Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 Audi A8 QuattroFACTORY OEM SERVICE PROCEDURE
Specifications Index
SPECIFICATIONS INDEX
| System | Specification/Procedure | ||
|---|---|---|---|
| Air Conditioning | |||
| Service | A/C REFRIGERANT SYSTEM (R-134A), CHECKING & TESTING A/C REFRIGERANT SYSTEM (R-134A), CAPACITIES |
||
| Torque | A/C COMPRESSOR FROM MOUNTING BRACKET, REMOVING AND INSTALLING | ||
| Axle Nut/Hub Nut | |||
| Front | TORQUE SPECIFICATIONS | ||
| Rear | TORQUE SPECIFICATIONS | ||
| Battery | ON-VEHICLE TESTING | ||
| Brakes | |||
| Bleeding Sequence | BLEEDING PROCEDURES | ||
| Disc Brakes | DISC BRAKE SPECIFICATIONS | ||
| Torque | TORQUE SPECIFICATIONS | ||
| Charging | |||
| Generator | NA | ||
| Torque | TORQUE SPECIFICATIONS | ||
| Drive Belts | |||
| Adjustment & Belt Routing | ADJUSTMENTS | ||
| Engine Cooling | |||
| General Service Specifications | |||
| 3.7L | COOLING SYSTEM, DRAINING AND FILLING | ||
| 4.2L | COOLING SYSTEM, DRAINING AND FILLING | ||
| Radiator Cap Pressure | 1.4-1.6 Bar | ||
| Thermostat R & I | |||
| 3.7L | REPLACING THERMOSTAT | ||
| 4.2L | THERMOSTAT, REMOVING AND INSTALLING | ||
| Water Pump R & I | |||
| 3.7L | REMOVING COOLANT PUMP | ||
| 4.2L | COOLANT PUMP, REMOVING AND INSTALLING | ||
| Engine Mechanical | |||
| 3.7L | |||
| Compression | COMPRESSION PRESSURE, CHECKING | ||
| Oil Pressure | At Idle: 1.0 to 2.5 Bar At 3000 RPM: 3.0 to 5.0 Bar |
||
| Overhaul | ENGINE - CYLINDER HEAD, VALVETRAIN | ||
| Torque | See Appropriate Procedure | ||
| 4.2L | |||
| Compression | COMPRESSION PRESSURE, CHECKING | ||
| Oil Pressure | At Idle: 1.0 to 2.5 Bar At 3000 RPM: 3.0 to 5.0 Bar |
||
| Overhaul | ENGINE - CRANKSHAFT, CYLINDER BLOCK | ||
| Torque | See Appropriate Procedure | ||
| Fluid Specifications | See FLUIDS under MAINTENANCE tab. | ||
| Flywheel/Flex Plate Torque | Flywheel: 60 Nm + 180° Drive Plate: 60 Nm + 90° |
||
| Fuel System | |||
| Pressure Specification | |||
| 3.7L | Approx: 3.6 Bar | ||
| 4.2L | Approx: 3.5 Bar | ||
| Fuel Pressure Test Procedure | |||
| 3.7L | FUEL PRESSURE REGULATOR AND RESIDUAL FUEL PRESSURE, CHECKING | ||
| 4.2L | NA | ||
| Ignition | |||
| Firing Order & Cylinder Identification | |||
| 3.7L | FIRING ORDER & CYLINDER INDENTIFICATION | ||
| 4.2L | FIRING ORDER & CYLINDER INDENTIFICATION | ||
| Ignition Wires (Resistance) | Coil-On-Plug | ||
| Ignition Wires (Routing) | Coil-On-Plug | ||
| Spark Plug | |||
| 3.7L | NA | ||
| 4.2L | TECHNICAL DATA, IGNITION SYSTEM | ||
| Starting | |||
| Starter/Torque | STARTER TORQUE SPECIFICATIONS |
||
| Wheel Alignment | |||
| Adjustment Specifications | WHEEL ALIGNMENT SPECIFICATIONS | ||
| Torque | TORQUE SPECIFICATIONS (FRONT) TORQUE SPECIFICATIONS (REAR) |
||
| Wheel & Tire | |||
| Wheel Lug Nut Torque | 120 Nm | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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