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 TM 55-1905-221-14-3
6-27.2. CONNECTING ROD - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECTION
4. Connecting
Inspect connecting rod (3) for
Rod
cracks. Magnetic particle is the
preferred method.
5. Connecting
Check the connecting rod bushings
Rod
(9) for indications of scoring,
Bushings
overheating or other damage.
Bushings that have overheated may
become loose and creep together,
thus blocking off the supply of
lubricating oil to the piston pin
and spray nozzle.
6. Piston Pin
Inspect the piston pin (10) for
signs of fretting. Bushings that
have overheated may become loose
and creep together, thus blocking
off the supply of lubricating oil
to the piston pin and spray
nozzle.
When reusing a piston pin, the
highly polished and lapped surface
of the pin must not in any way
be refinished. Polishing or
refinishing the piston pin is not
recommended as it could result in
very rapid bushing wear.
Since it is subjected to downward
loading only, free movement of the
piston pin is desired to secure
perfect alignment and uniform
wear. Therefore, the piston pin
is assembled with a full floating
fit in the connecting rod and
piston bushings, with relatively
large clearances. Worn piston
pin clearances up to .010 inch
(.025 cm) are satisfactory.
6-442
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