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TM 55-1905-220-14-4
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
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 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.
3-848


 


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