Timing Chain Tensioner: Service and Repair

11 31 090 Installing and removing/replacing chain tensioner piston (N55)





Necessary preliminary work:
^ Remove air duct





Release chain tensioner (1).

Tightening torque 11 31 7AZ.

Important!
Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Installation Note:
Replace sealing ring.

If the chain tensioner is reused, its oil chamber must be drained. Place chain tensioner on a level support and slowly compress.





Repeat process twice.





Assemble engine.