11 31 090 Installing and removing/replacing chain tensioner piston (N47 D20 O1)

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

Release chain tensioner (1).

Tightening torque: 11 12 3AZ .

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 into the clutch housing.

Fig 1: Identifying Chain Tensioner Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

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.

Fig 2: Installing Chain Tensioner On Level Support

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Install new chain tensioner (1) with AF 24 mm.

Fig 3: Identifying Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.