11 31 094 Removing Hydraulic Chain Tensioner For Timing Chains on Left Side

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 work:
- Remove timing case cover at top left







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







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).







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.







Release screws (1).
Tightening torque 11 31 5AZ.
Remove chain tensioner (2).







IMPORTANT:
Danger of injury.
Chain tensioner is under high preload force.

Chain tensioner arrangement:
- Piston
- Expansion element
- Compression spring
- Housing







Installation note:
Replace all gaskets and sealing rings.

Assemble engine.