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 TM 55-1905-219-14-5
3-97.1 CRANKSHAFT BEARINGS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (Cont)
3. Inspect the backs of
If such spots
the bearing shells
are present,
for bright spots
discard the
which indicate they
bearing shells.
have been moving in
the bearing caps or
bearing supports.
4. Measure the thickness
of the bearing shells
at point "C", 90from
the parting line.
Tool J4757, placed
between the bearing
shell and a micrometer,
will give an accurate
measurement. The bear-
ing shell thickness
will be the total
thickness of the steel
ball in the tool and
the bearing shell,
less the diameter of
the ball. This is the
only practical method
for measuring the
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).
Change 2 3-1718
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