indicated.

NOTE:

The oil pan (lower part) must be installed within 5 minutes after application of sealant.

• Position lower part of oil pan and tighten bolts --> Lower part of oil pan, tightening sequence

The rest of installation is in reverse order of removal, note the following:

• Install front coolant pipe --> Front coolant line, removing and installing.
• Add engine oil and check oil level --> Oil level, checking.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Oil pump, removing and installing

Special tools, testers and auxiliary items required

Fig. 392: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782

Fig. 393: Audi A8 L Quattro 2007 - Component Locations - Long-Nose Gripping Pliers VAS 6226

• Long-nose gripping pliers VAS 6226

Removing

• Drain coolant --> Cooling system, draining and filling.
• Remove front coolant pipe --> Front coolant line, removing and installing.
• Remove coolant pump --> Coolant pump, removing and installing.
• Remove lower section of oil pan --> Lower part of oil pan, removing and installing.

Fig. 394: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Drive Shaft For Coolant Pump From Oil Pump

• Remove drive shaft - arrow - for coolant pump from oil pump.

Fig. 395: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts And Oil Pipe

• Place old oil collecting and extracting device V.A.G 1782 under engine.
• Remove bolts - arrows - and remove oil pipe.

NOTE:

Oil escapes when removing oil pipes.

Fig. 396: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Intake Tube

• Remove bolts - arrows - and remove intake tube.

Fig. 397: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Pipe With Oil Check Valve Housing

• Remove oil pipe together with oil check valve housing.

NOTE:

Oil escapes when removing oil pipes.

Fig. 398: Audi A8 L Quattro 2007 - Component Locations - Pressing Back Drive Shaft For Oil Pump Against Spring Force And Clamping Tightly Using Long-Nose Gripping Pliers VAS 6226

• Press back drive shaft - 1 - for oil pump against spring force and clamp tightly using Long-nose gripping pliers VAS 6226.

Fig. 399: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Oil Pump

• Remove bolts - arrows - and remove oil pump.

Installing

• Tightening torques --> Oil pump and lower part of oil pan, assembly overview.

NOTE:

Replace sealing rings and O-rings.

• Check whether 2 alignment bushings are present in cylinder block, install if necessary.
• Tighten oil pump - arrows -.

Fig. 400: Audi A8 L Quattro 2007 - Component Locations - Pressing Back Drive Shaft For Oil Pump Against Spring Force And Clamping Tightly Using Long-Nose Gripping Pliers VAS 6226

• Unlock Long-nose gripping pliers VAS 6226 and let drive shaft - 1 - glide into oil pump.

Fig. 401: Audi A8 L Quattro 2007 - Component Locations - Checking Whether Drive Shaft Is Friction Locked To Oil Pump

• Check whether drive shaft is friction locked to oil pump. To do so, reach into intake opening - arrow - of oil pump and try to rotate oil pump gears.

• Toothed gears must not be able to be rotated.

The rest of installation is in reverse order of removal, note the following:

• Install coolant pump --> Coolant pump, removing and installing.
• Install lower section of oil pan --> Installing.
• Install front coolant pipe --> Front coolant line, removing and installing.
• Add engine oil and check oil level --> Oil level, checking.

• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Oil pan (upper section) Upper part of oil pan, assembly overview

Fig. 402: Audi A8 L Quattro 2007 - Component Locations - Upper Part Of Oil Pan, Assembly Overview

1 - Seals

• Replace

2 - O-ring

• Replace

3 - Seals

• Replace

4 - O-ring

• Replace

5 - Oil pan (upper section)

• Removing and installing --> Upper part of oil pan, removing and installing

6 - Bolt

• Tightening order --> Upper part of oil pan, tightening sequence

7 - Seal

• Replace

8 - Locking bolt

• 35 Nm

Audi A8 L Quattro 2007 - Upper part of oil pan, tightening sequence

Fig. 403: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Upper Section Of Oil Pan

• Tighten bolts - 1 through 7 - in 2 stages as follows:
• Pre-tighten all bolts in a diagonal sequence to 5 Nm.
• Tighten bolts diagonally to 14 Nm.

Audi A8 L Quattro 2007 - Upper part of oil pan, removing and installing

Special tools, testers and auxiliary items required

Fig. 404: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782
• Protective glasses
• Hand drill with plastic brush attachment
• Sealant

Removing

Fig. 405: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove sound insulation by loosening fasteners - 1, 2, 4 -.

NOTE:

Ignore - 3 -.

• Place old oil collecting and extracting device V.A.G 1782 under engine and drain engine oil.
• Remove engine --> Engine, removing.
• Separate engine and transmission --> Engine and transmission, separating.
• Secure engine to assembly stand --> Engine, securing to assembly stand.

• Remove drive plate --> Drive plate, removing and installing.
• Remove left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Remove oil filter housing --> Oil filter housing, removing and installing.

• Remove lower timing chain cover --> Timing chain lower cover, removing and installing.
• Remove ribbed belt tensioner --> Ribbed belt, removing and installing.
• Remove front coolant pipe --> Front coolant line, removing and installing.
• Remove generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .

Fig. 406: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Air Generator Bracket

• Remove bolts - arrows - and remove air generator bracket.

Fig. 407: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Level Thermal Sensor G266 Electrical Connector & Oil Pan (Lower Part)

• Disconnect electrical connector - 1 - at Oil Level Thermal Sensor G266.
• Place old oil collecting and extracting device V.A.G 1782 under engine.

NOTE:

There is still a residual amount of oil in lower section of oil pan.

• Remove oil pan (lower part) - 2 - and pry out carefully.
• Remove oil pump --> Oil pump, removing and installing.

Fig. 408: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Upper Section Of Oil Pan

• Remove bolts - 1 to 7 - for upper section of oil pan.
• Press upper part of oil pan from alignment pins of cylinder block.

Installing

• Tightening torques --> Ribbed belt drive, assembly overview , Upper part of oil pan, tightening sequence

NOTE:

Replace sealing rings and O-rings.

CAUTION:

Risk of eye injury. Wear safety glasses.

Fig. 409: Audi A8 L Quattro 2007 - Component Locations - Using Rotating Plastic Brush To Remove Remaining Sealant From Oil Pan (Upper Part) And At Cylinder Block

• Using rotating plastic brush, remove any remaining sealant from oil pan (upper part) and at cylinder block.
• Clean sealing surfaces so they are completely free of any oil or grease.

Fig. 410: Audi A8 L Quattro 2007 - Component Locations - Cutting Tube Nozzle At Front Marking

• Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 1 mm).

Fig. 411: Audi A8 L Quattro 2007 - Component Locations - Inserting New Seals Into Grooves On Cylinder Block

• Insert new seals - 1 to 4 - into grooves on cylinder block.

Fig. 412: Audi A8 L Quattro 2007 - Component Locations - Applying Sealant Beads On Clean Sealing Surfaces Of Upper Part Of Oil Pan

• Apply sealant beads - 1 and 2 - on clean sealing surfaces of upper part of oil pan, as shown in illustration.

• Thickness of sealant beads: 2.5 mm.

CAUTION:

Risk of plugging oil pump strainer with excess sealant. Do not apply sealant bead thicker than specified.

NOTE:

The oil pan (upper part) must be installed within 5 minutes after application of sealant.

Fig. 413: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts For Upper Section Of Oil Pan

• Position lower part of oil pan and tighten bolts --> Upper part of oil pan, tightening sequence

The rest of installation is in reverse order of removal, note the following:

• Install oil pump --> Oil pump, removing and installing.
• Install coolant pump --> Coolant pump, removing and installing.
• Install lower section of oil pan --> Installing.
• Install front coolant pipe --> Front coolant line, removing and installing.

• Install ribbed belt tensioner --> Ribbed belt, removing and installing.
• Install generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Install lower timing chain cover --> Timing chain lower cover, removing and installing.
• Install crankshaft seal, transmission side --> Transmission-side crankshaft sealing ring, replacing.

• Install oil filter housing --> Oil filter housing, removing and installing.
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left and right timing chain covers --> Left and right timing chain covers, removing and installing.
• Install drive plate --> Drive plate, removing and installing.

• Install engine --> Engine, installing.
• Add engine oil and check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Oil check valve, spray nozzle valve, oil filter housing, oil cooler, oil pressure switch Oil check valve and spray nozzle valve, assembly overview

Fig. 414: Audi A8 L Quattro 2007 - Component Locations - Oil Check Valve And Spray Nozzle Valve, Assembly Overview

1 - O-ring

• Replace

2 - Spray nozzle valve

• Removing and installing --> Oil check valve and spray nozzle valve, removing and installing

3 - Gasket

• Replace

4 - Cover

5 - O-ring

• Replace

6 - Hose

• For crankcase ventilation

7 - Bolt

• 9 Nm

8 - Bolt

• 9 Nm

9 - Oil check valve

• Removing and installing --> Oil check valve and spray nozzle valve, removing and installing

10 - O-ring

• Replace

Audi A8 L Quattro 2007 - Oil check valve and spray nozzle valve, removing and installing

NOTE:

If irregular valve noises disappear after a long drive but always return on short drives, oil check valve must be replaced.

Removing

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 415: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts On High Pressure Line Retaining Clamps, Fuel Injectors Electrical Harness Connectors & High Pressure Lines

• Remove bolts - 1, 4, 5, 6, 7 - on high pressure line retaining clamps.
• Disconnect electrical harness connectors at fuel injectors.
• Remove high pressure lines - 2 and 9 - from connections on fuel rail.
• Remove high pressure lines - 3 and 8 - from connections on fuel rail. To do this, counterhold at hex head with and open-end wrench and loosen the union nut.

• Remove high pressure lines.

Fig. 416: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts & Cover With Crankcase Ventilation Hose

• Remove bolts - arrows -.
• Remove cover - 2 - with crankcase ventilation hose - 1 -.
• Remove seal.

Fig. 417: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Check Valve And Spray Nozzle Valve

• Remove oil check valve - 1 - and spray nozzle valve - 2 -.

Installing

• Tightening torques --> Oil check valve and spray nozzle valve, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and O-rings.

• Install high pressure lines --> 24 - MULTIPORT FUEL INJECTION (MFI) as described under "Fuel injectors, removing and installing".
• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Audi A8 L Quattro 2007 - Crankcase ventilation hose, removing and installing

Removing

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 418: Audi A8 L Quattro 2007 - Component Locations - Removing Bolt And Crankcase Ventilation Hose From Cover

• Remove bolt - arrow - and remove crankcase ventilation hose - 1 - from cover - 2 -.

Installing

• Tightening torque --> Oil check valve and spray nozzle valve, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace O-ring.

• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Audi A8 L Quattro 2007 - Oil filter housing, assembly overview

Fig. 419: Audi A8 L Quattro 2007 - Component Locations - Oil Filter Housing, Assembly Overview

1 - Gasket

• Replace

2 - Bolt

• 9 Nm

3 - Oil filter housing

• With oil filter by-pass valve 1.3 bar

4 - Bolt

• 22 Nm

5 - Oil filter element

• Replace O-ring - 6 - when filter is changed
• Observe change intervals 404

6 - O-ring

• Replace

7 - Cap

• 25 Nm

8 - Bolt

• 9 Nm

9 - Bracket

• For evaporative emission (EVAP) canister purge regulator valve N80

10 - Locking bolt

• 50 Nm

11 - Locking bolt

• 9 Nm

12 - Seal

• Replace

13 - O-ring

• Replace

Audi A8 L Quattro 2007 - Oil cooler

Fig. 420: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Cooler

Bolts - arrows -

• 9 Nm

Audi A8 L Quattro 2007 - Oil pressure switch F1

Fig. 421: Audi A8 L Quattro 2007 - Component Locations - Identifying Electrical Harness Connector For Oil Pressure Switch F1 And Oil Pressure Switch

Oil Pressure Switch F1 - 1 -

• 20 Nm
• Replace seal

Audi A8 L Quattro 2007 - Oil filter housing, removing and installing

Removing

• Remove intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .

NOTE:

To collect escaping engine oil, place a clean cloth around oil filter housing.

