Replacing Connecting Rod Bolts

CAUTION:
- The conrod bolts have different weights.
- Only conrod bolts of the same weight may be installed in an engine.

NOTE:
- If no tightening angle wrench is available, the conrod bolt or conrod nut can be tightened further in a single step by the specified angle using a socket wrench and tommy bar.
- Do not use a flexi-bar torque wrench for tightening to degree settings in order to avoid any angle errors.


Replacing (1st Version) Engine 119.96x
1. Knock out conrod bolts.





2. Press new conrod bolts into the conrod with a pressure of about 45,000 N or knock in with a hammer and drift
Place conrod on a ground steel plate (shop-made tool) when performing this step.
3. Coat conrod nuts and thread and contact surface of conrod bolts With engine oil.





4. Tighten conrod nuts and conrod bolts as follows:
- Initial tightening torque: 55 Nm for new conrod bolt
- Tightening angle 90-100°

CAUTION: It is essential to observe this instruction otherwise the nuts or conrod bolts may slacken.