Timing Chain: Service and Repair

NOTE:
- Cam chain drive with single-part chain sprocket - flange unit (4-hole chain sprocket) shown.
- Cylinder bank 4 - 6 shown.

CAUTION:
- Before dismantling, set engine cylinder 1 to firing TDC (overlap TDC of cylinder 4).
- Punch marks of both camshafts now point up.

Part 1 Of 4:

Part 2 Of 4:

Part 3 Of 4:

Part 4 Of 4:

Assembly Note


In combination with the use of 4-hole chain sprockets, the following parts are no longer installed on the camshaft drive:

- Thrust Washer
- Compensation Washers
Measurements to ensure that the parts are parallel are therefore no longer required
- Woodruff Key
- Chain Sprocket Flange
- Straight Pin

The holes drilled in the chain sprocket are intended for inserting special tool 9582 (retaining tool). This tool must be used in addition to blocking tools in order to relieve the strain on the camshaft drive when tightening.






- Left chain sprocket (cylinders 1 - 3) part No. 993 105 546 01
- Distinctive feature: flat collar (arrow) high flange





- Right chain sprocket (cylinders 4 - 6) part No. 993 105 546 02
- Distinctive feature: high collar (arrow) low flange

The use of 4-hole chain sprockets, from engine number 61TOO868