11 31 090 Installing and removing/replacing chain tensioner piston (N20, N26)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Release screws (1).

Tightening torque: 11 65 4AZ .

Fig 1: Chain Tensioner Screws

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Raise vacuum unit (1) slightly.

Release chain tensioner (2).

Tightening torque: 11 31 7AZ .

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will escape after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Fig 2: Vacuum Unit And Chain Tensioner

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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 3: Compressing Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.