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 DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSCATALYTIC CONVERTERADJUSTMENTS
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Catalytic Converter: Adjustments
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Adjustments
ALIGNMENT OF TWC
A - 13-17 mm (approx. 1/2-11/16 inch).
B - 9 mm (approx. 3/8 inch).
C - Parallel to lower edge of vehicle
NOTES:
^ The TWC's are shown as viewed from the rear.
^ The distance from the pipes to the crossmember must be at least 34 mm {1-11/32 inch).
INSTALLED POSITION OF DOUBLE CLAMPS BETWEEN TWC AND MIDDLE SILENCERS
NOTES:
^ After loosening, the bolted double clamps MUST be replaced.
^ Double clamps are shown from the rear of the vehicle.
Install double clamps as shown. Bolt ends must not extend beyond lower edge of clamping sleeve.
Nut tightening torque: 40 Nm (30 ft. lbs.).
A - 13-17 mm (approx. 1/2-11/16 inch).
B - 9 mm (approx. 3/8 inch).
C - Parallel to lower edge of vehicle
NOTES:
^ The TWC's are shown as viewed from the rear.
^ The distance from the pipes to the crossmember must be at least 34 mm {1-11/32 inch).
INSTALLED POSITION OF DOUBLE CLAMPS BETWEEN TWC AND MIDDLE SILENCERS
NOTES:
^ After loosening, the bolted double clamps MUST be replaced.
^ Double clamps are shown from the rear of the vehicle.
Install double clamps as shown. Bolt ends must not extend beyond lower edge of clamping sleeve.
Nut tightening torque: 40 Nm (30 ft. lbs.).
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.