Connecting Rod Bearing: Service and Repair

11 24 571 - Replacing all connecting rod bearings (M52/S52/M52TU/M54/M56)





Special tools required:
- 00 2 590 00 2 590 Plastigage (5)
- 00 9 120 00 9 120 Torque Angle Measuring Dial
- 11 2 110

(piston removed)





Important!
Note grinding stages on crankshaft Crankshaft and Bearings M54.

Install new conrod bearing shells.

Insert one blue (1) and one red (2) bearing shell (irrespective of the color coding on the conrod shaft).





Install piston Service and Repair.





Check conrod bearing clearance.

Piston in BDC position.

Fit special tool 00 2 590 00 2 590 Plastigage (5) (Plastigage Type PG 1) to oil-free crankshaft.

Fit bearing caps so that pair numbers match up.





Important!
Do not distort conrods or crankshaft.

Use the old conrod bolts to check conrod clearance.

Tighten down conrod bolts with special tool 00 9 120 00 9 120 Torque Angle Measuring Dial or with special tool 11 2 110.

Tightening torque 11 24 1AZ 11 24 Connecting Rods and Bearings.





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

Conrod bearing clearance Crankshaft and Bearings M54.

- Remove plastic thread.
- Coat crankshaft and bearing shells with oil.
- Install new conrod bolts and tighten down.
Tightening torque 11 24 1AZ 11 24 Connecting Rods and Bearings.