TM 9-2320-289-34
3-13.
PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING REMOVAL
AND REPAIR (Con’t).
b.
DISASSEMBLY
WARNING
Always wear goggles when removing piston pin retainers (6). Failure to
follow this warning may result in serious injury to personnel.
1.
Remove 2 piston pin retainers (6).
Remove piston pin (7) and separate
piston (8) from connecting rod (14),
Remove 2 bolts (13) only if damaged.
2.
Expand upper compression ring (12)
and slide from groove in piston (8).
Repeat for lower compression ring
(11 ), oil control ring (1 O), and oil ring
I
expander (9).
c.
CLEANING AND INSPECTION
1.
2.
3.
4.
5.
Wipe oil from crankshaft journals, and
upper and lower connecting rod
bearing shells.
Inspect connecting rod bearings for
scoring or damage. Replace if scored
or damaged.
Inspect connecting rod (14) for bends
or twists. Replace connecting rod and
connecting rod cap if connecting rod
is bent or twisted,
Measure
connecting
rod journal
diameter.
Diameter
should be
2.3970-2.3981 in.
(60.875-60.913
mm), Replace crankshaft if diameter
is not correct. (See paragraph 3-15)
Measure diameter of crankshaft
journal at several points and compare
readings.
Maximum difference in
diameter (out-of-round) should be
0.0007 in. (0.01 77 mm). Replace
crankshaft if out-of-round.
(See
paragraph 3-1 5)
TA50650
3 - 3 8