• Remove cover and remove oil filter insert.

Fig. 422: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Oil Filter Housing

• Remove bolts - arrows - and remove oil filter housing.

Installing

• Tightening torques --> Oil filter housing, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace sealing rings and O-rings.

• Install intake manifold --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Check oil level --> Oil level, checking.

Audi A8 L Quattro 2007 - Oil cooler, removing and installing

Special tools, testers and auxiliary items required

Fig. 423: Audi A8 L Quattro 2007 - Component Locations - Hose Clamps Up To 25 Mm Dia. 3094

• Hose clamps up to 25 mm dia. 3094

Fig. 424: Audi A8 L Quattro 2007 - Component Locations - Identifying Old Oil Collecting And Extracting Device V.A.G 1782

• Old oil collecting and extracting device V.A.G 1782

Removing

• Drain coolant --> Cooling system, draining and filling.
• Remove generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .

Fig. 425: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts And Air Generator Bracket

• Remove bolts - arrows - and remove air generator bracket.

Fig. 426: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Cooler

• Clamp off coolant hoses with hose clamps 3094 as shown in illustration.

NOTE:

Lay a cloth below to catch escaping coolant.

• Remove coolant hoses - 1 and 2 - from oil cooler.
• Place old oil collecting and extracting device V.A.G 1782 under engine.
• Remove bolts - arrows - and remove oil cooler.

Installing

• Tightening torques --> Ribbed belt drive, assembly overview , --> Oil filter housing, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace O-rings. Secure all hose connections using hose clamps appropriate for the model type .

• Install generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Check coolant level --> Filling.

Audi A8 L Quattro 2007 - Oil Pressure Switch F1 , removing and installing

Removing

• Bring lock carrier into service position --> 50 - BODY - FRONT .

Fig. 427: Audi A8 L Quattro 2007 - Component Locations - Identifying Electrical Harness Connector For Oil Pressure Switch F1 And Oil Pressure Switch

• Disconnect electrical connector - 2 - on Oil Pressure Switch F1 - 1 -.
• Remove Oil Pressure Switch F1.

Installing

• Tightening torque --> Oil filter housing, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace sealing ring. Secure all hose connections using hose clamps appropriate for the model type .

• Install lock carrier with attachments --> 50 - BODY - FRONT .

Audi A8 L Quattro 2007 - Oil pressure and oil pressure switch F1 , checking

Fig. 428: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Oil Pressure And Oil Pressure Switch F1 , Checking

Special tools, testers and auxiliary items required

• Oil pressure gauge V.A.G 1342 with adapter V.A.G 1342/14
• Voltage tester V.A.G 1527B
• Connector test set V.A.G 1594C

Work procedure

• Oil level OK
• Engine oil temperature approximately 80? C.

• Remove Oil Pressure Switch F1 --> Oil Pressure Switch F1 , removing and installing.

Fig. 429: Audi A8 L Quattro 2007 - Component Locations - Connecting Oil Pressure Gauge V.A.G 1342 With Adapter V.A.G 1342/14 To Hole For Oil Pressure Switch

• Connect oil pressure gauge V.A.G 1342 with adapter V.A.G 1342/14 to hole for oil pressure switch.
• Install oil pressure switch - 2 - into oil pressure gauge V.A.G 1342.
• Place brown wire of oil pressure gauge on Ground (GND) ("").

Oil pressure switch, checking

• Connect voltage tester V.A.G 1527B using adapter cables from connector test kit V.A.G 1594C to oil pressure switch and battery plus ("+").

• LED must not light up.

If LED lights up:

• Replace Oil Pressure Switch.
• Start engine.

NOTE:

While starting engine, watch Pressure Tester and LED as oil pressure switch may open during start. At 1.2 to 1.6 bar pressure, LED must light up.

If LED does not light up:

• Replace Oil Pressure Switch.

Oil pressure, checking

• Start engine.

• Oil pressure at idle: at least 1.5 bar.
• Oil pressure at 2000 RPM: at least 3.5 bar.

If specifications are not obtained: Check-valve or oil pump malfunctioning.

• Replace oil pump --> Oil pump, removing and installing.

Assembling

• Install Oil Pressure Switch F1 --> Oil Pressure Switch F1 , removing and installing.

Audi A8 L Quattro 2007 - Engine oil

Viscosity classes, oil specifications, oil capacities Maintenance tables.

Audi A8 L Quattro 2007 - Oil level, checking

NOTE:

Oil level must not exceed "max" marking danger of catalytic converter damage!

Work procedure

• Engine oil temperature at least 60? C.
• Vehicle in level position.
• After stopping engine, wait a few minutes to allow oil to flow back into oil pan.

• Pull out oil dipstick, wipe off with a clean cloth and re-insert dipstick again up to stop.
• Withdraw dipstick again and read oil level.

Audi A8 L Quattro 2007 - Range of markings on dipstick:

Fig. 430: Audi A8 L Quattro 2007 - Component Locations - Range Of Markings On Dipstick

a - Oil must not be added.

b - Oil may be topped off.

c - Oil must be added.

NOTE:

Oil level must not exceed max. marking - a - and must not fall short of min. marking - c -.

Audi A8 L Quattro 2007 - 19 - Engine - Cooling system Cooling system Cooling system

CAUTION:

Risk of scalding due to hot steam and hot coolant. When the engine is warm the cooling system is under pressure. To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

NOTE:

Secure all hose connections using hose clamps appropriate for the model type . The arrows on the coolant pipes and ends of coolant hoses must align.

Audi A8 L Quattro 2007 - Coolant hose connection diagrams Vehicles without auxiliary heater

Fig. 431: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose Connection Diagrams - Vehicles Without Auxiliary Heater

1 - Radiator

• Removing and installing --> Radiator, removing and installing
• Change coolant after replacing

2 - ATF cooler

• Removing and installing --> 37 - CONTROLS, HOUSING
• Change coolant after replacing

3 - Coolant thermostat

• For ATF cooler

4 - Generator

5 - Oil cooler

• Removing and installing --> Oil cooler, removing and installing
• Change coolant after replacing

6 - Cylinder head and cylinder block

• Change coolant after replacing

7 - Engine Coolant Temperature (ECT) Sensor G62

• Removing and installing --> Engine Coolant Temperature (ECT) Sensor G62 , removing and installing

8 - Throttle valve connection

9 - Bleeder screw

• In coolant hose to heater core

10 - Heater core

• Change coolant after replacing

11 - Bleeder screw

• In coolant hose from heater core

12 - Cap

• Pressure relief valve, checking --> Pressure relief valve in cap, checking

13 - Coolant expansion tank

14 - Map Controlled Engine Cooling Thermostat F265

• Removing and installing --> Map Controlled Engine Cooling Thermostat F265 , removing and installing

15 - Coolant pump

• Removing and installing --> Coolant pump, removing and installing

Audi A8 L Quattro 2007 - Vehicles with auxiliary heater

Fig. 432: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose Connection Diagrams - Vehicles With Auxiliary Heater

1 - Radiator

• Removing and installing --> Radiator, removing and installing
• Change coolant after replacing

2 - ATF cooler

• Removing and installing --> 37 - CONTROLS, HOUSING
• Change coolant after replacing

3 - Coolant thermostat

• For ATF cooler

4 - Generator

5 - Engine Coolant (EC) Switch-off Valve (heater) N279

6 - Recirculation Pump V55

• Removing and installing --> 87 - AIR CONDITIONING

7 - Auxiliary heater

8 - Oil cooler

• Removing and installing --> Oil cooler, removing and installing
• Change coolant after replacing

9 - Engine Coolant Temperature (ECT) Sensor G62

• Removing and installing --> Engine Coolant Temperature (ECT) Sensor G62 , removing and installing

10 - Throttle valve connection

11 - Bleeder screw

• In coolant hose to heater core

12 - Heater core

• Change coolant after replacing

13 - Bleeder screw

• In coolant hose from heater core

14 - Cap

• Pressure relief valve, checking --> Pressure relief valve in cap, checking

15 - Coolant expansion tank

16 - Cylinder head and cylinder block

• Change coolant after replacing

17 - Map Controlled Engine Cooling Thermostat F265

• Removing and installing --> Map Controlled Engine Cooling Thermostat F265 , removing and installing

18 - Coolant pump

• Removing and installing --> Coolant pump, removing and installing

Audi A8 L Quattro 2007 - Vehicles with auxiliary cooler

Fig. 433: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose Connection Diagrams - Vehicles With Auxiliary Cooler

1 - Auxiliary cooler

2 - ATF cooler

• Removing and installing --> 37 - CONTROLS, HOUSING
• Change coolant after replacing

3 - Coolant thermostat for ATF cooler and auxiliary cooler

4 - Generator

5 - Oil cooler

• Removing and installing --> Oil cooler, removing and installing
• Change coolant after replacing

6 - Cylinder head and cylinder block

• Change coolant after replacing

7 - Engine Coolant Temperature (ECT) Sensor G62

• Removing and installing --> Engine Coolant Temperature (ECT) Sensor G62 , removing and installing

8 - Throttle valve connection

9 - Bleeder screw

• In coolant hose to heater core

10 - Heater core

• Change coolant after replacing

11 - Bleeder screw

• In coolant hose from heater core

12 - Cap

• Pressure relief valve, checking --> Pressure relief valve in cap, checking

13 - Coolant expansion tank

14 - Map Controlled Engine Cooling Thermostat F265

• Removing and installing --> Map Controlled Engine Cooling Thermostat F265 , removing and installing

15 - Coolant pump

• Removing and installing --> Coolant pump, removing and installing

16 - Radiator

• Removing and installing --> Radiator, removing and installing
• Change coolant after replacing

Audi A8 L Quattro 2007 - Cooling system, draining and filling

Fig. 434: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Cooling System, Draining And Filling

Special tools, testers and auxiliary items required

• Adapter V.A.G 1274/8
• Drip tray for workshop crane VAS 6208
• Hose clamp pliers V.A.G 1921
• Cooling system charge unit VAS 6096

• Refractometer T10007

Special tools, testers and auxiliary items required

Fig. 435: Audi A8 L Quattro 2007 - Component Locations - Adapter V.A.G 1274 Tester V.A.G 1274/10

• Adapter V.A.G 1274 tester V.A.G 1274/10

Audi A8 L Quattro 2007 - Draining

NOTE:

Drained coolant must be stored in a clean container for disposal or reuse.

CAUTION:

Risk of scalding due to hot steam and hot coolant. When the engine is warm the cooling system is under pressure. To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

Fig. 436: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

• Place drip tray for workshop crane VAS 6208 under engine.

Fig. 437: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Coolant Thermostat Housing

• Remove drain plug - 1 - on Map Controlled Engine Cooling Thermostat F265 and allow coolant to drain.

NOTE:

Ignore - 2 -.

Fig. 438: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Front Coolant Pipe

• Remove drain plug - arrow - at front coolant pipe and drain coolant.

Audi A8 L Quattro 2007 - Filling

• Tightening torques --> Coolant pump and coolant thermostat, assembly overview , --> Coolant pipes, assembly overview.
• Ignition switched off.

NOTE:

The cooling system is filled all year round with a mixture of frost and corrosion protection additives and water. Use only coolant additive Plus G 012 A8F A1 (short: G12+) "according to TL VW 774 F". Other coolant additives may above all reduce the corrosion protection effect significantly. The damage resulting from this may lead to loss of coolant and consequently to severe engine damage. Coolant additive G12+ can be combined with additives G11 and G12. G12+ and coolant additives with the designation "according to TL VW 774 F" reduce frost and corrosion damage as well as lime deposits. They also raise the boiling point. For this reason the system must be filled all year round with frost and corrosion protection additives. Because of its high boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates. Protection against frost must be assured to about -25? C (in arctic climatic countries to about -35? C). The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive portion must be at least 40%. If for climatic reasons greater frost protection is required, the amount of G12+ can be increased, but only up to 60% (frost protection to about -40? C), otherwise frost protection and cooling effectiveness will be reduced. Only clean drinking water may be used for mixing coolant. If the radiator, heater core, cylinder head and cylinder head gasket or cylinder block is replaced, completely replace the engine coolant. Do not reuse contaminated coolant. For coolant G12+ , use refractometer T10007 to test frost protection in cooling system.

