TM 5-4310-393-14
a.
Clean piston (3) and wrist pin (Figure 5-39, Item 2) with dry cleaning solvent and dry with low
pressure 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 Parts
NOTE
Visually
inspect
all
piston
components. Take measurements as
indicated.
FIGURE 5-41. PISTON GROOVES
a.
Inspect piston, skirt, and piston grooves for excessive wear and damage Replace damaged piston.
NOTE
Excessively worn piston, rings or cylinder may be an indication of abnormal
maintenance procedures or operating conditions. Check for and correct any
abnormalities.
b.
Examine piston (Figure 5-41, Item 1) for scoring, fretting, pitting, cracks (especially on the interior
surfaces), 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 In
accordance with paragraph 5-6.5.
d.
Measure piston diameter (Figure 5-42, Item 1) along axis "A" and "B". A normal or new piston
diameter should be 2 8724 inches (72 96 mm) If piston is out-of-round, replace piston
5-33
