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 TM 55-1905-223-24-5
NOTE
Make sure the oil holes are in alignment.
(7)
Use an arbor press to push the bushing (7) into the bore until the sleeve (4) is in contact with the
connecting rod (8).
(8)
Check the alignment of the oil holes. Make sure an 1/8 inch (3.17 mm) diameter rod can move
freely through the connecting rod (8) and bushing (7).
d.
Cut the bore in the piston pin bushing (7).
(1)
Fill the oil holes with soap to prevent metal particles from entering the holes.
(2)
Install the connecting rod (8) in the boring machine.
NOTE
To put the connecting rod in the correct position to cut the bore
in the bushing, use only the two horizontal blades of the lower
mandrel on the machine.
(3)
The instructions for the boring machine are included with the machine.
(4)
Cut the bushing (2) to 2.0010 to 2.0015 inches (50.825 to 50.838 mm) inside diameter.
(5)
Remove the rod (8) from the boring machine and check the bore with a dial bore gauge.
(6)
Remove all sharp edges.
(7)
Remove any metal particles and the soap from the oil holes.
(8)
Wash the bores and holes with mineral spirits and dry with compressed air.
(9)
Use the checking fixture ST-561 to check all the dimensions.
ASSEMBLY
a.
Piston pin.
(1)
Install a new snap ring (7, FIGURE 4-31) in the snap ring groove of the piston pin bore at each
position.
(2)
Heat the pistons (9) in boiling water for 15 minutes or in an oven for 30 minutes at 212 (100 ).
F
C
(3)
Use clean engine oil to lubricate the connecting rod piston pin bore and the piston pin (8).
4-77
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