11 31 090 Installing and removing/replacing chain tensioner piston (N52)
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2008 BMW Z4, 2007 BMW Z4, 2007 BMW 530xi, 2007 BMW 530i, and 2007 BMW 525xi. However, it is still accessible from the selected car via links, so may be relevant.
Release chain tensioner (1).
For tightening torque refer to 11 31 5AZ in 11 31 CAMSHAFT (N52) .
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:
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.