Fig. 439: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Coolant Thermostat Housing

• Install drain plug - 1 - with new O-ring on Map Controlled Engine Cooling Thermostat F265.

NOTE:

Ignore - 2 -.

Fig. 440: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Front Coolant Pipe

• Reinstall drain plug - arrow - with new gasket at front coolant pipe.

Fig. 441: Audi A8 L Quattro 2007 - Component Locations - Filling Coolant Reservoir Of Cooling System Charge Unit VAS 6096 With Pre-Mixed Coolant

• Fill coolant reservoir of Cooling System Charge Unit VAS 6096 with at least 15 liters of pre-mixed coolant with correct mixture ratio:

• G12+ (40%) and water (60%) for frost protection up to -25? C
• G12+ (50%) and water (50%) for frost protection up to -35? C
• G12+ (60%) and water (40%) for frost protection up to -40? C

• Attach adapter V.A.G 1274/8 to coolant expansion tank.
• Install Cooling System Charge Unit VAS 6096 on adapter V.A.G 1274/8.
• Place air outlet hose - 1 - into a small container - 2 -. (A small amount of coolant is drawn off which should be reserved with the discharged air.)
• Close both valves - A and B - by turning lever perpendicular to direction of flow.

• Connect hose - 3 - to pressurized air.

• Pressure: 6 to 10 bar positive pressure.

Fig. 442: Audi A8 L Quattro 2007 - Component Locations - Identifying VAS 6096/1 & VAS 6096 Valves

• Open valve - B - , to do this turn lever in direction of flow.

A vacuum is created in cooling system by suction jet pump.

• Needle on instrument display must travel into green region.

• Also briefly open valve - A - by turning lever in direction of flow so that Cooling System Charge Unit VAS 6096 coolant reservoir hose is filled with coolant.
• Close valve - A - again.
• Let valve - B - remain open another 2 minutes.

• A further vacuum is created in cooling system by suction jet pump.
• Needle on instrument display must still remain in green region.

• Close valve - B -.

• Needle in display instrument must remain in green region, then sufficient vacuum in cooling system is obtained for upcoming filling.

If needle stands below green region, repeat procedure.

If vacuum decreases, cooling system is leaking.

• Disconnect pressurized air hose.
• Open valve - A -.

The vacuum in the cooling system has the effect of extracting coolant from coolant reservoir of VAS 6096 ; cooling system is filled.

• Detach Cooling System Charge Unit VAS 6096 from adapter V.A.G 1274/8 on coolant expansion tank.

Fig. 443: Audi A8 L Quattro 2007 - Component Locations - Connecting Adapter For VAG1274 Tester V.A.G 1274/10 To Adapter V.A.G 1274/8.

• Connect pipe for cooling system tester V.A.G 1274/10 to adapter.

Fig. 444: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - for plenum chamber covers.
• Remove plenum chamber cover - 2 -.

NOTE:

Ignore - 3 -.

Fig. 445: Audi A8 L Quattro 2007 - Component Locations - Bleeder Screws

• Open bleeder screws - arrows -.
• Fill up coolant until it escapes from bleeder holes in coolant hoses.
• Close bleeder screws.
• If present, switch on auxiliary heater for about 30 seconds.

• Twist cap for expansion tank closed.
• Start engine.
• Set left and right heating/air conditioning system to "HI".
• Let engine run at 2000 RPM for 3 minutes.

• Let engine run at idle long enough until both large coolant hoses on main cooler are warm.
• Let engine run at 2000 RPM for 1 minute.
• Turn off engine and allow it to cool off.
• Check coolant level.

Fig. 446: Audi A8 L Quattro 2007 - Component Locations - Coolant Level

• Coolant level must be at "MAX" marking with engine cold.
• Coolant level may be above "MAX" marking with engine at operating temperature.

Audi A8 L Quattro 2007 - Coolant pump, coolant thermostat, coolant pipes Coolant pump and coolant thermostat, assembly overview

Fig. 447: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Coolant Pump And Coolant Thermostat, Assembly Overview

1 - Seal

• Replace

2 - Coolant pump housing

• Removing and installing --> Coolant pump, removing and installing

3 - Bolt

• Tightening torque --> Coolant pipes, assembly overview

4 - Front coolant line

• Removing and installing --> Front coolant line, removing and installing

5 - O-ring

• Replace

6 - Seal

• Replace

7 - Coolant pump

• Removing and installing --> Coolant pump, removing and installing

8 - O-ring

• Replace

9 - Bolt

• 9 Nm

10 - Drive shaft for coolant pump

11 - O-ring

• Replace

12 - Map Controlled Engine Cooling Thermostat F265

• Removing and installing --> Map Controlled Engine Cooling Thermostat F265 , removing and installing
• Coolant thermostat opening data --> Coolant thermostat opening data

13 - O-ring

• Replace

14 - Drain plug

• 4 Nm

15 - Bolt

• 9 Nm

Audi A8 L Quattro 2007 - Coolant pump, removing and installing

Special tools, testers and auxiliary items required

Fig. 448: Audi A8 L Quattro 2007 - Component Locations - Hose Clamp Pliers V.A.G 1921

• Hose clamp pliers V.A.G 1921

Removing

• Remove front coolant pipe --> Front coolant line, removing and installing.

Fig. 449: Audi A8 L Quattro 2007 - Component Locations - Identifying Drain Plug At Coolant Thermostat Housing

• Separate electrical connection - 2 - at Map Controlled Engine Cooling Thermostat F265.

NOTE:

Ignore - 1 -.

Fig. 450: Audi A8 L Quattro 2007 - Component Locations - Identifying Coolant Hose, Bolts & Coolant Thermostat Housing

• Remove coolant hoses - 1 and 2 - from Map Controlled Engine Cooling Thermostat F265.

NOTE:

Ignore - arrows -.

Fig. 451: Audi A8 L Quattro 2007 - Component Locations - Loosening Hose Clip At Coolant Hose

• Loosen hose clip - 1 - at coolant hose.
• Remove bolts - arrows -.
• Remove coolant pump housing toward front, while doing this, pay attention to drive shaft for coolant pump.

NOTE:

Coolant hose can only be removed with coolant pump removed.

Fig. 452: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts, Coolant Pump, And Housing

• Remove bolts - arrows - and remove coolant pump - 2 - from housing - 1 -.

Installing

• Tightening torques --> Coolant pump and coolant thermostat, assembly overview.

NOTE:

Replace seals and O-rings. Secure all hose connections using hose clamps appropriate for the model type .

Fig. 453: Audi A8 L Quattro 2007 - Component Locations - Inserting New O-Rings & Coolant Pump Input Shaft In Oil Pump Mount

• Insert new O-rings - 1 and 3 -.
• Insert coolant pump input shaft - 2 - in oil pump mount as far as stop.
• Slide coolant pump into mounts in upper part of oil pan.

NOTE:

To connect drive flange onto hex head of drive shaft, reach with the finger into the lower pipe connection of coolant pump and twist at impeller until coolant pump can be inserted completely.

The rest of installation is in reverse order of removal, note the following:

• Install front coolant pipe --> Front coolant line, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Map Controlled Engine Cooling Thermostat F265 , removing and installing

Removing

• Drain coolant --> Cooling system, draining and filling.

Fig. 454: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connector On Map Controlled Engine Cooling Thermostat F265

• Disconnect electrical connector - arrow - on Map Controlled Engine Cooling Thermostat F265.

NOTE:

Ignore - 1 -.

Fig. 455: Audi A8 L Quattro 2007 - Component Locations - Identifying Coolant Hose, Bolts & Coolant Thermostat Housing

• Remove coolant hoses - 1 and 2 - from Map Controlled Engine Cooling Thermostat F265 and drain coolant.
• Remove bolts - arrows - and remove Map Controlled Engine Cooling Thermostat F265.

Installing

• Tightening torque --> Coolant pump and coolant thermostat, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace sealing rings and O-rings. Secure all hose connections using hose clamps appropriate for the model type .

• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Coolant thermostat opening data

Opening begins	Opening ends	Opening lift	Voltage at thermostat
approx. 105? C	approx. 117? C	min. 8 mm	0 V
	approx. 105? C	min. 8 mm	14 V

NOTE:

The coolant thermostat cannot be checked with workshop equipment.

Audi A8 L Quattro 2007 - Coolant pipes, assembly overview

Fig. 456: Audi A8 L Quattro 2007 - Component Locations - Coolant Pipes, Assembly Overview

1 - Front coolant line

• Removing and installing --> Front coolant line, removing and installing

2 - Bolt

• Replace
• 8 Nm additional 90? (¹ /₄ turn).

3 - O-ring

• Replace

4 - Bolt

• 9 Nm

5 - Right coolant line

• Removing and installing --> Right coolant pipe, removing and installing

6 - Coolant hose

7 - O-ring

• Replace

8 - Engine Coolant Temperature (ECT) Sensor G62

• Removing and installing --> Engine Coolant Temperature (ECT) Sensor G62 , removing and installing

9 - O-ring

• Replace

10 - Retaining clip

11 - Bolt

• 9 Nm

12 - Rear coolant pipe

• Removing and installing --> Rear coolant line, removing and installing

13 - Bolt

• 9 Nm

14 - Bolt

• 9 Nm

15 - O-ring

• Replace

16 - Coolant hose

17 - Bolt

• 9 Nm

18 - Bolt

• Tightening torque --> Engine, installing

19 - Left coolant line

• Removing and installing --> Left coolant pipe, removing and installing

20 - Lower left coolant pipe

• Removing and installing --> Lower left coolant pipe, removing and installing

21 - Bolt

• 9 Nm

22 - Bolt

• Tightening torque --> 87 - AIR CONDITIONING

23 - O-ring

• Replace

24 - Bolt

• Replace
• 8 Nm additional 90? (¹ /₄ turn).

25 - Seal

• Replace

26 - Drain plug

• 10 Nm

Audi A8 L Quattro 2007 - Left heat shield

Fig. 457: Audi A8 L Quattro 2007 - Component Locations - Left Heat Shield Nuts

Nuts - 1, 3, 4, 5 -

• 2.5 Nm

Nut - 2 -

• 4.5 Nm

Audi A8 L Quattro 2007 - Right heat shield

Fig. 458: Audi A8 L Quattro 2007 - Component Locations - Right Heat Shield Nuts

Nuts - 1 and 3 -

• 4.5 Nm

Nuts - 2 and 4 -

• 2.5 Nm

Audi A8 L Quattro 2007 - Left drive shaft heat shield

Fig. 459: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Heat Shield From Transmission Bolts

Bolts - arrows -

• 23 Nm

Audi A8 L Quattro 2007 - Right drive shaft heat shield

Fig. 460: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Heat Shield Bolts

Bolts - arrows -

• 23 Nm

Audi A8 L Quattro 2007 - Engine Coolant Temperature (ECT) Sensor G62 , removing and installing

Removing

• Engine cold.

• Briefly open coolant expansion tank cap to reduce residual pressure in cooling system.

Fig. 461: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Remove rear engine cover.

Fig. 462: Audi A8 L Quattro 2007 - Component Locations - Identifying Vacuum Line, Air Guide Hose, Crankcase Ventilation Hose & Hose Clamps

• Free up fuel line and line to EVAP canister on air guide pipe.
• Remove air guide hose by loosening hose clamps - 2 and 5 -.
• Lay aside air guide hose with connected lines - 3 and 4 -.

NOTE:

Ignore - 1 -.

Fig. 463: Audi A8 L Quattro 2007 - Component Locations - Engine Coolant Temperature (ECT) Sensor G62 electrical connector

• Disconnect electrical connector - arrow - at Engine Coolant Temperature (ECT) Sensor G62.

NOTE:

Lay a cloth below to catch escaping coolant.

• Remove retaining clip and remove Engine Coolant Temperature (ECT) Sensor G62.

