11 31 090 Installing and Removing/Replacing Chain Tensioner Piston (N54)

Release chain tensioner (1).

Tightening torque, see 11 31 5AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

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.

Installation:

No sealing ring is fitted during series-production assembly.

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

Fig 1: Identifying Chain Tensioner

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If the chain tensioner is reused, its oil chamber must be drained. Place chain tensioner on a level working surface and slowly compress.

Repeat procedure twice.

Fig 2: Placing Chain Tensioner

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Assemble engine.