Timing Chain Tensioner: Service and Repair

11 31 090 Installing and removing/replacing chain tensioner piston (N54, N54T)





Necessary preliminary tasks:
Remove coolant expansion tank (E89 only)





Release chain tensioner (1).

Tightening torque:11 31 5AZ.

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

Installation note:
No sealing ring is fitted during series production assembly.

A sealing ring must be fitted by service personnel when the chain tensioner is fitted.





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

Repeat procedure twice.





Assemble engine.