NOTE:

To improve clarity, the removed engine is shown.

Installing

Installation is in reverse order of removal, note the following:

NOTE:

Replace O-ring. To prevent coolant loss, immediately insert new Engine Coolant Temperature (ECT) Sensor G62 in support. Secure all hose connections using hose clamps appropriate for the model type .

• Check coolant level --> Filling.

Audi A8 L Quattro 2007 - Front coolant line, removing and installing

Special tools, testers and auxiliary items required

Fig. 464: Audi A8 L Quattro 2007 - Component Locations - Drip Tray For Workshop Crane VAS 6208

• Drip tray for workshop crane VAS 6208

Removing

• Drain coolant --> Cooling system, draining and filling.

Fig. 465: Audi A8 L Quattro 2007 - Component Locations - ATF Cooler From Coolant Hoses

• Remove bolts - arrows -.
• Remove coolant pipes to ATF cooler from lock carrier.

NOTE:

Ignore items - 1 to 4 -.

Fig. 466: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts Of Front Coolant Pipe

• Place drip tray for workshop crane VAS 6208 under engine.
• Remove bolts - arrows -.
• Remove front coolant pipe from engine and from coolant pump.

Installing

• Tightening torques --> Coolant pipes, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace O-rings.

• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Rear coolant line, removing and installing

Special tools, testers and auxiliary items required

Fig. 467: Audi A8 L Quattro 2007 - Component Locations - Hose Clamp Pliers V.A.G 1921

• Hose clamp pliers V.A.G 1921

Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

Fig. 468: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.
• Drain coolant --> Cooling system, draining and filling.
• Remove right secondary air injection combi-valve --> Right combination valve for Secondary Air Injection, removing and installing.

Fig. 469: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 2 and 4 -.

NOTE:

Ignore items - 1 and 3 -.

Fig. 470: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Fig. 471: Audi A8 L Quattro 2007 - Component Locations - Identifying Coolant Hose, Intake Manifold, Electrical Connector, Nuts & Bolts

• Loosen hose clamp - arrow -.

NOTE:

Ignore items - 1 to 5 -. To improve clarity, the removed engine is shown from the rear.

Fig. 472: Audi A8 L Quattro 2007 - Component Locations - Loosening Hose Clip At Coolant Hose

• Loosen hose clip - 1 - at coolant hose.

NOTE:

Ignore - arrows -.

Fig. 473: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Electrical Connection At Throttle Valve Control Module J338 & Removing Bolts And Throttle Valve Control Module J338

• Disconnect electrical connection - 1 - at throttle valve control module J338.
• Remove bolts - arrows - and remove Throttle Valve Control Module J338.

Fig. 474: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 Electrical Harness Connector

• Disconnect electrical connector - 2 - on Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 and remove vacuum hose - 1 -.
• Remove Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 from bracket and lay aside with hose connected.

NOTE:

Disregard - arrow -.

Fig. 475: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove electrical connectors - 1 through 4 - from bracket.
• Remove nut - arrows - and remove right electrical connectors bracket from bulkhead.

Fig. 476: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) Air Guide Hose & Coolant Hose

• Remove coolant hose - 2 - by pulling clip out slightly.

NOTE:

Ignore - 1 -.

Fig. 477: Audi A8 L Quattro 2007 - Component Locations - Removing Air Guide Hose

• Remove air guide hose - 1 -.

NOTE:

Ignore items - 2 and 3 -. To improve clarity, the removed engine is shown from the rear.

Fig. 478: Audi A8 L Quattro 2007 - Component Locations - Removing Crankcase Ventilation Hose, Bolts & Oil Drain Hose

• Remove crankcase ventilation hose - 1 and 2 -.
• Remove bolts - 3 and 5 - and press crankcase ventilation pressure regulator valve from throttle valve connections.
• Remove oil drain hose - arrow -.

NOTE:

Ignore - 4 - and Hose Clamps Up to 25 mm dia. 3094. To improve clarity, the removed engine is shown from the rear.

Fig. 479: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Dipstick, Bolts, Electrical Connectors, And Ventilation Hose

• Remove oil dipstick - 10 - from guide tube.
• Remove bolts - 2 and 5 -.
• Disconnect electrical connectors - 1, 3, 4, 6, 8 - and free up wiring harness.
• Remove Hall sensor - 9 -.

• Place wiring harness on engine.

NOTE:

Ignore - 7 -.

Fig. 480: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Vacuum Lines To Brake Booster

• Disconnect vacuum lines - arrows - to brake booster.
• Lay vacuum lines aside.

NOTE:

Ignore - 1 -.

Fig. 481: Audi A8 L Quattro 2007 - Component Locations - Oil Dipstick Guide Tube, Pivot Hydraulic Oil Pipe & Coolant Pipe Bolts

• Remove bolt - 1 - and remove oil dipstick guide tube upward.
• Remove bolts - 2 and 3 - and remove left coolant pipe from coolant hoses - arrows -.
• Place coolant pipe back slightly.

NOTE:

Ignore items - 4 and 5 -.

Fig. 482: Audi A8 L Quattro 2007 - Component Locations - Identifying Coolant Hose, Intake Manifold, Electrical Connector, Nuts & Bolts

• Remove coolant hose - 2 - to intake manifold.
• Disconnect electrical connector - 3 - on Engine Coolant Temperature (ECT) Sensor G62.
• Remove nuts - 5 -.
• Remove bracket with electrical connectors and wiring harness from rear coolant pipe.

• Remove bolts - 1 and 4 -.
• Remove rear coolant pipe from right coolant pipe - arrow -.
• Remove rear coolant pipe to right side of vehicle.

NOTE:

To improve clarity, the removed engine is shown from the rear.

Installing

• Tightening torques --> Coolant pipes, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace O-rings. Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location.

• Clean or smooth O-ring sealing surfaces.
• Install right secondary air injection combi-valve --> Right combination valve for Secondary Air Injection, removing and installing.
• Install left coolant pipe --> Left coolant pipe, removing and installing.
• Install Hall sensor --> Valvetrain, assembly overview.

• Install Throttle Valve Control Module J338 --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install crankcase ventilation pressure regulator valve --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Left coolant pipe, removing and installing

Special tools, testers and auxiliary items required

Fig. 483: Audi A8 L Quattro 2007 - Component Locations - Hose Clamp Pliers V.A.G 1921

• Hose clamp pliers V.A.G 1921

Fig. 484: Audi A8 L Quattro 2007 - Component Locations - Spring-Type Clip Pliers VAS 5024 A

• Spring-type clip pliers VAS 5024 A

Removing

• Drain coolant --> Cooling system, draining and filling.

Fig. 485: Audi A8 L Quattro 2007 - Component Locations - Loosening Hose Clip At Coolant Hose

• Loosen hose clip - 1 - at coolant hose.

NOTE:

Ignore - arrows -.

Fig. 486: Audi A8 L Quattro 2007 - Component Locations - Left Heat Shield Nuts

• Remove nuts - 1 and 5 - accessible from below.

NOTE:

Nuts - 2, 3, 4 - are removed at a later time.

Fig. 487: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Vacuum Lines To Brake Booster

• Disconnect vacuum lines - arrows - to brake booster.
• Lay vacuum lines aside.

NOTE:

Ignore - 1 -.

• Remove left cylinder head cover --> Left cylinder head cover, removing and installing.

NOTE:

Cover cylinder head with a clean cloth so that nothing falls inside.

Fig. 488: Audi A8 L Quattro 2007 - Component Locations - Power Steering Hydraulic Pressure Line & Coolant Hose

• Remove front coolant hose - 2 - from left lower coolant line.

NOTE:

Ignore - 1 -.

Fig. 489: Audi A8 L Quattro 2007 - Component Locations - Left Heat Shield Nuts

• Remove nuts - 2 through 4 - accessible from above.
• Remove heat shield - A - from threaded pins.
• Remove heat shield - B - upward.

Fig. 490: Audi A8 L Quattro 2007 - Component Locations - Identifying Electrical Harness Connector At Camshaft Position (CMP) Sensor 4 G301

• Remove Camshaft Position (CMP) Sensor 4 G301 - arrow - (left cylinder bank).

Fig. 491: Audi A8 L Quattro 2007 - Component Locations - Oil Dipstick Guide Tube, Pivot Hydraulic Oil Pipe & Coolant Pipe Bolts

• Remove bolt - 1 - and remove oil dipstick guide tube upward.
• Remove bolts - 4 and 5 - and pivot hydraulic oil pipe to side.
• Remove bolts - 2 and 3 - and remove left coolant pipe from coolant hoses - arrows -.

Installing

• Tightening torques --> Coolant pipes, assembly overview , Left heat shield

Installation is in reverse order of removal, note the following:

NOTE:

Replace oil dipstick guide tube O-ring. Secure all hose connections using hose clamps appropriate for the model type .

• Place oil dipstick guide tube in hole on upper part of oil pan.
• Install Camshaft Position (CMP) Sensor 4 G301 (left cylinder bank) --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left cylinder head cover --> Left cylinder head cover, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Lower left coolant pipe, removing and installing

Special tools, testers and auxiliary items required

Fig. 492: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Lower Left Coolant Pipe, Removing And Installing

• Engine support bridge 10 - 222 A

Fig. 493: Audi A8 L Quattro 2007 - Component Locations - Adapter 10 - 222 A/21

• Adapter 10 - 222 A/21

Fig. 494: Audi A8 L Quattro 2007 - Component Locations - Hose Clamp Pliers V.A.G 1921

• Hose clamp pliers V.A.G 1921

Fig. 495: Audi A8 L Quattro 2007 - Component Locations - Spring-Type Clip Pliers VAS 5024 A

• Spring-type clip pliers VAS 5024 A

Fig. 496: Audi A8 L Quattro 2007 - Component Locations - Engine Support Supplement Set T40093

• Engine Support Supplement Set T40093

Removing

• Drain coolant --> Cooling system, draining and filling.

Fig. 497: Audi A8 L Quattro 2007 - Component Locations - Loosening Hose Clip At Coolant Hose

• Loosen hose clip - 1 - at coolant hose.

NOTE:

Ignore - arrows -.

• Remove left front muffler --> Left front muffler, removing and installing.

Fig. 498: Audi A8 L Quattro 2007 - Component Locations - Left Heat Shield Nuts

• Remove nuts - 1 and 5 - accessible from below.

NOTE:

Nuts - 2, 3, 4 - are removed at a later time.

Fig. 499: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Vacuum Lines To Brake Booster

• Disconnect vacuum lines - arrows - to brake booster.
• Lay vacuum lines aside.

NOTE:

Ignore - 1 -.

Fig. 500: Audi A8 L Quattro 2007 - Component Locations - Identifying Oil Dipstick, Bolts, Electrical Connectors, And Ventilation Hose

• Remove oil dipstick - 10 - from guide tube.
• Remove bolts - 2 and 5 -.
• Disconnect electrical connectors - 1, 3, 4, 6, 8 - and free up wiring harness.
• Remove Hall sensor - 9 -.

• Remove crankcase ventilation hose - 7 - by pressing release buttons.
• Place wiring harness on engine.

Fig. 501: Audi A8 L Quattro 2007 - Component Locations - Power Steering Hydraulic Pressure Line & Coolant Hose

• Remove front coolant hose - 2 - from left lower coolant line.

NOTE:

Ignore - 1 -.

Fig. 502: Audi A8 L Quattro 2007 - Component Locations - Left Heat Shield Nuts

• Remove nuts - 2 through 4 - accessible from above.
• Remove heat shield - A - from threaded pins.
• Remove heat shield - B - upward.

Fig. 503: Audi A8 L Quattro 2007 - Component Locations - Disconnect Electrical Connector On ABS Control Module

• Disconnect electrical connector on ABS control module - arrow - --> 45 - ANTI-LOCK BRAKE SYSTEM .

