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 TM 55-1905-221-14-3
6-28.1
CRANKSHAFT BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
d. Check the clearance between
the main bearings and the
crankshaft journals. This
clearance may be determined
with the crankshaft in place
by means of a soft plastic
measuring strip which is
squeezed between the journal
and the bearing. Measure the
outside diameter of the crank-
shaft main bearing journals
and the inside diameter of the
main bearing shells when
installed in place with the
proper torque on the bearing
cap bolts. When installed, the
bearing shells are .001 inch
(.0025 cm) larger in diameter
at the parting line than 90'
from the parting line.
e. The bearing shells do not form
a true circle when not instal-
led. When installed, the
bearing shells have a squeeze
fit in the main bearing bore
and must be tight when the
bearing cap is drawn down.
The crush assures a tight,
uniform contact between the
bearing shell and bearing seat.
Bearing shells that do not
have sufficient crush will not
have uniform contact, as shown
by shiny spots on the back,
and must be replaced. If the
clearance between any crank-
shaft journal and its bearing
shells exceeds .0060 inch
(.0152 cm), all of the bearing
shells must be discarded and
replaced. This clearance is
.0016 to .0050 inch (.0041
to .0127 cm) with new parts.
6-492
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