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 TM 55-1905-219-14-7
3-172.1. CRANKSHAFT BEARINGS - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
4. Upper
a. Bearing
1. Clean.
and lower
shells
bearing
(4 and
2.
Inspect for scoring,
The lower
shells
10),
pitting, flaking,
bearing
(5,
etching, loss of bab-
shells which
and
bitt, and signs of
carry the
12)
overheating.
load, will
normally
show signs
of distress
before
the upper
bearing
shells.
However, bab-
bitt plated
bearings may
develop minute
cracks or small
isolated cavi-
ties on the
bearing surface
during engine
operation.
These are char-
acteristics of
and are not
detrimental to
this type of
bearing. They
should not be
replaced for
these minor
surface imper-
fections since
function of the
bearings is in
no way impaired
and they will
give many addi-
tional hours of
trouble-free
operation.
3-2989
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