Fig. 504: Audi A8 L Quattro 2007 - Component Locations - Oil Dipstick Guide Tube, Pivot Hydraulic Oil Pipe & Coolant Pipe Bolts

• Remove bolt - 1 - and remove oil dipstick guide tube upward.
• Remove bolts - 4 and 5 - and pivot hydraulic oil pipe to side.
• Remove bolts - 2 and 3 - and remove left coolant pipe from coolant hose - left arrow -.
• Pivot left coolant pipe upward slightly.

NOTE:

Ignore - right arrow -.

Fig. 505: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - and remove plenum chamber covers - 2 and 3 -.

Fig. 506: Audi A8 L Quattro 2007 - Component Locations - Securing Engine Support Bridge 10 - 222 A With Adapters 10 - 222 A/21 At Suspension Strut Domes

• Remove tower brace rear bolts - 3 -.
• Secure Engine Support Bridge 10 - 222 A/21 with Adapter 10 - 222 A/4 at suspension strut towers.

• Support for left and right side of vehicle is marked.
• The middle contact point - 2 - of the support is placed on tower brace front bolts.
• The Adapters 10 - 222 A/21 are secured with tower brace rear bolts - 3 -.
• The knurled thumb screw - 1 - must be turned downward far enough so that the contact plate rests on strut tower.

Fig. 507: Audi A8 L Quattro 2007 - Component Locations - Installing Adapter 10 - 222 A/4 With Adapters T40093/6 On Adapters 10 - 222 A/21 And Secure Spindles 10 - 222 A/11 At Engine Lifting Eyes

• Install Adapter 10 - 222 A/4 with adapters T40093/6 on adapters 10 - 222 A/21.
• Secure spindles 10 - 222 A/11 at engine lifting eyes.
• Lightly tension engine with engine support bridge spindles.
• Remove left front wheel.

Fig. 508: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Fig. 509: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Heat Shield From Transmission Bolts

• Remove drive shaft heat shield from transmission - arrows -.

NOTE:

To improve clarity, the engine is shown removed.

• Remove left drive axle from flange shaft.

Fig. 510: Audi A8 L Quattro 2007 - Component Locations - Left/Right Stabilizer Bar Mount Bolts

• Remove left and right stabilizer bar mount bolts - 1 and 2 -.

Fig. 511: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Remove bolts - 3 and 4 -.

NOTE:

Ignore items - 1 and 2 -.

Fig. 512: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts For Engine Mount At Left/Right

• Remove engine bracket bolts - arrows - at left and right.
• Remove engine carrier.

Fig. 513: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Level Control System Sensor Electrical Harness Connector & Left/Right Control Arms Coupling Rod

• Disconnect left and right electrical connector - 2 - on Level Control System Sensor.

NOTE:

Ignore - 1 -.

Fig. 514: Audi A8 L Quattro 2007 - Component Locations - Front Transmission Mount Left/Right Bolts

• Remove front transmission mount left and right bolts - arrows -.

Fig. 515: Audi A8 L Quattro 2007 - Component Locations - Lowering Subframe Dimension

• Lower subframe by dimension - a - by rotating spindles 10 - 222 A/11.

• Dimension - a - = 80 mm

Fig. 516: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose And Bolts

• Remove coolant hose - 3 - by pulling clip out slightly.
• Remove coolant hose - 4 - from left lower coolant line.
• Remove bolts - 1 and 2 -.
• Remove left lower coolant pipe.

Installing

• Tightening torques --> Coolant pipes, assembly overview , Left drive shaft heat shield.

Installation is in reverse order of removal, note the following:

NOTE:

Replace oil dipstick guide tube O-ring. Secure all hose connections using hose clamps appropriate for the model type .

• Install subframe and engine carrier --> 40 - FRONT SUSPENSION .
• Install left drive axle --> 40 - FRONT SUSPENSION .
• Install stabilizer bar --> 40 - FRONT SUSPENSION .
• Install left front muffler --> Left front muffler, removing and installing.

• Align exhaust system free of tension --> Exhaust system, installing free of tension.
• Install left coolant pipe --> Left coolant pipe, removing and installing.
• Install Hall sensor --> Valvetrain, assembly overview.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Right coolant pipe, removing and installing

Special tools, testers and auxiliary items required

Fig. 517: Audi A8 L Quattro 2007 - Component Locations - Hose Clamp Pliers V.A.G 1921

• Hose clamp pliers V.A.G 1921

Fig. 518: Audi A8 L Quattro 2007 - Component Locations - Spring-Type Clip Pliers VAS 5024 A

• Spring-type clip pliers VAS 5024 A

Removing

Fig. 519: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.
• Drain coolant --> Cooling system, draining and filling.
• Remove right cylinder head cover --> Right cylinder head cover, removing and installing.

Fig. 520: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 2 and 4 -.

NOTE:

Ignore items - 1 and 3 -.

Fig. 521: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Fig. 522: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Heat Shield Bolts

• Remove drive shaft heat shield - 1 - from transmission - arrows -.

NOTE:

Ignore - 2 -.

Fig. 523: Audi A8 L Quattro 2007 - Component Locations - Right Heat Shield Nuts

• Remove nuts - 1 and 4 - accessible from below.

NOTE:

Nuts - 2 and 3 - are removed at a later time.

Fig. 524: Audi A8 L Quattro 2007 - Component Locations - Vacuum Hose, Air Duct, Bolts & Intake Air Switch-Over Valve N335 Electrical Connector

• Disconnect vacuum hose - 1 - and remove air duct - 2 -.
• Remove bolts - arrows -.
• Rotate lower part of air filter housing and disconnect electrical connector - 3 - on Intake Air Switch-Over valve N335.
• Remove lower part of air filter housing.

Fig. 525: Audi A8 L Quattro 2007 - Component Locations - Lower Air Guide Hose

• Remove lower air guide hose from lower part of air filter housing - arrow -.

Fig. 526: Audi A8 L Quattro 2007 - Component Locations - Right Heat Shield Nuts

• Remove nuts - 2 and 3 - accessible from above.
• Remove heat shield - B - from threaded pins.
• Remove heat shield - A - upward.

Fig. 527: Audi A8 L Quattro 2007 - Component Locations - Coolant Hose & Clamp

• Remove coolant hose - arrow - from right coolant pipe.

Fig. 528: Audi A8 L Quattro 2007 - Component Locations - Coolant Pipe, Coolant Hoses & Bolts

• Remove bolts - 1 and 2 -.
• Remove right coolant pipe from coolant hoses - arrows -.

Installing

• Tightening torques --> Coolant pipes, assembly overview , Right heat shield, Right drive shaft heat shield.

Installation is in reverse order of removal, note the following:

NOTE:

Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location.

• Install right cylinder head cover --> Right cylinder head cover, removing and installing.
• Install air filter housing --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Radiator and coolant fan Radiator and coolant fan, assembly overview

Fig. 529: Audi A8 L Quattro 2007 - Component Locations - Radiator And Coolant Fan, Assembly Overview

1 - Coolant hose

• To pull off, disengage retaining clip

2 - O-ring

• Replace

3 - Bolt

• Replace
• 10 Nm

4 - Fan rib

• Removing and installing --> Fan shroud, removing and installing

5 - Rubber buffer

• Disengage and remove using screwdriver

6 - Retaining pin

7 - Coolant Fan V7

• With Coolant Fan Control (FC) Control Module J293
• Removing and installing --> Coolant fan, removing and installing

8 - Radiator

• Removing and installing --> Radiator, removing and installing
• After replacing, replace entire amount of coolant

9 - Bolt

• 6 Nm

10 - Bracket for radiator

11 - Coolant Fan 2 V177

• With Coolant Fan Control (FC) Control Module 2 J671
• Removing and installing --> Coolant fan, removing and installing

12 - O-ring

• Replace

13 - Coolant hose

• To pull off, disengage retaining clip

14 - Rubber bushing

15 - Bolt

• 10 Nm

16 - O-ring

• Replace

17 - Coolant hose

• To pull off, disengage retaining clip

Audi A8 L Quattro 2007 - Radiator, removing and installing

Removing

Fig. 530: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

Fig. 531: Audi A8 L Quattro 2007 - Component Locations - Coolant Hoses

• Remove coolant hoses - 1 and 2 - from radiator by pulling clips out slightly.

Fig. 532: Audi A8 L Quattro 2007 - Component Locations - Upper Coolant Hose From Radiator

• Remove upper coolant hose from radiator - arrow - by pulling clips out slightly.

Fig. 533: Audi A8 L Quattro 2007 - Component Locations - Identifying Outside Air Temperature Sensor G17 & Electrical Connectors

• Remove Outside Air Temperature Sensor G17 - 4 -.
• Disconnect electrical connectors - 1, 2, 3 -.
• Free up wiring harness.
• On a vehicle with distance regulation, disconnect electrical connector on Distance Regulation Control Module J428 - 5 -.

Fig. 534: Audi A8 L Quattro 2007 - Component Locations - Uncliping Electrical Harness Connectors From Braces

• Remove bolts - arrows - and remove bumper with braces.

NOTE:

Ignore items - 1 and 2 -.

CAUTION:

Risk of injury from refrigerant. The air conditioning refrigerant circuit must not be opened.

CAUTION:

Risk of damage to condenser and refrigerant lines and hoses. Do not stretch, kink or bend coolant lines and hoses.

Fig. 535: Audi A8 L Quattro 2007 - Component Locations - Removing Bolts And Bumper With Braces

• Remove bolts - arrows -.
• Pivot condenser with power steering cooler downward.
• Tie up condenser to engine.

Fig. 536: Audi A8 L Quattro 2007 - Component Locations - Removing Both Brackets For Radiator

• Remove both brackets for radiator - arrows -.
• Pivot upper radiator forward slightly and lift it out from lock carrier.

Installing

• Tightening torques --> Radiator and coolant fan, assembly overview.

Installation is in reverse order of removal, note the following:

• Install front bumper cover --> 63 - BUMPERS .
• Fill with coolant --> Filling.

NOTE:

Complete coolant must be replaced if the radiator was replaced.

Audi A8 L Quattro 2007 - Cooling system, checking for leaks

Fig. 537: Audi A8 L Quattro 2007 - Component Locations - Identifying Special Tools - Cooling System, Checking For Leaks

Special tools, testers and auxiliary items required

• Cooling system tester V.A.G 1274
• Adapter V.A.G 1274/8
• Adapter V.A.G 1274/9

Work procedure

• Engine at operating temperature.

CAUTION:

Risk of scalding due to hot steam and hot coolant. When the engine is warm the cooling system is under pressure. To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

Fig. 538: Audi A8 L Quattro 2007 - Component Locations - Positioning Cooling System Tester V.A.G 1274 With Adapter V.A.G 1274/8 On Expansion Tank

• Position Cooling System Tester V.A.G 1274 with adapter V.A.G 1274/8 on expansion tank.
• Generate a positive pressure of approx. 1.0 bar using hand pump of cooling system tester.

If pressure drops:

• Look for leaking places and fix them.

Audi A8 L Quattro 2007 - Pressure relief valve in cap, checking

Fig. 539: Audi A8 L Quattro 2007 - Component Locations - Pressure Relief Valve In Cap, Checking

• Attach cooling system tester V.A.G 1274 with adapter V.A.G 1274/9 on sealing cap.
• Generate a positive pressure using hand pump of cooling system tester.

• Pressure release valve must open at a positive pressure of 1.4 to 1.6 bar.

If check-valve does not open as indicated:

• Replace cap.

Audi A8 L Quattro 2007 - Fan shroud, removing and installing

Removing

• Drain coolant --> Cooling system, draining and filling.
• Remove radiator --> Radiator, removing and installing.

Fig. 540: Audi A8 L Quattro 2007 - Component Locations - Radiator Fan Electrical Harness Connector

• Disconnect electrical harness connector - arrow - to radiator fan.

Fig. 541: Audi A8 L Quattro 2007 - Component Locations - Air Guide

• Remove air guide at left and right - arrows -.

Fig. 542: Audi A8 L Quattro 2007 - Component Locations - Removing Retaining Bolts For Fan Shroud

• Remove both retaining bolts for fan shroud and remove by pulling upward - arrows -.
• Swing fan shroud toward front at upper edge.

