Timing Chain: Service and Repair

11 31 051 - Replacing timing chain (N52K)





Special tools required:
- 00 9 140
- 11 0 300 11 0 300 Plug Mandrel
- 11 4 280 11 4 280 Gauge
- 11 4 281 11 4 280 Gauge
- 11 4 282 11 4 280 Gauge
- 11 4 283 11 4 280 Gauge
- 11 4 360
- 11 4 362
- 11 5 200 11 5 200 Spacer Ring
- 11 9 280 11 9 280 Holder





Necessary preliminary tasks:
- Remove cylinder head cover Service and Repair
- Remove all spark plugs Service and Repair
- Remove chain tensioner Service and Repair.
- Remove crankshaft radial seal Service and Repair at front
- Remove drive belt tensioner Service and Repair
- Remove vibration damper Service and Repair





Remove fastener (1) in direction of arrow.

Installation:
Install fastener (1) with bore facing outwards.





Rotate crankshaft at central bolt into TDC position.
Slide special tool 11 0 300 11 0 300 Plug Mandrel in direction of arrow into special tool bore and secure crankshaft.

Important!
On vehicles with optional extra SA205 (automatic transmission), there is a large bore for the TDC position shortly before the special tool bore. This bore can be confused with the special tool bore.

If the flywheel is secured in the correct special tool bore with special tool 11 0 300 11 0 300 Plug Mandrel, the engine can no longer be moved at the central bolt.





Important!
Do not remove special tool 11 0 300 11 0 300 Plug Mandrel to release central bolt (1).
Employ a second person for gripping when releasing central bolt (1).

Screw special tool 11 9 280 11 9 280 Holder onto hub of vibration damper.

Release central bolt (1).
Tightening torque 11 21 1AZ 11 21 Crankshaft and Bearings.
Remove hub towards front.





Open plug (1).
Tightening torque 11 31 7AZ 11 31 Camshaft.





Open plug (1).
Tightening torque 11 11 7AZ 11 11 Crankcase.

Installation:
Replace aluminium screws.





Release bearing pin (1) from timing chain module on cylinder head.
Tightening torque 11 31 5AZ 11 31 Camshaft.





Release bearing pin (1) from timing chain module on crankcase.
Tightening torque 11 31 4AZ 11 31 Camshaft.





Important!
Install special tool 11 4 280 11 4 280 Gauge to release the central bolts on the inlet and exhaust adjustment units.

Secure special tool 11 4 283 11 4 280 Gauge to cylinder head with bolts (1).

Note:
Fit special tool 11 4 282 11 4 280 Gauge underneath on side of inlet camshaft.

Mount special tool 11 4 281 11 4 280 Gauge on inlet and exhaust camshafts.

Do not remove special tool 11 4 280 11 4 280 Gauge.





Remove inlet and exhaust adjustment unit Removing and Installing/Replacing Inlet and Exhaust Adjustment Units.
Release bolts (1) from timing chain module on cylinder head.
Tightening torque 11 31 3AZ 11 31 Camshaft.
Remove chain module with timing chain and sprocket wheel upwards in direction of arrow.





Important!
Note installation direction of sprocket wheel (2).
Collar (see arrow) on sprocket wheel (2) points to engine.
Incorrect assembly will result in engine damage.





Pull timing chain (1) upwards until sprocket wheel (2) engages chain guide (3).
Install timing chain (1) and sprocket wheel (2) in this position.

Installation:
Always hold timing chain (1) under tension. Timing chain (1) may jam on chain guide (3).





Install hub with central bolt.
Tighten down special tool 11 5 200 11 5 200 Spacer Ring with screws (1) to hub.





Remove tensioner Service and Repair for drive belt.
Screw in special tool 11 4 362 from special tool kit 11 4 360.
Mount special tool 11 9 280 11 9 280 Holder on 11 5 200 11 5 200 Spacer Ring.
Support special tool 11 9 280 11 9 280 Holder on special tool 11 4 362.
Special tool 11 0 300 11 0 300 Plug Mandrel secures crankshaft.
Tighten central bolt to jointing torque.
Tightening torque 11 21 1AZ 11 21 Crankshaft and Bearings.
Mark central bolt and hub with paint.





Mark special tools with colored line (1).
See picture.

Important!
Do not remove the special tool while tightening the central bolt to torsion angle.
Risk of damage!

If necessary, tighten central bolt to torsion angle with special tool 00 9 140.

Tightening torque 11 21 1AZ 11 21 Crankshaft and Bearings.





Tighten central bolt with a second person helping.
Tightening torque 11 21 1AZ 11 21 Crankshaft and Bearings.
Install inlet and exhaust adjustment units Removing and Installing/Replacing Inlet and Exhaust Adjustment Units.
Install chain tensioner Service and Repair.





Crank engine twice.
Check timing Testing and Inspection.
If necessary, adjust valve timing Adjustments.
Assemble engine.