TM 5-4310-393-14e.Measure piston compression ring groove width(Figure 543, Item 1). Measurement should be 0 0828 to 0 0843 inch(2.100 to 2.143 mm). If measurement is greater than 0.843 in (2.143mm), replace piston.f.Measure piston ring groove (2) width.Measurement should be 0.0811 to 0 0908 inch (2.060 to 2 310 mm). Ifmeasurement is greater than 0 0908 in (2 310 mm), replace piston.g.Measure oil control ring groove (3) width.Measurement should be 0.1582 to 0.1599 inch (4 020 to 4 060 mm). Ifmeasurement is greater than 0 1599 in (4.060 mm), replace pistonWARNINGDRY CLEANING SOLVENT P-D-680 (SAFETY ORSTODDARD'S SOLVENT) IS POTENTIALLYDANGEROUS. AVOID REPEATED ANDPROLONGED BREATHING OF VAPORS AND SKINCONTACT WITH LIQUID. DO NOT USE NEAR OPENFLAME, ARCING EQUIPMENT, OR OTHER IGNITIONSOURCES. ALWAYS WEAR EYE PROTECTIONAND PROTECTIVE CLOTHING. THE FLASH POINTOF P-D-680 IS 100 TO 138 DEGREES F (38 TO 59DEGREES C).FIGURE 5-42. MEASURE PISTONWARNINGDEATH OR SERIOUS INJURY COULD OCCUR IF COMPRESSED AIR IS DIRECTEDAGAINST THE SKIN. DO NOT USE COMPRESSED AIR FOR CLEANING ORDRYING UNLESS THE PRESSURE HAS BEEN REDUCED TO 30 PSI (2.06 BAR) ORLESS. WHEN WORKING WITH COMPRESSED AIR ALWAYS USE CHIP GUARDS,EYE PROTECTION, AND OTHER PERSONAL EQUIPMENT.h.If any groove width measurements are smaller than the minimum values given above, piston ringgrooves may be clogged with carbon deposits. Clean piston with dry cleaning solvent. Dry with low pressure compressedair. Take measurements again.i.Inspect wrist pin for scoring, fretting, pitting, or Indications of overheating. If severely damaged,replace wrist pin.B.Repair.1.Making Minor Repairs.a.Remove slight scoring, or fretting on piston.Clean and repeat procedure If necessary. Refer to Table 5-3 fordimensions, tolerances, and wear limits of parts.C.Replace.1.Replacing/Reinstalling the Piston.FIGURE 5-43. PISTON RING GROOVESa.If the cylinder has been replaced, the piston must also be replaced.5-34
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