Fig. 543: Audi A8 L Quattro 2007 - Component Locations - Coolant Fan Electrical Connection

• Separate electrical connection - arrow - for coolant fan by reaching behind fan shroud.
• Remove fan shroud.

Installing

• Tightening torques --> Radiator and coolant fan, assembly overview.

Installation is in reverse order of removal, note the following:

• Install radiator --> Radiator, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Coolant fan, removing and installing

Removing

• Drain coolant --> Cooling system, draining and filling.
• Remove radiator --> Radiator, removing and installing.
• Remove fan shroud --> Fan shroud, removing and installing.

Fig. 544: Audi A8 L Quattro 2007 - Component Locations - Removing Coolant Fan Bolts

• Remove bolts - arrows -.
• Unclip electrical harness connectors and expose electrical wires.
• Remove coolant fan.

Installing

• Tightening torques --> Radiator and coolant fan, assembly overview.

Installation is in reverse order of removal, note the following:

• Install fan shroud --> Fan shroud, removing and installing.
• Install radiator --> Radiator, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - 26 - Exhaust system, Emission controls Muffler Muffler, assembly overview

Fig. 545: Audi A8 L Quattro 2007 - Component Locations - Muffler, Assembly Overview

1 - Center muffler

• Original equipment as one unit with rear muffler. For repairs, replace each separately.
• Separating point --> Fig. 554
• Install exhaust system free of stress --> Exhaust system, installing free of tension

2 - Retaining loop

• Check pretension --> Exhaust system, installing free of tension

3 - Nut

• 23 Nm

4 - Bolt

5 - Nut

• Replace
• 25 Nm

6 - Gasket

• Replace

7 - Exhaust manifold with catalytic converter

• Protect from shocks and impact stress
• Removing and installing: Left --> Left exhaust manifold with catalytic converter, removing and installing , right --> Right exhaust manifold with catalytic converter, removing and installing

8 - Front exhaust pipe

• With flex joint

CAUTION:

Risk of damaging decoupling elements in front exhaust pipe. Do not bend decoupling elements in front exhaust pipe more than 10?.

• In original equipment as one unit with front muffler. For repairs, replace each separately.
• Removing and installing: Left --> Left front muffler, removing and installing , right --> Right front muffler, removing and installing
• Separating point --> Fig. 550
• Install exhaust system free of stress --> Exhaust system, installing free of tension

9 - Front muffler

• In original equipment as one unit with front exhaust pipe. For repairs, replace each separately.
• Removing and installing: Left --> Left front muffler, removing and installing , right --> Right front muffler, removing and installing
• Separating point --> Fig. 550
• Install exhaust system free of stress --> Exhaust system, installing free of tension

10 - Nut

• 23 Nm

11 - Clamping sleeve in the center

• Position clamping sleeve centrally to separation point
• Installed location --> Installation position of front and center clamping sleeves
• Before tightening, align exhaust system so that it is tension-free --> Exhaust system, installing free of tension
• Tighten threaded connections evenly.

12 - Front clamping sleeve

• For individual replacement of front exhaust pipe and front muffler
• Position clamping sleeve centrally to separation point
• Installed location --> Installation position of front and center clamping sleeves
• Before tightening, align exhaust system so that it is tension-free --> Exhaust system, installing free of tension

• Tighten threaded connections evenly.

13 - Nut

• 23 Nm

14 - Suspended mount

15 - Bolt

• 22 Nm

16 - Nut

• Replace
• 23 Nm

17 - End pipe

• Original equipment as one unit with rear muffler. For repairs, replace each separately.
• Separating point --> End pipe, replacing
• Aligning --> Tail pipes, aligning

18 - Bolt

• 23 Nm

19 - Retaining loop

• Check pretension --> Exhaust system, installing free of tension

20 - Rear muffler

• Original equipment as one unit with center muffler. For repairs, replace each separately.
• Separating point --> Fig. 554
• Install exhaust system free of stress --> Exhaust system, installing free of tension

21 - Clamping piece

22 - Nut

• 23 Nm

23 - Rear clamping sleeve

• For individual replacement of center and rear mufflers
• Position clamping sleeve centrally to separation point
• Installed location --> Installed position of rear double clamps
• Before tightening, align exhaust system so that it is tension-free --> Exhaust system, installing free of tension

• Tighten threaded connections evenly.

Audi A8 L Quattro 2007 - Installation position of front and center clamping sleeves

Fig. 546: Audi A8 L Quattro 2007 - Component Locations - Installing Double Clamps So That Bolt Ends Do Not Project Over Lower Edge Of Double Clamp

• When installing the double clamps, ensure that the bolt ends do not project beyond the lower edge of the clamping sleeves.

• Threaded connections point outward.

Audi A8 L Quattro 2007 - Installed position of rear double clamps

Fig. 547: Audi A8 L Quattro 2007 - Component Locations - Adjusting Rear Double Clamps So That Bolt Ends Do Not Project Over Lower Edges Of Double Clamps

• When installing the double clamps, ensure that the bolt ends do not project beyond the lower edge of the clamping sleeves.

• The threaded connections face each other.

Audi A8 L Quattro 2007 - Individual components of center bracket

Fig. 548: Audi A8 L Quattro 2007 - Component Locations - Individual Components Of Center Bracket

1. Threaded stud
2. Bracket
3. Tongue
4. Nut, self-locking, 25 Nm
5. Nut, self-locking, 25 Nm
6. Screws, 25 Nm

Audi A8 L Quattro 2007 - Front exhaust pipe and front muffler, separating

• A separating point is provided to replace front exhaust pipe or front muffler individually.
• The separating point is marked by a depression around circumference of front exhaust pipe.

Special tools, testers and auxiliary items required

Fig. 549: Audi A8 L Quattro 2007 - Component Locations - Chain Pipe Cutter VAS 6254

• Chain pipe cutter VAS 6254

Work procedure

Fig. 550: Audi A8 L Quattro 2007 - Component Locations - Exhaust Pipes Separating Point

• Separate exhaust pipes at separating point - arrows - using chain pipe cutter VAS 6254 at a right angle.

Fig. 551: Audi A8 L Quattro 2007 - Component Locations - Clamping Sleeve

• When installing clamping sleeve - arrows - , position at center on separating point.

Fig. 552: Audi A8 L Quattro 2007 - Component Locations - Installing Double Clamps So That Bolt Ends Do Not Project Over Lower Edge Of Double Clamp

• When installing double clamps, ensure that the bolt ends do not project beyond lower edge of clamping sleeves.

• Threaded connections point outward.

• Align exhaust system free of tension --> Exhaust system, installing free of tension.

Audi A8 L Quattro 2007 - Center muffler and rear muffler, separating

• A separating point has been provided in the connecting pipe for individual replacement of the center or rear muffler
• The separating point is marked by a depression around circumference of exhaust pipe.

Special tools, testers and auxiliary items required

Fig. 553: Audi A8 L Quattro 2007 - Component Locations - Chain Pipe Cutter VAS 6254

• Chain pipe cutter VAS 6254

Work procedure

Fig. 554: Audi A8 L Quattro 2007 - Component Locations - Exhaust Pipes Separating Point

• Separate exhaust pipes at separating point - arrows - using chain pipe cutter VAS 6254 at a right angle.

Fig. 555: Audi A8 L Quattro 2007 - Component Locations - Clamping Sleeve

• When installing clamping sleeve - arrows - , position at center on separating point.

Fig. 556: Audi A8 L Quattro 2007 - Component Locations - Adjusting Rear Double Clamps So That Bolt Ends Do Not Project Over Lower Edges Of Double Clamps

• When installing double clamps, ensure that the bolt ends do not project beyond lower edge of clamping sleeves.

• Threaded connections face inward.

• Align exhaust system free of tension --> Exhaust system, installing free of tension.

Audi A8 L Quattro 2007 - End pipe, replacing

Special tools, testers and auxiliary items required

Fig. 557: Audi A8 L Quattro 2007 - Component Locations - Chain Pipe Cutter VAS 6254

• Chain pipe cutter VAS 6254

Work procedure

• Tightening torque --> Muffler, assembly overview.

Fig. 558: Audi A8 L Quattro 2007 - Component Locations - Identifying End Pipes, Separating Point, Markings & Clamps

• Separate end pipe - 1 - at separating point - C - using Chain Pipe Cutter VAS 6254.
• Connect end pipe - 3 - up to marking - A - so that slot on end pipe lines up with marking - B -.
• Tighten clamping sleeve nut - 2 -.

Audi A8 L Quattro 2007 - Left front muffler, removing and installing

Removing

Fig. 559: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 2 and 4 -.

NOTE:

Ignore items - 1 and 3 -.

Fig. 560: Audi A8 L Quattro 2007 - Component Locations - Front Transverse Beam

• Unbolt front transverse beam - arrows -.

Fig. 561: Audi A8 L Quattro 2007 - Component Locations - Left Front Muffler Nuts

• Remove left front muffler nuts - 1 -.

NOTE:

Ignore items - 2 and 3 -.

CAUTION:

Risk of damaging decoupling elements in front exhaust pipe. Do not bend decoupling elements in front exhaust pipe more than 10?.

Fig. 562: Audi A8 L Quattro 2007 - Component Locations - Front Muffler Retaining Straps Nuts

• Remove nut - left arrow - at left front muffler retaining strap.

NOTE:

Ignore - right arrow -.

Fig. 563: Audi A8 L Quattro 2007 - Component Locations - Exhaust System Clamping Sleeves

• Disconnect exhaust system at left clamping sleeve - 1 - and remove left front muffler.

NOTE:

Ignore - 2 -.

Installing

• Tightening torque --> Muffler, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and self-locking nuts.

• Install front cross member --> 40 - FRONT SUSPENSION .
• Align exhaust system free of tension --> Exhaust system, installing free of tension.

Audi A8 L Quattro 2007 - Right front muffler, removing and installing

Removing

Fig. 564: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove rear sound insulation by loosening fasteners - 2 and 4 -.

NOTE:

Ignore items - 1 and 3 -.

Fig. 565: Audi A8 L Quattro 2007 - Component Locations - Front Transverse Beam

• Remove front transverse beam - arrows -.

Fig. 566: Audi A8 L Quattro 2007 - Component Locations - Right Front Muffler Nuts

• Remove right front muffler nuts - 1 -.

NOTE:

Ignore - 2 -.

CAUTION:

Risk of damaging decoupling elements in front exhaust pipe. Do not bend decoupling elements in front exhaust pipe more than 10?.

Fig. 567: Audi A8 L Quattro 2007 - Component Locations - Front Muffler Retaining Straps Nuts

• Remove bolt - right arrow - at right front muffler retaining strap.

NOTE:

Ignore - left arrow -.

Fig. 568: Audi A8 L Quattro 2007 - Component Locations - Exhaust System Clamping Sleeves

• Disconnect exhaust system at right clamping sleeve - 2 - and remove right front muffler.

NOTE:

Ignore - 1 -.

Installing

• Tightening torque --> Muffler, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and self-locking nuts.

• Install front cross member --> 40 - FRONT SUSPENSION .
• Align exhaust system free of tension --> Exhaust system, installing free of tension.

Audi A8 L Quattro 2007 - Exhaust system, installing free of tension

Work procedure

• Align exhaust system when cold.
• Tightening torques --> Muffler, assembly overview.

• Align front part of exhaust system to front muffler and clamping sleeves.
• Loosen clamping sleeves bolts.

Fig. 569: Audi A8 L Quattro 2007 - Component Locations - Pressing Rear Muffler Toward Front

• Press exhaust system forward - arrow - far enough so pre-tension on retaining loops reaches dimension - a -.

• Dimension - a - = 11 mm.

• Tighten clamping sleeve threaded connections evenly.
• Align end pipes --> Tail pipes, aligning.

Audi A8 L Quattro 2007 - Tail pipes, aligning

Work procedure

• Tightening torque --> Muffler, assembly overview.

