11 31 090 Installing and removing/replacing chain tensioner piston (N54, N54T)
WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
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.
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.