CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE
NOTE: All crankshafts must be hardness checked
before regrinding. Bearing failures can cause
overheating of crankshaft journals, resulting in
reduction of hardness.
Inspect the crankshaft gear teeth and splined collar
for wear and chipping. Replace damaged parts as
Visually inspect the drilled holes in the main and
connecting rod journals to assure that all passages
are open after cleaning.
Repair the Crankshaft as follows:
Special precautions must be taken during grinding when
regrinding the crankshaft. The following MUST be
adhered to when regrinding or the crankshaft can be
IMPORTANT: All 466 Series engines have fillet-
NOTE: Due to the exacting standards and controls
for shaft regrinding, it is recommended that this
work be done by I.H. ReNEWed Stations. However,
regrind locally where equipment experience can
produce quality standards. Proceed as follows:
Check for hardness as described earlier in this
Crankshafts may be straightened ac-cording to
Crankshaft straightening is required when
main bearing journal runout is in excess of
.007 T.I.R. checked at #4 main bearing.
Check runout with #1 and #7 main bearing journal
in V blocks When straightening, support crank-
shaft on #1 and #7 main journals, straightened with
the deflection of #4 main journal limited by a
positive stop to A (see chart).
Apply straightening force to #4 main journal.
Magnaglo or Magnaflux inspected for cracks after
straightening is completed. Crankshaft must not be
deflected more than the indicated limit at #4 main
journal. Crank-shaft must be demagnetized after
Grind crankshaft observing the following
Use only a mechanical or an automatic
wheel dresser to prevent chatter, burring
and poor surface finish.
Select the appropriate grinding wheel. An
aluminum-oxide wheel with a 50 grit
surface and maximum hardness of M, is
recommended to reduce the possibility of
burns during grinding.
Straight-cutting oils are recommended as
the best coolant for grinding crankshafts.
PRINTED IN UNITED STATES OF AMERICA