11 31 094 Removing hydraulic chain tensioner for timing chains on left side (N63)

Special tools required:

WARNING: Chain tensioner is pre-tensioned.

Release lock pin only in installed state.

Danger of injury!

IMPORTANT: Risk of damage!

The engine must not be cranked when the chain tensioner is removed.

The timing chain may jump.

Necessary preliminary tasks:

Crank engine back at central bolt (1) against direction of engine rotation by approx. 90°.

Fig 1: Cranking Engine Back Central Bolt

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IMPORTANT: The timing chain on the chain tensioner becomes the tight end on cranking back.

Do not crank engine without chain tensioner or special tool 11 9 900.

Piston (1) of chain tensioner must be pressed in against oil pressure in housing (see arrow).

Fig 2: Pressing Chain Tensioner

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If the chain tensioner piston is retracted over its full length, a 3.5 mm drill bit or a suitable lock pin must be positioned.

Fig 3: Positioning Chain Tensioner Lock Pin

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Release bolts (1).

Tightening torque 11 31 5AZ, see 11 31 CAMSHAFT

Remove chain tensioner (2).

Fig 4: Identifying Chain Tensioner Bolts

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IMPORTANT: Danger of injury!

Chain tensioner is under high preload force.

Chain tensioner arrangement:

Fig 5: Identifying Chain Tensioner Piston, Spring And Housing

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Installation:

Replace all gaskets and sealing rings .

Assemble engine.