Crankcase, Crankshaft, Main Bearings & Flywheel

Whenever possible, the crankshaft should be removed when new bearings are being installed in order to clean the crankcase thoroughly. All bearing surface must be free of grit and burrs.

B.FLYWHEEL

1.Removal a)Removal of the flywheel required removal of the Engine. b)Remove the clutch assy. c)Remove the six bolts (2-3). d)Using a suitable sling to support it lever the flywheel off the dowels.

2.Inspection and Repair

a)Inspect the flywheel ring gear for excessive wear, chipped and broken teeth.

b)If inspection proves it necessary replace the flywheel ring gear as follows : c)Inspect the clutch friction surface for ridges, scores, grooves, cracks and burn spots. d)Using a straight edge and feeler gauges check the friction face for hollows or high spots. The friction face must be flat and true within 0.006 inch. If necessary, the friction face should be ground to this condition. If suitable grinding equipment is not available the flywheel can be mounted in a lathe and the friction face dressed with emery cloth. If the surface is very rough take a fine cut with a lather tool before dressing the friction face with emery cloth.

1.Be sure the flywheel is exactly centered when rotating it. The friction surface must be parallel with the dial face, deviation of more than 0.05 mm (0.002 in) are not permissible.

2.If ring gear has worked loose on the flywheel, do not attempt by welding remove the loose gear and replace with a new one or replace flywheel with ring gear.

1.Remove the ring gear by heating with a torch or splitting with a chisel and driving off.

2.Heat a new ring gear to 400-5500F and install it ensuring that it is hard against the shoulder on the flywheel. The ring gear must be installed with the lead on the teeth towards the crankcase on diesel engines (1-1). Permissible out of true of ring gear = 0.3 mm (0.012 in).