TM 5-4320-302-146-16.PISTON ASSEMBLY (CONT)Location/ItemActionRemarks9.Piston pin boreMeasure piston pin bore on X and Y axis with precision bore gage. Measurement shouldbe 1.3781 to 1.3783 inches (35.004 to 35.01 mm). If bore measurement is larger than1.3783 inches (35.01 mm) or is out-of-round, replace piston. This is also an indication ofunusual wear. Check cylinder in accordance with paragraph 6-15 and also connectingrod in accordance with paragraph 6-17.10. Trapezoidal ring grooveMeasure axial clearance with piston ring groove gage No. 130360. Insert gage into ringgroove. If a gap exists between the inserted gage and the piston, the axial ring clearanceis 0.1 to 0.1064 inch (2.54 to 2.702 mm) and the piston is still usable. Do not replacepiston. If the gage contacts the side of the piston with no gap, the axial ring clearance istoo great and the piston must be replaced.11. Taper piston ring grooveMeasure axial ring clearance with standard clearance gage. Measurement should be0.1016 to 0.1024 inch (2.58 to 2.60 mm). If measurement is greater than 0.1024 inch(2.6 mm), replace piston.6-112
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