Cylinder Block Assembly: Service and Repair

11 21 500 - Replacing crankshaft (M52/S52/M52TU/M54/M56)

(engine removed)





Necessary preliminary tasks:
- Removing cylinder head
- Removing lower timing case cover
- Removing all pistons Service and Repair
- Remove end cover at rear; this operation is described in the section Replacing crankshaft radial seal Service and Repair.





Checking axial clearance:
If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary,
end float Crankshaft and Bearings M54.





Unfasten screw connection on reinforcement plates.

Note:
The reinforcement plates are not fitted on engines with gray cast iron engine blocks or on engines with oil pumps integrated in oil scrapers.





Unfasten screw connection on main bearing.
Remove main bearing caps (1 to 7).
Lever out crankshaft.





If necessary, release incremental gear.

Installation:
Replace screws.
Install screws and tighten down in two passes.
Tightening torque 11 21 1AZ 11 21 Crankshaft and Bearings.





Important!
Check grinding stage of crankshaft Crankshaft and Bearings M54.





Replace main crankshaft bearing shells Service and Repair.
Replace conrod bearing shells Removal and Replacement.
Replace grooved ball bearings in crankshaft Replacing Grooved Ball Bearing In Crankshaft (M52/S52/M52TU/M54/S50/S54).