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 TM 55-1905-221-14-3
6-28.1
CRANKSHAFT BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
5
Upper and
Inspect thrust washers. If
Lower
the washers are scored or worn
Thrust
excessively or the crankshaft
Washers
end play is excessive, they
must be replaced. Improper
clutch adjustments can
contribute to excessive
wear on the thrust washers.
Inspect the crankshaft
thrust surfaces. If after
dressing or regrinding the
thrust surfaces, new standard
size thrust washers do not
hold the crankshaft end play
within the specified limits,
it may be necessary to install
an oversize thrust washer on
one or both sides of the rear
main bearing. A new standard
size thrust washer is .1190 to
.1220 inch (.3023 to .3099 cm)
thick. Thrust washers are
available in .005 and .010
inch (.0127 and .0254 cm)
oversize.
INSTALLATION
6. Upper Bearing
a. Clean and lubricate the
Use clean engine
Numbers 1
upper bearing shells (4).
oil.
Through 6
NOTE
The upper and lower main bearing shells are not alike: the upper bearing shell is
grooved and drilled for lubrication - the lower bearing shell is not. Be sure to install the
grooved and drilled bearing shells in the cylinder block and the plain bearing shells in the
bearing caps. Otherwise, the oil flow to the bearings and to the upper end of the
connecting rods will be blocked off. Used bearing shells must be reinstalled on the same
journal from which they were removed.
6-494
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