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 TM 55-1905-221-14-3
6-28.1
CRANKSHAFT BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)I
f.
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 3-32.2 under
Crankshaft Inspection for
removal of ridges and
inspection of the
crankshaft.
g. 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.
6-493
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