Quantcast FIGURE   3-82.   Measuring   Piston   Ring   Gap

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ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 (2) (3) (4) Using  an  inverted  piston,  push  piston  ring  into  cylinder  liner  approximately  0.39  in.  (10  mm)  or  to  the  point where diameter of liner is smallest. Using a feeler gage, measure piston ring gap. Standard gap for three compression rings is 0.0079 to 0.0158 in. (0.2 to 0.4 mm). Standard gap for oil ring is 0.0039 to 0.0118 in. (0.1 to 0.3 mm) The limit for gap is 0.0591 in. (1.5 mm), refer to FIGURE 3-82. Inspect piston ring groove for damage or distortion. If damage or distortion is found, replace piston. FIGURE   3-82.   Measuring   Piston   Ring   Gap c. Using a micrometer, measure piston pin OD at several points. Standard OD is 1.063 in. (27.0 mm), with a limit d 1.062 in. (26.97 mm). If OD is less than limit, replace piston pm. d. Check piston pin and piston clearance as follows: (1) Use an inside micrometer to measure piston pin hole in piston. (2) Stand& piston pin hole ID is 1.0525 to 1.0628 in. (26.938 to 25.997 mm). The clearance limit between pin and pin hole is 0.0 to 0.0002 in. (0.0 to 0.095 mm). (3)  lf  clearance  exceeds  limit,  replace  raplace  piston. (4) Use an inside micrometer to measure small end bushings (20, FIGURE 3-77). Replace bushings if ID is not within 1.0633 to 1.0635 in. (27.998 to 27.015 mm). 3-133


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