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TM 10-4320-324-14
b.
Cleaning/Inspection.
WARNING
Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use only in a well
ventilated area. Avoid contact with skin, eyes, and clothes and don't breathe vapor. Do not use near open flame
or excessive heat. The flash point is 100F-138F (38-50C). If you become dizzy while using cleaning solvent,
get fresh air immediately and get medical aid. If contact with eyes is made, wash your eyes with water and get
medical aid immediately.
Compressed air used for cleaning purposes will not exceed 30 psi. Use only with effective chip guarding and
personal protective equipment (goggles/shield, gloves, etc).
(1) Clean parts in solvent P-D-680, Type II. Dry all parts using a clean shop rag.
NOTE
All measurements are according to Table 6-1.
(1) Inspect piston (1) for damage or visible wear,
including bosses. Measure diameter of piston at
position A Normal diameter is between 3.9331
in. (99.901 mm) to 3.9338 in. (99.919 mm). If
not in range, replace piston.
(2) Measure outside diameter of pin (2) at position
B. Normal diameter is between 0.0015 in.
(0.04 mm) to 0.0035 in. (0.091 mm). If not in
range, replace pin.
(3) Measure ring grooves on piston (Table 6-1).
(4) Measure trapezoidal ring (3), taper-faced ring
(4), and oil control ring (5) at position C (Table
6-1). Insert each piston ring (one at a time) into
cylinder and press down with piston to a
distance
of
30
mm
from
cylinder
head
contacting surface. Measure gap of piston ring
and compare with gap clearance in Table 6-1. If
measurement is wrong, replace ring.
(5) Make all necessary measurements of piston (1)
and connecting rod (6) assemblies according to
table 6-1.
6-43
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