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 TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
f. Pistons and Connecting Rods (cont).
REMARKS
ACTION
ITEM
LOCATION
STEP
CLEANING (cont)
WARNING
Wear safety glasses when drying parts with compressed air, Fail-
ure to do so could cause serious injury to eyes and possible blind-
ness. If you hurt your eyes or if a foreign object is blown into
your eyes, seek medical attention immediately.
Use cleaning solvent P-D-680. Dry thor-
Clean
All parts
6
oughly with moisture free compressed
air or clean cloth
Remove carbon from piston using care
Clean
a. Overall
Piston (4)
7
not to scratch piston
Use groove cleaning tool
Clean
b. Piston ring
groove
Use small drill or fine wire
Clean
c. Piston oil hole
INSPECTION
Inspect for cracks, damage, scoring, evi-
Inspect
a. Overall
Piston(4)
8
dence of overheating and damaged ring
grooves. If any of these conditions ob-
served, replace piston
Use bore gage and measure two places,
Measure
b. Piston pin bore
90 degrees apart. Replace piston if dia-
diameter
meter is greater than 1.2508 inches
Use feeler gauage. If measurement exceed:
Measure
C.
Oil ring side
0.005 inch, replace piston
clearance
4-45
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