|
| |
TM 5-4320-306-24
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 100° to 138°F (38° to 59°C).
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.
4-76
|
