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 TM 55-1905-220-14-7
3-172.1. CRANSHAFT BEARINGS - MA INTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont)
3. Inspect the backs
If such spots
of the bearing
are present,
shells for bright
discard the
spots which indi-
bearing shells.
cate they have been
moving in the bear-
ing caps or bearing
supports.
4. Measure the thickness
of the bearing shells
at point "C", 90
(32.22 ) from the
C
parting line. Tool
J5347-01, placed be-
tween the bearing shell
and a micrometer, will
give an accurate meas-
urement. The bearing
shell thickness will
be the total thickness
of the steel ball in
the tool, and the bear-
ing shell, less the
diameter of the ball.
his is the only prac-
tical method for meas-
uring bearing thickness,
unless a special micro-
meter is available for
this purpose. The
minimum thickness of a
worn standard main
bearing shell is .1540
inch (0.3912 cm) and,
if any of the bearing
shells are thinner than
this dimension, replace
all of the bearing
shells. A new standard
bearing shell has a
thickness of .1545 to
.1552 inch (0.3932 to
0.3957 cm).
3-2954
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