Timing Chain: Service and Repair

11 31 052 Replacing Both Timing Chains (N63)

Special tools required:







WARNING:
Burning hazard. Wear gloves.







Necessary preliminary work:
- Remove lower timing case cover
- To facilitate removal and installation of timing chains, turn engine over with special tool 00 2 300.







Timing drive, cylinders 1 to 4.
Remove guide rail (5) from bearing bolt.
Remove timing chain (3) with tensioning rail (4) from bearing bolt.

Timing drive, cylinders 5 to 8.
Remove guide rail (1) from bearing bolt.
Remove timing chain (2) with tensioning rail (6) from bearing bolt.







Timing drive, cylinders 1 to 4.
Release bearing bolts (2) with a suitable tool.
Tightening torque: 11 31 1 AZ.

Timing drive, cylinders 5 to 8.
Release bearing bolts (1).
Tightening torque: 11 31 2 AZ.







Attach special tools 11 2 001 and 11 2 002 to the crankshaft.
Insert special tool 11 2 007 and remove sprocket wheel with special tool 11 2 003.

Installation note:
Check sprocket wheels for wear, replace if necessary.
Heat sprocket wheel to 60 °C.

WARNING: Burning hazard. Wear gloves.







Installation note:
Make sure Woodruff key (1) is installed in correct position in crankshaft (2).







Installation note:
Maintain tension of timing chains when installing timing case cover.
Observe sparking protection on timing case cover.
Make sure timing chain (1) is correctly installed when placing it in guide rail (3).

Assemble engine.