11 31 090 Installing and removing/replacing chain tensioner piston (N47 D20 O1)

Release chain tensioner (1).

Tightening torque: 11 12 3AZ .

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 into the clutch housing.

Fig 1: Identifying Chain Tensioner Bolts

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Installation note:

Replace sealing ring.

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: Installing Chain Tensioner On Level Support

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Installation note:

Install new chain tensioner (1) with AF 24 mm.

Fig 3: Identifying Chain Tensioner

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Assemble engine.