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 TM 5-2420-224-34
PISTONS, RINGS, CONNECTING RODS, AND BEARINGS REPLACEMENT
(CONT)
3.
REMOVE and DISCARD two bearing HALVES
(6 and 7) from upper and lower connecting
rods (4 and 2).
4.
REMOVE two retaining rings (8), pin (9), and
PISTON (3) from upper connecting rod (4).
IF DAMAGED, REMOVE BUSHING (10).
5.
REMOVE and DISCARD four RINGS (11, 12,
6.
13, and 14).
7.
REPEAT STEPS 1 thru 6 for remaining pistons.
Check ring grooves and make sure all carbon
deposits have been removed.
Connecting Rod Bushings
1.
Inspect connecting rods for cracks, bends,
In.
(mm)
and warpage. If any of these conditions exist,
Normal
1.540
(39.075)
replace connecting rod with connecting rod of
1.538
(39.045)
s a m e color code. Maximum permissible
d i f f e r e n c e in weight between any two
Repair Stage I
1.547
(39.275)
connecting rods is 0.7 oz (20 g).
OD
1.546 (39.245)
2.
M e a s u r e inside diameter of small end
1.559
Repair Stage II
(39.575)
bushing. Measurement should be 1.42 in,
1.558
(39.545)
(36.03-36.04 mm). If measurement is
exceeded, replace bushing with appropriate
Rough Dimension
1.391
(35.300)
size bushing.
1.389 (35.250)
ID
Finished
1.420
(36.040)
Dimension
1.419
(36.030)
13-32
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