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TM 5-4320-305-24
4-10. REPLACE/REPAIR PISTON ASSEMBLY (Continued)
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard's
Solvent) is potentially dangerous. Avoid repeated and
prolonged breathing of vapors and skin contact with the
liquid. Do not use near open flame, arcing equipment, or
other ignition sources. Always wear eye protection and
protective clothing.
The flash point of P-D-680 is 1000 to 1380F (38° to 590C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air for
cleaning or drying unless the pressure is/has been
reduced to 30 psi (2.11 kgcm2) or less. When working with
compressed air always use chip guards, eye protection,
and other personal protective equipment.
11 If any axial ring clearance measurements are smaller than the minimum values given above, piston ring
grooves may be clogged with carbon deposits. Reclean piston with dry cleaning solvent and wire brush.
Dry with compressed air. Take measurements again. If still smaller than minimum values, piston is
damaged or defective. Replace piston.
CAUTION
Small-end bushing in connecting rod may be damaged
if piston pin is refinished. Do not refinish highly
polished or lapped piston pin surface.
12 Inspect piston pin (1) for scoring, fretting, pitting, or indications of overheating. If damaged, replace
piston pin.
13 Measure piston pin (1) for wear and check alinement. Measure alinement with beveled steel straightedge
(2). This measurement will also indicate relative wear along the piston pin. Measure diameter of piston
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