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TM 5-4320-313-14
5-11.
PISTON- Continued.
d. Inspection - Continued.
(3) Refer to figure 5-28 and measure piston diameter (1) along axis A and B. A normal or new piston diameter
should be 2.8724 inches (72.96 mm). If piston is worn, replace piston.
NOTE
Install piston rings into the cylinder one at a time and measure the gap.
(4) Measure top ring gap. Measurement must not exceed .030 inch (0.80 mm).
(5) Measure middle ring gap. Measurement must not exceed .060 inch (1.50 mm).
(6) Measure bottom ring gap. Measurement must not exceed .060 inch (1.50 mm).
(7) If ring gap exceeds the dimensions listed above, install a new ringset.
(8) Replace a damaged piston.
Figure 5-28. Measuring Piston Circumference.
e. Repair Refer to figure 5-29).
(1) Install oil control ring (1), compression ring (2), and compression ring (3) on piston (4).
(2) Make sure the piston ring gaps are equally spaced around the piston 120 degrees from each other.
5-42
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