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 TM 55-1905-220-14-5
3-97.1. CRANKSHAFT BEARINGS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
4.
Upper
a. Bearing
1. Clean.
and lower
shells
bearing
(4 and
2. Inspect for scoring,
The lower bear-
shells
10),
pitting, flaking,
ing shells
(5 and
etching, loss of bab-
which carry the
12)
bitt, and signs of
load, will nor-
overheating.
mally show
signs of distress
before the upper
bearing shells.
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. 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.
3-1699
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