These limits may be exceeded if the remaining misalignment is to be ground out of the main
Crankshaft straightening may cause increased runout of the nose section and flywheel pilot. Excessive
runout at these points may be corrected by applying the straightening load to No. 2 main journal to
straighten the nose section runout, or No. 6 main journal to straighten the crankshaft pilot runout (Figure 9-
After straightening, the TIR of either the nose section or crankshaft pilot shall not exceed 0.001 inch (0.03
In performing any of the straightening operations above, the alignment of other sections of the
crankshaft may be adversely affected. Repeat the straightening procedures as necessary until
the crankshaft is within acceptable limits.
Inspect the crankshaft in accordance with step dNO TAG, above, to detect cracks which may have been
caused by the straightening operation. Replace the crankshaft if unacceptable cracks are detected.
Figure 9-45. Straightening Nose Section and Flywheel Pilot Run-out
The weight of the crankshaft Is approximately 850 pounds (383 kg). Use of a lifting device not
rated for this weight may result in damage to components or injury to personnel.
General. A number of precautions should be exercised to hold the risk of grinder bums damage to a
minimum. These precautions are necessary in both the choice of equipment, and in the grinding procedure.