Engine/Drivetrain - Clacking Noises On Load Change
34 Clacking noises at load change - S4, S5, (B8), with S-tronic34 11 06
2027295/1
September 9, 2011.
Affected Vehicles
Condition
Clacking or knocking noises directly after a load change:
^ Overrun to acceleration.
-OR-
^ Acceleration to overrun.
These noises differ depending on driving situation or temperature.
Technical Background
Knocking noises are heard in the drivetrain.
Production
Not applicable.
Service
Such noises cannot be avoided and are normal.
It may be possible to reduce the noise by releasing tension on the drive train mountings.
1. Support engine in place using 10-222 A.
2. Remove belly pan, front wheels, and front fender liners.
3. Remove and replace front motor mount through bolts right and left (Figure 1 and 2), but leave loose until step 5.
4. Loosen the transmission mount bolts and cradle bolts only enough to allow movement of the transmission and engine (Figure 3).
5. By repositioning the engine/transmission, tension on the driveline can be removed. Retighten all the bolts for the transmission and engine mounts according to the repair manual.
6. Reinstall fender liners, wheels, and remove engine support.
7. Test drive to verify repair.
Tip: A gearbox replacement does not fix the complaint.
Warranty
Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.