11 31 090 Installing and removing/replacing chain tensioner piston (N14)

Special tools required:

11 9 590

Necessary preliminary tasks:

Remove WHEEL ARCH SHELL AT FRONT RIGHT .

Remove INTAKE SILENCER HOUSING .

IMPORTANT: Danger of chain jumping at camshaft sprockets.
To avoid:

Turn crankshaft at central bolt until crankshaft drive (flywheel) is positioned with special tool 11 9 590 and blocked.

Fig 1: Securing Crankshaft Using Special Tool (11 9 590)

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Release hose clamps (1) and detach charge air hose (2).

Installation note:

Install charge air hose (2) dry and free from grease.

Connecting branch on throttle valve must be dry and free from grease.

Position hose clamps (1) again correctly and ensure sufficient spacing to adjacent components.

The spacing between hose clamp and brake line must be 15 mm.

Fig 2: Identifying Charge Air Hose And Clamps

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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 3: Identifying Chain Tensioner

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Installation note:

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

Remove all special tools.

Assemble engine.