Timing Chain Tensioner: Service and Repair

Removing and Installing/Replacing Chain Tensioning Piston (S54)




E46 only:



Remove expansion rivet. Remove air duct (1).





Caution: Strong spring force.

Have a cleaning cloth ready. A small quantity of oil will emerge after the screw connection has been released.
Make sure no oil runs onto belt drive.
Remove any remnants of oil immediately with cleaning cloth.

Unfasten screw connection.
Remove chain tensioning piston.




Installation: If a chain tensioner is reused, its oil chamber must be drained.

Place chain tensioner on a level surface and compress slowly and carefully.
Repeat this procedure twice.





Installation: Install hydraulic chain tensioner (1) in cylinder for chain tensioning piston (2).

Replace sealing ring (3).
Install and tighten down cylinder for chain tensioning piston (2).

Tightening torque, 11 31 8AZ