Fig. 570: Audi A8 L Quattro 2007 - Component Locations - Checking Distance Of End Pipes At Left/Right To Bumper

• Check distance of end pipes at left and right to bumper:

• Dimension - x - left = dimension - x - right

Fig. 571: Audi A8 L Quattro 2007 - Component Locations - Loosening Threaded Connections Of Brace Between Exhaust Pipes

If necessary, correct dimension - x - as follows:

• Loosen threaded connections - arrow - of brace between exhaust pipes.
• Adjust distance between rear mufflers.
• Tighten bolts.

Fig. 572: Audi A8 L Quattro 2007 - Component Locations - Checking Distances Of End Pipes To Bumper

• Check distances - y - and - z - of end pipes to bumper:

• Dimension - y - = 13 to 17 mm.
• Dimension - z - = 8 to 12 mm.

• If end pipes cannot be aligned, check whether exhaust system is aligned tension-free --> Exhaust system, installing free of tension.

Audi A8 L Quattro 2007 - Exhaust manifold Exhaust manifold, assembly overview

Fig. 573: Audi A8 L Quattro 2007 - Component Locations - Exhaust Manifold, Assembly Overview

1 - Nut

• Replace
• Lubricate with hot bolt paste; Hot bolt paste
• Tightening sequence: Left exhaust manifold --> Left exhaust manifold tightening sequence , right exhaust manifold --> Right exhaust manifold tightening sequence

2 - Exhaust manifold with catalytic converter

• Individual components of mounting: Left --> Individual suspension components, left side , right --> Individual components of suspension, right side
• Removing and installing: Left --> Left exhaust manifold with catalytic converter, removing and installing , right --> Right exhaust manifold with catalytic converter, removing and installing

3 - Gasket

• Replace

4 - Securing strip

• Remains installed when removing exhaust manifold

5 - Nut

• Replace
• Lubricate with hot bolt paste; Hot bolt paste
• 25 Nm

6 - Securing strip

• Remains installed when removing exhaust manifold

7 - Nut

• Replace
• Lubricate with hot bolt paste; Hot bolt paste
• 25 Nm

Audi A8 L Quattro 2007 - Left exhaust manifold tightening sequence

Fig. 574: Audi A8 L Quattro 2007 - Component Locations - Left Exhaust Manifold Tightening Sequence

• Tighten nuts in 3 stages in - 1 to 6 - sequence as follows:

Tighten nuts by hand. Pre-tighten nuts to 20 Nm. Tighten nuts to 30 Nm.

Audi A8 L Quattro 2007 - Right exhaust manifold tightening sequence

Fig. 575: Audi A8 L Quattro 2007 - Component Locations - Right Exhaust Manifold With Catalytic Converter Nuts

• Tighten nuts in 3 stages in - 1 to 6 - sequence as follows:

Tighten nuts by hand. Pre-tighten nuts to 20 Nm. Tighten nuts to 30 Nm.

Audi A8 L Quattro 2007 - Individual suspension components, left side

Fig. 576: Audi A8 L Quattro 2007 - Component Locations - Individual Suspension Components, Left Side

1. Bolt, 23 Nm
2. Bolt, 23 Nm
3. Washer
4. Spring
5. Spacing sleeve
6. Spacing sleeve
7. Buffer
8. Tongue
9. Spacing sleeve

Audi A8 L Quattro 2007 - Individual components of suspension, right side

Fig. 577: Audi A8 L Quattro 2007 - Component Locations - Individual Components Of Suspension, Right Side

1. Bolt, 23 Nm
2. Bracket
3. Bolt, 23 Nm
4. Spacing sleeve
5. Spring
6. Washer
7. Bolt, 23 Nm
8. Bolt, 23 Nm
9. Spacing sleeve
10. Tongue
11. Buffer
12. Spacing sleeve

Audi A8 L Quattro 2007 - Left exhaust manifold with catalytic converter, removing and installing

Special tools, testers and auxiliary items required

Fig. 578: Audi A8 L Quattro 2007 - Component Locations - Engine Support Bridge 10 - 222 A

• Engine support bridge 10 - 222 A

Fig. 579: Audi A8 L Quattro 2007 - Component Locations - Adapter 10 - 222 A/21

• Adapter 10 - 222 A/21

Fig. 580: Audi A8 L Quattro 2007 - Component Locations - Tension Strap T10038

• Tension strap T10038

Fig. 581: Audi A8 L Quattro 2007 - Component Locations - Engine Support Supplement Set T40093

• Engine Support Supplement Set T40093

Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

Fig. 582: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.
• Drain coolant --> Cooling system, draining and filling.
• Remove left coolant pipe --> Left coolant pipe, removing and installing.
• Remove left front muffler --> Left front muffler, removing and installing.

Fig. 583: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove electrical harness connectors from bracket and disconnect it:

3 - For Heated Oxygen Sensor (HO2S) 2 G108

4 - For Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131

• Free up electrical wires to oxygen sensors.

NOTE:

Ignore items - 1 and 2 -.

• Remove left front wheel.
• Remove front part of left front wheel housing liner --> 66 - EXTERIOR EQUIPMENT .

Fig. 584: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolt

• Remove bolt - arrow - at torque support mount.

Fig. 585: Audi A8 L Quattro 2007 - Component Locations - Exhaust Manifold Nuts

• Remove bolt - arrow - and pull hydraulic oil pressure pipe forward slightly.
• Remove nuts - 6 to 1 -.

NOTE:

To improve clarity, the engine is shown removed. Nut - 1 - is accessible from wheel housing.

Fig. 586: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - and remove plenum chamber covers - 2 and 3 -.

Fig. 587: Audi A8 L Quattro 2007 - Component Locations - Securing Engine Support Bridge 10 - 222 A With Adapters 10 - 222 A/21 At Suspension Strut Domes

• Remove tower brace rear bolts - 3 -.
• Secure Engine Support Bridge 10 - 222 A/21 with Adapter 10 - 222 A/4 at suspension strut towers.

• Support for left and right side of vehicle is marked.
• The middle contact point - 2 - of the support is placed on tower brace front bolts.
• The Adapters 10 - 222 A/21 are secured with tower brace rear bolts - 3 -.
• The knurled thumb screw - 1 - must be turned downward far enough so that the contact plate rests on strut tower.

Fig. 588: Audi A8 L Quattro 2007 - Component Locations - Installing Adapter 10 - 222 A/4 With Adapters T40093/6 On Adapters 10 - 222 A/21 And Secure Spindles 10 - 222 A/11 At Engine Lifting Eyes

• Install Adapter 10 - 222 A/4 with adapters T40093/6 on adapters 10 - 222 A/21.
• Secure spindles 10 - 222 A/11 at engine lifting eyes.
• Lightly tension engine with engine support bridge spindles.

Fig. 589: Audi A8 L Quattro 2007 - Component Locations - Left/Right Stabilizer Bar Mount Bolts

• Remove left and right stabilizer bar mount bolts - 1 and 2 -.

Fig. 590: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Remove bolts - 3 and 4 -.

NOTE:

Ignore items - 1 and 2 -.

Fig. 591: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Fig. 592: Audi A8 L Quattro 2007 - Component Locations - Drive Shaft Heat Shield From Transmission Bolts

• Remove drive shaft heat shield from transmission - arrows -.

NOTE:

To improve clarity, the engine is shown removed.

• Remove left drive axle from transmission flange shaft.

Fig. 593: Audi A8 L Quattro 2007 - Component Locations - Front Transmission Mount Left/Right Bolts

• Remove front transmission mount left and right bolts - arrows -.

Fig. 594: Audi A8 L Quattro 2007 - Component Locations - Transmission Support Bolts

• Remove bolts - arrows - and remove transmission support with transmission mount.

Fig. 595: Audi A8 L Quattro 2007 - Component Locations - Ball Socket & Selector Lever Cable Bolts

• Identify installation position of selector lever cable bracket with a felt-tip pen for re-installation.
• Press ball socket - 1 - of selector lever cable from selector shaft lever using pry lever 80 - 200.
• Remove bolts - 2 - and lay aside selector lever cable.

NOTE:

Ignore - 3 -.

Fig. 596: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Level Control System Sensor Electrical Harness Connector & Left/Right Control Arms Coupling Rod

• Disconnect left and right electrical connector - 2 - on Level Control System Sensor.

NOTE:

Ignore - 1 -.

Fig. 597: Audi A8 L Quattro 2007 - Component Locations - Lowering Subframe Dimension

• Lower engine/transmission assembly by dimension - a - by rotating spindles 10 - 222 A/11.

• Dimension - a - = 80 mm maximum.

Fig. 598: Audi A8 L Quattro 2007 - Component Locations - Left Front Muffler Nuts

• Remove bolts - 2 and 3 - and remove tab.

NOTE:

Ignore - 1 -.

Fig. 599: Audi A8 L Quattro 2007 - Component Locations - Engine To Transmission Connection Bolt

• Pivot front of engine/transmission assembly slightly to right.
• Loosen one bolt - arrow - from engine to transmission connection approx. 2 turns and loosen Tension Strap T10038 around bolt and around brace on right longmember.

CAUTION:

Risk of damaging drive shaft boots. Carefully guide left exhaust manifold with catalytic converter when removing.

• Remove left exhaust manifold with catalytic converter toward rear.

Installing

• Tightening torques --> Engine, installing , --> Exhaust manifold, assembly overview , --> Left exhaust manifold tightening sequence , --> Individual suspension components, left side , --> Left drive shaft heat shield.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gasket and self-locking nuts.

Fig. 600: Audi A8 L Quattro 2007 - Component Locations - Left Exhaust Manifold Tightening Sequence

• Place new gasket onto stud bolts.
• Insert exhaust manifold in securing strips and tighten --> Left exhaust manifold tightening sequence
• Install left drive axle --> 40 - FRONT SUSPENSION .
• Install transmission mount --> 37 - CONTROLS, HOUSING .

• Install torque support bracket --> Assembly mount, overview.
• Install subframe --> 40 - FRONT SUSPENSION .
• Install stabilizer bar --> 40 - FRONT SUSPENSION .
• Install left coolant pipe --> Left coolant pipe, removing and installing.

• Install left front muffler --> Left front muffler, removing and installing.
• Align exhaust system free of tension --> Exhaust system, installing free of tension.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Right exhaust manifold with catalytic converter, removing and installing

Special tools, testers and auxiliary items required

Fig. 601: Audi A8 L Quattro 2007 - Component Locations - Engine Support Bridge 10 - 222 A

• Engine support bridge 10 - 222 A

Fig. 602: Audi A8 L Quattro 2007 - Component Locations - Adapter 10 - 222 A/21

• Adapter 10 - 222 A/21

Fig. 603: Audi A8 L Quattro 2007 - Component Locations - Drip Tray For Workshop Crane VAS 6208

• Drip tray for workshop crane VAS 6208

Fig. 604: Audi A8 L Quattro 2007 - Component Locations - Engine Support Supplement Set T40093

• Engine Support Supplement Set T40093

Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

CAUTION:

Risk of destroying electrical components when battery is disconnected. Observe measures when disconnecting battery.

• With ignition switched off, disconnect Battery Ground (GND) wire --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .

Fig. 605: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Remove rear engine cover.
• Drain coolant --> Cooling system, draining and filling.
• Remove right coolant pipe --> Right coolant pipe, removing and installing.
• Remove ribbed belt --> Ribbed belt, removing and installing

• Remove the generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Remove right front muffler --> Right front muffler, removing and installing.

Fig. 606: Audi A8 L Quattro 2007 - Component Locations - Right Electrical Connectors Bracket Bolts

• Remove electrical harness connectors from bracket and disconnect it:

1. For Heated Oxygen Sensor (HO2S) G39
2. For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130

• Free up electrical wires to oxygen sensors.

NOTE:

Ignore items - 3 and 4 -.

Fig. 607: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolt

• Remove bolt - arrow - at torque support mount.

Fig. 608: Audi A8 L Quattro 2007 - Component Locations - Torque Support Mount Bolts

• Remove bolts - arrows -.

Fig. 609: Audi A8 L Quattro 2007 - Component Locations - Identifying Rubber Seal & Plenum Chamber Covers

• Remove rubber seal - 1 - and remove plenum chamber covers - 2 and 3 -.

