11 31 090 Removing and installing/replacing chain tensioner piston (N55 Hybrid)

WARNING: This page does not describe the selected car, but rather 50 other vehicles, including the 2016 BMW M5, 2016 BMW ActiveHybrid 5, 2016 BMW 550i xDrive, 2016 BMW 550i, and 2016 BMW 535i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

High-voltage hazard!

The following must be strictly observed prior to starting work :

Observe SAFETY INFORMATION for handling hybrid cars.

Necessary preliminary work:

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.

Installation note:

Replace sealing ring.

Fig 1: Identifying Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

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: Draining Oil Chamber Of Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.