11 31 090 Removing and installing/replacing chain tensioner piston (B48AO0)

Necessary preliminary work: 

• Remove the CATALYTIC CONVERTER .

Removal: 

Release chain tensioner (1).

Attention! 

Have a cleaning cloth ready. A small quantity of engine oil will escape after the screw connection has been released.

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Installation: 

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.

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Parts:  Replace sealing ring (1).

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Release chain tensioner (1).

Tightening torque 11 12 5AZ .

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Required reworking: 

• Install the CATALYTIC CONVERTER .