Crankshaft: Service and Repair

11 21 500 Replacing crankshaft (M57T2)

Special tools required:





Necessary preliminary tasks:
^ Remove engine
^ Remove timing case cover
^ Remove oil pump
^ Remove end cover at rear
^ Remove conrod bearing

Important!
Replace main bearing and conrod bearing bolts.
Replace main bearing and conrod bearing shells.





There must be no oil in the blind holes (risk of cracking).





Release screws.

Remove reinforcement shell (1).





Check crankshaft axial clearance.

Axial clearance.

If the permitted axial clearance is exceeded:
- Check crankshaft and guide bearing shells.
- Replace work parts.

Release screw connections on main bearing from outside to inside.





Remove main bearing caps 1...7.

Important!
Remove camshaft and carefully place to one side.





Note:
Bearing caps 1...5 are marked on exhaust side.

Bearing caps 6 and 7 are not marked.

Bearing cap 6 is installed as a guide bearing.

Important!
Pay attention to oil hole in bearing shell.
Pay attention to installation position of crankshaft bearing shells.





Installation:
Coat bearing shells with oil.

Install crankshaft.

Fit bearing caps 1...7 so that grooves of bearing shell guide are on one side.

Align bearing cap exactly.





Tightening specifications for main bearing:
1. Tighten all screws on main bearing cover with jointing torque.
2. Unfasten screws on main bearing cover 6.
3. Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).
4. Tighten screws of main bearing cover 6 with jointing torque.
5. Tighten down all screws on main bearing caps with special tool 00 9 120 to angle of rotation.
Tightening specification 11 11 1AZ.





Check axial play.

Assemble engine.