Crankshaft: Service and Repair

REPLACING CRANKSHAFT (M60)

(Engine removed)

Remove lower timing case cover. Service and Repair

Remove piston. Service and Repair

Remove flywheel.

Remove rear end cover, the procedure is described as part of replacing crankshaft radial sealing ring. Service and Repair




Unfasten taper screw mount on main bearing (Collar screws and spacer screws.)




Remove screws securing main bearing caps.




Remove main bearing covers 1...5.

Lever out crankshaft.




Caution! Note grinding stage of crankshaft for proper bearing shells.

Check bearing clearance on crankshaft:

Install main bearing shells in engine block. Service and Repair




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

Note: Do not twist crankshaft.

Note: To check crankshaft bearing clearance, use old main bearing screws.

No oil is permitted in the blind bores (danger of cracking).

Fit main bearing cover to engine block and tighten down. Service and Repair




Remove main bearing cover and read off main bearing clearance on width of compressed plastic thread with help of measuring scale.




Summary:
Color code / shaft diameter / bearing strength
Ge Yellow
Gn Green
Wh White
(1) Crankshaft
(2) Bearing clearance
(3) Main bearing shells: yellow, green or white
(4) Main bearing cover

Remove plastic thread.

Fit main bearing cover on engine block and tighten down. Service and Repair




Checking axial clearance:

If necessary, check guide bearing shells, crankshaft and engine block.

End float, 0.020 - 0.046 mm




Check connecting-rod bearing clearance:

On each conrod, install one red and one blue conrod bearing shell. (Irrespective of color code on conrod shaft.)

Caution! Note grinding stages on crankshaft for proper bearing shells.

Install piston. Service and Repair




Place piston in BDC setting with special tool 00 2 590 (Plastigage Type PG 1) on oil-free crankshaft.

Install conrod bearing cover in such a way that pair numbers match.

Note: Do not turn the connecting rods or crankshaft. Use the old connecting-rod bolts to check connecting-rod clearance.




Tightening conrod screws:

Use special tool 00 9 120 and special tool 11 2 110.

Tightening torque, Application torque = 5 Nm
Jointing torque = 20 Nm
Torque angle = 80°




Remove conrod bearing cover and read off conrod bearing clearance on width of compressed plastic thread with the help of the measuring scale.

Remove plastic thread.




Summary:
Color code / shaft diameter / bearing strength
Color code 2 classification.
Rt Red
Bl Blue
(1) Crankpin
(2) Bearing clearance
(3) Bearing shells: red or blue
(4) Conrod




If necessary, remove chain wheel from crankshaft.

Fit special tool 11 2 383 to crankshaft.

Remove chain wheel with special tool 11 2 000 in conjunction with special tool 11 2 004.

Installation:
Shrink-fit chain wheel to crankshaft

Check wedge for correct position.

Heat sprocket to max. 150°C with hot air blower or hotplate.

Caution! Do not exceed specified temperature!

Replace main bearing shells on crankshaft. Service and Repair

Replace conrod bearing shells. Service and Repair