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.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSCYLINDER HEAD TIGHTENING SEQUENCE & TORQUE
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Cylinder Head Tightening Sequence & Torque
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Cylinder Head Tightening Sequence & Torque
Cylinder Head Tightening Sequence:
Tightening Specifications
With Engine cold, tighten cylinder head bolts in steps, as follows:
Step 1, tighten in sequence to: 40 Nm (30 ft. lbs.).
Step 2, Tighten in sequence to: 60 Nm (44 ft. lbs.).
Step 3, turn an additional: 1/2-turn (180°).
NOTE: Carry out the additional 1/2-turn using a rigid wrench without lifting off the wrench
Two steps of 1/4-turn (90°) are also permissible.
It is not necessary to re-tighten the cylinder head bolts during regular service or after repairs.
CAUTION: To prevent cylinder head damage, loosen cylinder head bolts in stages using the reverse of the sequence shown in the illustration
RENDER: 1.0x
NO RELATED
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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.