TM 5-4310-393-14a.Clean piston (3) and wrist pin (Figure 5-39, Item 2) with dry cleaning solvent and dry with lowpressure compressed air.b.Remove carbon from piston ring lands and grooves.c.Clean inside surface of piston and piston skirt.d.Clean piston pin bore.3.Checking all the PartsNOTEVisually inspect all pistoncomponents. Take measurements asindicated.FIGURE 5-41. PISTON GROOVESa.Inspect piston, skirt, and piston grooves for excessive wear and damage Replace damaged piston.NOTEExcessively worn piston, rings or cylinder may be an indication of abnormalmaintenance procedures or operating conditions. Check for and correct anyabnormalities.b.Examine piston (Figure 5-41, Item 1) for scoring, fretting, pitting, cracks (especially on the interiorsurfaces), damaged ring grooves, or for indications of overheating Repair slight scoring according to repair procedures.Replace damaged piston.c.If piston is badly worn, check cylinder for excessive out-of-round, high spots, or other damage Inaccordance with paragraph 5-6.5.d.Measure piston diameter (Figure 5-42, Item 1) along axis "A" and "B". A normal or new pistondiameter should be 2 8724 inches (72 96 mm) If piston is out-of-round, replace piston5-33
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