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 TM 55-1905-220-14-5
3-96.3. CONNECTING ROD BEARINGS - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
REMOVAL (Cont)
NOTE
Do not remove another bearing cap or bearing shells.
INSPECTION
3.
Bearing
Bearing failures may result from deterioration (acid
shells
formation) or contamination of the oil or loss of oil.
An analysis of the lubricating oil may be required to
determine if corrosive acid and sulphur are present
which cause acid etching, flaking and pitting. Bear-
ing seizure may be due to low or no oil.
a. Upper
1. Clean the bearings and
If any of these
and
inspect them for scor-
defects are
lower
ing, pitting, flaking,
present, the
shells
chipping, cracking,
bearings must
loss of babbitt or
be discarded.
signs of overheating.
However, babbitt
plated bearings
may develop
minute cracks
or small isola-
ted cavities on
the bearing
surface during
engine opera-
tion. These
are character-
istics of and
are NOT detri-
mental to this
type of bearing.
The bearings
should not be
replaced for
these minor
surface imper-
fections. The
upper bearing
shells, which
carry the load,
will normally
show signs of
distress before
the lower bear-
ing shells do.
3-1667
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