TM 5-4310-387-14
6-20. Piston and Connecting Rod Assemblies (Cont).
b.
Repair. (figure 6-20)
(1)
Remove piston and connecting rod assemblies (para. a.).
(2)
Remove two retaining rings (1), wrist pin (2), and piston (3) from connecting rod (4). Discard retaining
rings (1).
(3)
Remove two compression rings (5) and oil ring (6) from piston (3).
WARNING
Dry cleaning solvent, PD-680 used to clean parts is potentially dangerous to personnel and
property. Avoid repeated and prolonged skin contact. Do not use near open flame or excessive
heat. Flash point of solvent is 138°F (60°C).
(4)
Clean all items with dry cleaning solvent and dry thoroughly.
(5)
Clean out piston ring grooves.
(6)
Inspect piston (3) and replace if scored, top is pitted, or piston measurement is less than 3.198 in. (81.160
mm).
(7)
Inspect connecting rod (4) and bearing cap (7), and replace if cracked or bent.
(8)
Inspect wrist pin (2) and replace if bent or excessively worn.
(9)
Install oil ring (6) in bottom piston ring groove.
(10)
Install two compression rings (5) in top two piston ring grooves.
(11)
Position piston (3) on connecting rod (4).
(12)
Install wrist pin (2) and secure with two new
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