11 31 090 Installing and removing/replacing chain tensioner piston (N55)

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove AIR DUCT .

Release chain tensioner (1).

Tightening torque: 11 31 7AZ .

IMPORTANT: 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.

Fig 1: Identifying Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Replace sealing ring.

If the chain tensioner is used again, the oil must be drained out of the chain tensioner. Place chain tensioner on a level support and slowly compress.

Repeat process twice.

Fig 2: Installing Chain Tensioner On Level Support

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.