Fig. 610: Audi A8 L Quattro 2007 - Component Locations - Securing Engine Support Bridge 10 - 222 A With Adapters 10 - 222 A/21 At Suspension Strut Domes

• Remove tower brace rear bolts - 3 -.
• Secure Engine Support Bridge 10 - 222 A/21 with Adapter 10 - 222 A/4 at suspension strut towers.

• Support for left and right side of vehicle is marked.
• The middle contact point - 2 - of the support is placed on the tower brace front bolts.
• The Adapters 10 - 222 A/21 are secured with tower brace rear bolts - 3 -.
• The knurled thumb screw - 1 - must be turned downward far enough so that the contact plate rests on strut tower.

Fig. 611: Audi A8 L Quattro 2007 - Component Locations - Installing Adapter 10 - 222 A/4 With Adapters T40093/6 On Adapters 10 - 222 A/21 And Secure Spindles 10 - 222 A/11 At Engine Lifting Eyes

• Install Adapter 10 - 222 A/4 with adapters T40093/6 on adapters 10 - 222 A/21.
• Secure spindles 10 - 222 A/11 at engine lifting eyes.
• Lightly tension engine with engine support bridge spindles.

Fig. 612: Audi A8 L Quattro 2007 - Component Locations - Left/Right Stabilizer Bar Mount Bolts

• Remove left and right stabilizer bar mount bolts - 1 and 2 -.

Fig. 613: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Long Member Subframe

• Remove bolts - 3 and 4 -.

NOTE:

Ignore items - 1 and 2 -.

Fig. 614: Audi A8 L Quattro 2007 - Component Locations - Removing/Installing Bolts For Engine Mount At Left/Right

• Remove engine bracket bolts at left and right - arrows -.
• Remove engine carrier.

Fig. 615: Audi A8 L Quattro 2007 - Component Locations - Identifying Left Level Control System Sensor Electrical Harness Connector & Left/Right Control Arms Coupling Rod

• Disconnect left and right electrical connector - 2 - on Level Control System Sensor.

NOTE:

Ignore - 1 -.

Fig. 616: Audi A8 L Quattro 2007 - Component Locations - Lowering Subframe Dimension

• Lower engine/transmission assembly by dimension - a - by rotating spindles 10 - 222 A/11.

• Dimension - a - = 30 mm maximum.

• Remove torque support bracket.

Fig. 617: Audi A8 L Quattro 2007 - Component Locations - Torque Support & Bolts

• Remove bolts - 2 to 5 -.
• Remove torque support.

NOTE:

Ignore - 1 -.

Fig. 618: Audi A8 L Quattro 2007 - Component Locations - Right Engine Mount Electrical Harness Connector, Right Engine Support Electrical Wiring Bracket & Engine Support With Engine Mount Bolts

• Disconnect right engine mount electrical connectors - 2 -.
• Remove electrical wiring bracket from right engine support - 1 -.
• Remove bolts - arrows - and remove engine support with engine mount.

Fig. 619: Audi A8 L Quattro 2007 - Component Locations - Right Coolant Hose

• Place drip tray for workshop crane VAS 6208 under engine.
• Disconnect right coolant hose - arrow - and drain coolant.

Fig. 620: Audi A8 L Quattro 2007 - Component Locations - Right Exhaust Manifold With Catalytic Converter Nuts

• Remove nuts - 6 to 1 -.

NOTE:

Lower securing strips remain installed.

Fig. 621: Audi A8 L Quattro 2007 - Component Locations - Right Front Muffler Nuts

• Remove bolt - 2 - and remove right exhaust manifold from below with catalytic converter toward front.

NOTE:

Ignore - 1 -.

Installing

• Tightening torques --> Exhaust manifold, assembly overview , --> Left exhaust manifold tightening sequence , --> Individual components of suspension, right side.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gasket and self-locking nuts.

• Place new gasket onto stud bolts.

Fig. 622: Audi A8 L Quattro 2007 - Component Locations - Right Exhaust Manifold With Catalytic Converter Nuts

• Insert exhaust manifold in securing strips and tighten --> Left exhaust manifold tightening sequence.
• Install torque support and torque support bracket --> Assembly mount, overview.
• Install right front muffler --> Right front muffler, removing and installing.
• Install engine support with engine mount --> Assembly mount, overview.

• Install generator --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Install ribbed belt --> Ribbed belt, removing and installing.
• Install subframe and engine carrier --> 40 - FRONT SUSPENSION .
• Install stabilizer bar --> 40 - FRONT SUSPENSION .

• Install right coolant pipe --> Right coolant pipe, removing and installing.
• Align exhaust system free of tension --> Exhaust system, installing free of tension.
• Observe safety precautions after connecting battery --> 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Secondary air injection (AIR) system Principle and function

Principle

Due to the rich mixture during the cold start phase, the exhaust emissions contain an increased level of unburned hydrocarbons. The Secondary Air Injection (AIR) system improves the secondary oxidation within the catalytic converter, thereby reducing harmful emissions. The heat released by secondary oxidation shortens the start-up time of the catalytic converter considerably, as well as significantly improves emissions quality during the cold-running phase.

Function

In the cold start phase, the engine control module controls the Secondary Air Injection (AIR) pump via the pump relay. The stream of air from the Secondary Air Injection (AIR) pump opens the combination valves and allows air to flow into the exhaust system before the catalytic converter.

Audi A8 L Quattro 2007 - Secondary air injection (AIR) system, assembly overview

Fig. 623: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) System, Assembly Overview

1 - Secondary Air Injection (AIR) Pump Motor V101

• Component location: At front right in engine compartment below longmember
• Removing and installing --> Secondary Air Injection (AIR) pump, removing and installing
• Check in "Guided Fault-Finding" operating mode

2 - Bonded rubber bushing

3 - Bracket

• For Secondary Air Injection (AIR) pump motor V101

4 - Nut

• 9 Nm

5 - Bracket

• For Secondary Air Injection (AIR) Pump Motor V101 and ATF cooler

6 - Bolt

• 9 Nm

7 - Air guide hoses

• From Secondary Air Injection (AIR) Pump Motor V101 to secondary air injection combi-valves

8 - Right secondary air injection (AIR) combi-valve

• Component location: Back of right cylinder head
• Checking --> Combination valve for secondary air injection (AIR), checking function and for leaks
• Removing and installing --> Right combination valve for Secondary Air Injection, removing and installing

9 - Air guide hose

• To Secondary Air Injection (AIR) combi-valves

10 - Left secondary air injection (AIR) combi-valve

• Component location: back of left cylinder head
• Checking --> Combination valve for secondary air injection (AIR), checking function and for leaks
• Removing and installing --> Left combination valve for Secondary Air Injection, removing and installing

11 - Gasket

• Replace

12 - Bolt

• 9 Nm

13 - Bolt

• 9 Nm

14 - Connecting pipe

• To cylinder head

15 - Bolt

• 9 Nm

16 - Gasket

• Replace

17 - Air guide hose

• From air filter housing

Audi A8 L Quattro 2007 - Secondary Air Injection (AIR) pump, removing and installing

Removing

Fig. 624: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove front sound insulation by loosening fasteners - 1 -.

NOTE:

Ignore items - 2, 3, 4 -.

Fig. 625: Audi A8 L Quattro 2007 - Component Locations - Air Guide Hoses, Electrical Connector & Secondary Air Injection (AIR) Pump Nuts

• Remove air guide hoses - 1 and 2 -.
• Separate electrical connector - 3 -.
• Remove 3 nuts - 4 - and remove secondary air injection (AIR) pump from bracket.

Installing

• Tightening torque --> Secondary air injection (AIR) system, assembly overview.

Installation is in reverse order of removal.

Audi A8 L Quattro 2007 - Combination valve for secondary air injection (AIR), checking function and for leaks

Work procedure

• Hose connections properly sealed.

Fig. 626: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.

Fig. 627: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Air Guide Hose From Secondary Air Injection (AIR) Combi-Valve

• Disconnect air guide hose - 3 - from Secondary Air Injection (AIR) combi-valve.

NOTE:

The left combination valve for Secondary Air Injection (AIR) is depicted in the illustration. Ignore items - 1 and 2 -.

Fig. 628: Audi A8 L Quattro 2007 - Component Locations - Secondary Air Injection (AIR) Combi-Valve Assisting Hose

• Connect an assisting hose - arrow - to Secondary Air Injection (AIR) combi-valve.
• Blow into assisting hose using light pressure (do not use pressurized air).

• Secondary Air Injection (AIR) combi-valve must be closed, it must not be possible to blow through.

• Blow into assisting hose using higher pressure (do not use pressurized air).

• The Secondary Air Injection (AIR) combi-valve must open, it must be possible to blow through.

If switching point is not recognized:

• Replace Secondary Air Injection (AIR) combi-valve: Left --> Left combination valve for Secondary Air Injection, removing and installing , right --> Right combination valve for Secondary Air Injection, removing and installing.

Audi A8 L Quattro 2007 - Left combination valve for Secondary Air Injection, removing and installing

Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

Fig. 629: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.
• Drain coolant --> Cooling system, draining and filling.
• Remove left coolant pipe --> Left coolant pipe, removing and installing.
• Remove Heated Oxygen Sensor (HO2S) 2 G108 (in front of catalytic converter) --> 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig. 630: Audi A8 L Quattro 2007 - Component Locations - Disconnecting Air Guide Hose From Secondary Air Injection (AIR) Combi-Valve

• Remove air guide hose - 3 - on secondary air injection (AIR) combi-valve by pressing release buttons.
• Remove bolts - 1 and 2 -.
• Free up electrical wiring on secondary air injection (AIR) combi-valve.
• Remove Secondary Air Injection (AIR) combi-valve.

NOTE:

The engine is shown from behind to provide a better illustration.

Installing

• Tightening torque --> Secondary air injection (AIR) system, assembly overview.

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and O-rings. Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location.

• Install Heated Oxygen Sensor (HO2S) 2 G108 (in front of catalytic converter) --> 24 - MULTIPORT FUEL INJECTION (MFI) .
• Install left coolant pipe --> Left coolant pipe, removing and installing.
• Fill with coolant --> Filling.

Audi A8 L Quattro 2007 - Right combination valve for Secondary Air Injection, removing and installing

Removing

NOTE:

During installation, all cable ties must be re-installed at the same location.

Fig. 631: Audi A8 L Quattro 2007 - Component Locations - Removing Rear Engine Cover

• Pull rear engine cover - arrows - off.

Fig. 632: Audi A8 L Quattro 2007 - Component Locations - Identifying Vacuum Line, Air Guide Hose, Crankcase Ventilation Hose & Hose Clamps

• Free up fuel line and line to EVAP canister on air guide pipe.
• Remove vacuum line - 4 - to air guide hose from suction jet pump.

CAUTION:

Risk of violating emissions legislation. Do not open hose connection - 2 - !

• Lay aside air guide hose with connected crankcase ventilation hose - 3 - by loosening hose clamps - 2 and 5 -.

Fig. 633: Audi A8 L Quattro 2007 - Component Locations - Front Sound Insulation Fasteners

• Remove sound insulation by loosening fasteners - 1, 2, 4 -.

NOTE:

Ignore - 3 -.

Fig. 634: Audi A8 L Quattro 2007 - Component Locations - Bracket For Noise Insulation

• Remove bracket for noise insulation - arrows -.

Fig. 635: Audi A8 L Quattro 2007 - Component Locations - Identifying Bolts, Air Guide Hoses & Secondary Air Injection (AIR) Combi-Valve

• Remove bolts - 1 - from below.
• Remove air guide hoses - 3 and 4 - from above and lay them aside.
• Remove bolt - 2 - and free up electrical wiring on secondary air injection (AIR) combi-valve.
• Remove Secondary Air Injection (AIR) combi-valve.

NOTE:

The engine is shown from behind to provide a better illustration.

Installing

• Tightening torque --> .

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and O-rings. Secure all hose connections using hose clamps appropriate for the model type . During installation, all cable ties must be re-installed at the same location.