11 31 090 Installing and removing/replacing chain tensioner piston (N54, N54T)
WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 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.
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.