TM 10-4320-307-24
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CONNECTING ROD AND PISTON ASSEMBLY REPLACE/REPAIR (CONT).
19. If worn or damaged, remove piston pin bushings (7) as
follows:
a.
Clamp connecting rod (6) in a padded vise (14)
with piston pin bushing inserter (15).
b.
Tighten in on bushing inserter (15) nut to push out
bushing (7).
20. Install new piston pin bushings as follows:
a.
Loosen bushing inserter (15) nut and position new
piston pin bushing (7) for assembly, being sure that
oil holes in bushing and connecting rod bore are
lined up.
b.
Tighten in on bushing inserter (15) nut to pull
bushing (7) into connecting rod (6).
ASSEMBLY:
1.
Install piston pins as follows:
a.
Install a new snap ring (1) in one snap ring groove
of piston pin bore (2) in each piston (3).
b.
Heat pistons (3) in boiling water for 15 minutes or
in an oven for 30 minutes at 212°F (100 C).
c.
Lubricate piston pin bushing (4) in connecting rod
(5) and piston pin (6) with lubricating oil.
Wear insulated gloves to prevent injury
from boiling water or heated pistons.
d.
Use tongs to remove heated pistons (3).
CAUTION
The cylinder number stamped on piston top must be toward bearing tang side of
connecting rod.
Do not use a hammer to install piston pins. Use of hammer can result in damage
to piston.
e.
Align pin bore (2) of piston (3) with connecting rod bushing (4) and install piston pin (6).
f.
Install new snap ring (1) in remaining snap ring groove of piston pin bore (2) so that snap ring seats completely in
groove.
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