11 31 090 Installing and removing or replacing chain tensioner piston (N18)

WARNING: This page is about a different car, the 2016 MINI Cooper Paceman, 2015 MINI Cooper Paceman, 2014 MINI Cooper Paceman, and 2013 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 9 590

Necessary preliminary tasks:

Remove WHEEL ARCH SHELL AT FRONT RIGHT .

IMPORTANT: Risk of chain jumping.
Position engine in 90° position with special tool 11 9 590 .
Balance hole and dowel hole can be mixed up.
If necessary, determine by means of spark plug bore.

Fig 1: Locking Flywheel With Special Tool (11 9 590)

Courtesy of BMW OF NORTH AMERICA, INC.

Rotate crankshaft at central bolt.

Position crankshaft with special tool 11 9 590 .

Release chain tensioner (1).

Tightening torque: 11 31 4AZ .

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 onto the belt drive.

Fig 2: Identifying Chain Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

A new sealing ring must be installed by service personnel when the chain tensioner is fitted.

Remove all special tools.

Assemble engine.