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 TM 55-1905-221-14-3
6-27.3. CONNECTING ROD BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION (Cont)
of these defects are
present, the bearings
must be discarded.
However, babbitt
plated bearings may
develop minute cracks
or small isolated
cavities on the bearing
surface during engine
operation. These are
characteristics of and
are NOT detrimental to
this type of bearing.
The bearing should not
be replaced for these
minor surface imperfec-
tions. The upper
bearing shells, which
carry the load, will
normally show signs of
distress before the
lower bearing shells
do.
(2)
Inspect the backs of
the bearing shells for
bright spots which
indicate they have
been shifting in their
supports. If such
spots are present,
discard the bearing
shells.
(3)
Measure the thickness
of the bearing shells,
using a micrometer and
ball attachment. The
minimum thickness of a
worn standard connecting
rod bearing shell
should not be less than
.1230 inch (0.3124 cm)
and, if either bearing
6-460
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