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 TM 55-1905-220-14-4
3-41. CRANKSHAFT BEARINGS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont)
Before installing new replacement bearings, it is very important to thoroughly inspect the crankshaft journals.
Very often, after prolonged engine operation, a ridge is formed on the crankshaft journals in line with the journal
oil holes. If this ridge is not removed before the new bearings are installed, then, during engine operation,
localized high unit pressures in the center area of the bearing shell will cause pitting of the bearing surface.
Also, damaged bearings may cause bending fatigue and resultant cracks in the crankshaft. Refer to paragraph
Do not replace one main bearing shell alone. If one bearing shell requires replacement, install both new upper
and lower bearing shells. Also, if a new or reground crankshaft is to be used, install all new bearing shells.
5. Upper
Thrust
Inspect.
If the washers
and
washers
are scored or
lower
(14 and
worn excessive-
thrust
16)
ly or the
washers
crankshaft end
play is exces-
sive, they must
be replaced.
Improper clutch
adjustment can
contribute to
excessive wear
on the thrust
washers. In-
spect the
crankshaft
thrust surfaces.
If, after dres-
sing or re-
grinding the
thrust surfaces,
new standard
size thrust
washers do not
hold the crank-
shaft end play
within the spec-
ified limits,
it may be nec-
essary to in-
3-885
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