11 31 090 Installing and Removing/Replacing Chain Tensioner Piston (N55)

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2017 BMW 550i GT xDrive, 2017 BMW 535i GT xDrive, 2017 BMW 535i GT, 2016 BMW 550i GT xDrive, and 2016 BMW 535i GT xDrive. 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.

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: Compressing Chain Tensioner for Draining Oil Chamber

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble Engine.