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 TM 55-1905-220-14-7
3-172.1. CRANSHAFT BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont)
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 3-172.2 under Crankshaft Inspection for removal of ridges and inspection of the crankshaft.
d. 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
(11 and
worn excessive-
thrust
13)
ly or the crank-
washers
shaft end play
is excessive,
they must be
replaced. Im-
proper clutch
adjustments can
contribute to
excessive wear
on the thrust
washers. In-
spect the crank-
shaft thrust
surfaces. If
after dressing
or regrinding
the thrust sur-
faces, new
standard size
thrust washers
do not hold the
crankshaft end
play within the
specified lim-
its, it may be
necessary to
install an over-
size thrust
3-2957
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