11 31 094 Removing hydraulic chain tensioner for timing chains on left side (N63)
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Special tools required:
WARNING:
Chain tensioner is pre-tensioned.
Release lock pin only in installed state.
Danger of injury!
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.
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 .
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 in illustration).
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 is under high preload force.
Chain tensioner arrangement:
- Piston
- Expansion element
- Compression spring
- Housing
Installation note:
Replace all gaskets and sealing rings.
Assemble engine.