Connecting Rod Bearing: Service and Repair

11 24 571 Replacing all connecting rod bearings (N63 hybrid)

Special tools required:





Warning!
High-voltage system - danger to life!





Important!
Note grinding stages on crankshaft.





Necessary preliminary tasks:
^ 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:





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 clearance.

Piston in BDC position.

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

Fit bearing caps so that pair 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 measurement 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.