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TM 5-2420-222-34
3-11.
PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING MAINTENANCE (Con’t).
NOTE
If one piston ring must be replaced, replace all three piston rings and oil ring expander.
3.
Using piston ring expander, remove two compression rings (14 and 15), oil ring (13), and oil ring expander (12) from
piston (11). Discard rings.
4.
Using retaining ring pliers, remove two retaining rings (10) from piston (11) and piston pin (16).
5.
Push piston pin (1 6) out of piston (11) and sleeve bushing (17). Remove piston from connecting rod (9) and sleeve
bushing.
CAUTION
Do not remove sleeve bushing unless damaged, Removal may damage parts.
6.
Using remover and installer and arbor press, remove sleeve bushing (17) from connecting rod (9).
c.
CLEANING AND INSPECTION
WARNING
Carbon removing compound Is a corrosive liquid. If splashed In eyes, it can cause
blindness. If splashed on skin, it can cause serious burns. Be sure to wear safety
goggles or lenses, rubber apron, and rubber gloves. If accidentally splashed in
eyes or on skin, flush with clean cool water, refer to FM 21-11 for first aid
information, and get medical attention Immediately.
1.
Soak piston in carbon removing compound. Using flexible carbon scraper, scrape piston head clean, then rinse with
water.
2.
Using piston ring groove reconditioning tool, clean piston ring grooves.
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open flame
or excessive heat. The solvent's flash point is 100°F-138°F (38°C-59°C). If you
become dizzy while using cleaning solvent, immediately get fresh air and medical
help. If solvent contacts eyes, Immediately wash your eyes and get medical aid.
3.
Using nonelectrical wire, clean oil holes and flush clean with dry cleaning solvent. Dry thoroughly with clean
4.
Clean connecting rod, piston pin, and sleeve bushing with dry cleaning solvent, then dry thoroughly with a clean
5.
Inspect upper and lower sleeve bearing halves (8 and 4) for cracks, grooves, rough spots, and breaks. Remove rough
spots and minor scratches with abrasive cloth.
6.
Inspect piston for cracks, scoring, or excessive wear or scorching. Pistons badly scored below top ring groove must
be replaced.
7.
Using ring groove wear gage, measure top ring groove. If gage shoulders touch ring land, groove is excessively worn.
3-70
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