Connecting Rod: Service and Repair

Connecting Rod

The material of connecting rods was changed since February, 1984. This did not change the weight. New and old connecting rods can be installed together in one engine.





Old
Sintered connecting rod, Part No. 944 103 001 00 (rough part number on inside of conrod shaft).

New
Cast connecting rod, Part No. 944 103 001 01 (rough part number reduced on both sides on conrod base and conrod cap).



Connecting Rod Nuts

The bearing surface of conrod nuts was also changed due to the connecting rod material change.





Old
Smooth bearing surface, Part No.928 103 17201.

New
Ribbed bearing surface, Part No.928 103 17202.

After depletion of stocks, only the new version (ribbed bearing surface) conrod nuts will be available.



Note:
- The old (smooth) conrod nuts must never be used with the new cast connecting rods.
- It is recommended to use the new connecting rod nuts each time the engine is repaired.
- Tightening torque: 75 Nm.
- The tightening torque of 57 + 5 Nm is still applicable to smooth connecting rod nuts used together with sintered steel connecting rods.