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Mercedes-Benz Tech Tip: Clunking Noises Heard During Acceleration And Throttle Lift Off

Owners of Mercedes-Benz cars with front-wheel drive and 4×4 vehicles, may complain of a single throttle lift-off clunking noise from the side shaft when first taking off (audible at the outboard end). Also, the clunk is heard once when changing from forward to reverse.

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Photo 1

Models: All Mercedes-Benz cars with front-wheel drive and 4×4 vehicles.

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Complaint: Single throttle lift-off clunking noise from the side shaft when first taking off (audible at the outboard end). Also, the clunk is heard once when changing from forward to reverse.

Cause: If the complaint is eliminated by experimentally loosening the outboard collar nut by one turn, the complaint is likely due to micro-movement in the connection between the wheel bearing inner race and the joint housing of the side shaft.

Note:
The collar nut must always be replaced after being loosened and must be tightened to the specified torque.

Photo 2

Remedy: Coat the contact surface of the shaft with wheel bearing using Molykote paint. To do this, proceed as follows:
1. Remove the outboard side shafts.
2. Clean the contact surface A (see Photo 1), making sure it is free of debris and oil.
3. Coat the contact surface A (see Photo 2) with Molykote and allow it to dry for one hour.
4. Reinstall the side shafts.

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