11 31 090
Release chain tensioner (1).
Tightening torque 11 31 7AZ.
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.
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.