11 31 051 Replacing Timing Chain (N14)
Special tools required:
- 00 9 120
- 11 9 280
- 11 9 540
- 11 9 590
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Necessary preliminary tasks:
- Remove cylinder head cover.
- Remove all spark plugs.
- Remove vibration damper.
- Remove chain tensioner.
- Remove both VANOS adjustment units.
- Remove PTFE ring at front.
- Remove belt tensioner.
Position crankshaft with special tool 11 9 590 .
Do not remove special tool 11 9 590 during repair work.
Do not remove special tool 11 9 540 .
Fit special tool 11 9 280 on hub for vibration damper with screws (2).
Release central bolt in direction of arrow.
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Release bearing pins (1 and 2).
Tightening torque: See ENGINE - TIGHTENING TORQUES .
Remove hub (3) towards front.
Remove chain module with timing chain.
Using a hook (2), pull oil pump chain (1) upwards.
Sprocket wheel (1) of timing chain.
Sprocket wheel (2) of oil pump.
Secure chain module (1) with rubber (3) to facilitate assembly.
Pull timing chain (2) upwards until sprocket wheel (4) rests against chain guide (1).
Install timing chain (2) and sprocket wheel (4) in this position.
Installation:
Always keep timing chain (2) tensioned; it is possible for timing chain (2) to jam on chain module (1).
Installation position of both sprocket wheels.
Sprocket wheel (1) of oil pump.
Guide rail (2) of timing chain.
Hub (3) on crankshaft.
Sprocket wheel (4) of timing chain.
Attach oil pump sprocket wheel (2) in direction of arrow to crankshaft (1).
Insert chain module with timing chain and secure.
Attach crankshaft hub.
Screw in central bolt.
Remove special tool 11 9 280 from hub.
Secure central bolt with special tool 00 9 120 .
Install VANOS adjustment units.
Crank engine twice.
Check timing.
Install PTFE ring.
Assemble engine.