Connecting Rod Bearing: Service and Repair

11 24 571 Replacing all connecting rod bearings (N63)

Special tools required:





Important!
Note grinding stages on crankshaft.





Necessary preliminary work:
^ Removing all pistons





Install new connecting rod bearing shells.

Install one blue bearing shell (1) and one red bearing shell (2) in each connecting rod.

Install piston.





Installation note:
The bearing shells on the connecting rod are coded.

Connecting rod bearing cap (1): the red bearing shell is fitted and the fastening notches are on the left and right sides of the bearing shell (see arrows).

Connecting rod (2): the blue bearing shell is fitted and the fastening notches are one side of the bearing shell (see arrows).





Check connecting-rod bearing play.

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage type PG 1) to oil-free crankshaft.

Fit bearing caps so that matching numbers match up.





Important!
Do not distort connecting rods or crankshaft.

Use connecting rod bolts to check connecting-rod bearing play.

Connecting rod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ.





Remove bearing cap and read off bearing play at width of flattened plastic thread with assistance of measuring scale.

Connecting-rod bearing play.
- Remove plastic thread.
- Lubricate crankshaft and bearing shells.
- Install new connecting rod bolts.





Secure connecting rod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ.





Assemble engine.