Timing Chain Tensioner: Service and Repair

11 31 090 Installing and removing or replacing chain tensioner piston (N18)

Special tools required:





Important!
Risk of chain jumping.
Position engine in 90° position with special tool 11 9 590.
Balance hole and dowel hole can be mixed up.
If necessary, determine by means of spark plug bore.

Rotate crankshaft at central bolt.

Position crankshaft with special tool 11 9 590.





Release chain tensioner (1).

Tightening torque:11 31 4AZ.

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





Remove all special tools.

Assemble engine.

N18: