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TM 9-2815-226-34-1
3-20. INSPECT PISTONS
WARNING
COMPRESSED AIR USED FOR CLEANING PURPOSES WILL NOT EXCEED 30
PSI (207 KPA).
USE ONLY WITH EFFECTIVE CHIP GUARDING AND
PERSONAL PROTECTIVE EQUIPMENT (GOGGLES, SHIELD, GLOVES, ETC.).
P-D-680 SOLVENT IS POTENTIALLY DANGEROUS.  AVOID PROLONGED OR
REPEATED CONTACT WITH SKIN. KEEP AWAY FROM FLAME OR EXCESSIVE
HEAT.
a. Clean pistons in solvent and blow dry with compressed air.
b. Check the piston for cracks, breaks, scoring, galling, and scratches.
c. Inspect all ring grooves for missing sections , breaks, cracks, distortion, and galling.
NOTE
ST-560 ring groove gage consists of four different size gages. Use gage marked
for NTC 400 engine, 5-1/2-in. piston.
d. Check the top and second ring grooves with ST-560 ring groove gage. Shoulders of gage must not touch ring
groove lands. If shoulders of gage touch, discard piston.
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