Connecting Rod Bearing: Service and Repair

11 24 571 Replace all connecting rod bearings (M57T2- SCR)

Special tools required:





Necessary preliminary work:
^ Removing all pistons

Important!
The connecting rod bearing shells for the connecting rod and the connecting rod bearing cap are different.





Replace connecting rod bolts.





Install the normal connecting rod bearing shell (low version red) in the connecting rod bearing cap.





Install the more wear-resistant "S" connecting rod bearing shell (high version blue) in the connecting rod.

Insert one blue and one red bearing shell for each connecting rod (irrespective of the color coding on the connecting rod shaft).





Important!
Note grinding stages on crankshaft.





Install piston.

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 turn the connecting rods or crankshaft.

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

Tighten down connecting rod bolts with special tool 00 9 120.

Tightening torque 11 24 1AZ.

Remove bearing caps.

Read off bearing clearance at width of crushed plastic thread (Plastigage) with aid of measuring scale.





Connecting-rod bearing play.

Remove plastigage.





Overview:

Color code/shaft diameter/bearing strength

Rt = red

Bl = blue
1. Crankshaft journal
2. Bearing clearance
3. Bearing shells: red or blue
4. connecting rod





Assemble engine.