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 TM 55-1905-220-14-4
3-40.3. CONNECTING ROD BEARINGS - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECTION Cont)
2. Inspect the backs of
If such spots
the bearing shells for
are present,
bright spots which
discard the
indicate they have
bearing shells.
been shifting in their
supports.
3. Measure the thickness
The minimum
of the bearing shells)
thickness of a
using a micrometer and
worn standard
ball attachment.
connecting rod
bearing shell
should not be
ess than .1230
inch (0.3124
cm) and, if
either bearing
shell is thin-
ner than this
dimension,
replace both
bearing shells.
A new standard
bearing shell
has a thickness
of .1238 to
.1243 inch
(0.3145 to
0.3157 cm).
4. Connec-
Bearing
Inspect for burns,
ting rod
bore
foreign particles and
so forth.
5. Crank-
Bearing
Check the clearance
This clearance
shaft
shells
between the connecting
may be checked
journal
rod bearing shells
by means of a
and the crankshaft
soft plastic
journal.
measuring strip
which is
squeezed be-
tween the jour-
nal and the
bearing. The
3-849
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