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 TM 55-1905-219-14-4
3-40.3.
CONNECTING ROD BEARINGS - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
NOTE
Do not remove another bearing cap or bearing shells.
3. Bearing
Bearing failures may result from deterioration (acid formation) or contamination of the oil or
shells
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. Bearing 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 pre-
lower
ing, pitting, flaking,
sent, the bear-
shells
chipping, cracking,
ings must be
loss of babbitt or
discarded. How-
signs of overheating.
ever, babbitt
plated bearings
may develop min-
ute cracks or
small isolated
cavities on the
bearing surface
during engine
operation.
These are char-
acteristics of
and are NOT de-
trimental to
this type of
bearing. The
bearings should
not be replaced
for these are
minor surface
imperfections.
The upper bear-
ing shells,
which carry
loads will nor-
mally show
signs of dis-
tress before
the lower bear-
ing shells do.
3-862
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