PISTON ASSEMBLY (CONT) - TM-5-4320-302-14

PISTON ASSEMBLY (CONT) - TM-5-4320-302-14_510

PISTON ASSEMBLY (CONT) - TM-5-4320-302-14_512

TM-5-4320-302-14 Forward Area Water Point Supply System (FAWPSS) Model WP55100 NSN 4320-01-168-1629 and Model 9095-91 NSN 4320-01-338-3305 Manual
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TM 5-4320-302-14 6-16. PISTON ASSEMBLY (CONT) Location/Item Action Remarks 17. Piston ring a. Measure piston ring side side clear- clearance with new piston ance rings only. Measure side clearance of each piston ring with feeler gage in its corresponding piston ring groove in accordance with the chart below. NORMAL SIDE SIDE CLEARANCE CLEARANCE WEAR LIMIT inches inches PISTON RING (millimeters) (millimeters) First or trapezoidal 0.0041 to 0.0057 0.0197 ring (0.105 to 0.145) (0.5) Second or taper 0.0035 to 0.0048 0.0118 piston ring (0.090 to 0.122) (0.3) Third or oil control 0.0016 to 0.0028 0.0059 ring (0.040 to 0.072) (0.15) b. If piston ring side clearance for any piston ring is less than normal lower limit value given in chart, replace piston ring and measure side clearance again. If condition still exists, replace piston. If side clearance for any piston ring exceeds wear limit in chart, replace piston. Also replace cylinder, if necessary. 18. Pistons, If piston replacement is necessary, piston rings cylinders, must also be replaced. Normal sized pistons/ and piston cylinders require normal sized piston rings. rings Oversized pistons/cylinders require oversized piston rings. 6-117

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