ARMY TM 9-2805-257-14 AIR  FORCE  TO  38G2-103-2 NAVY NAVFAC P-8-612-14E Table 5-2. Engine Repair and Replacements Limits (cont). Item PISTON  (cont) Piston  ring  groove Top R-top bottom NOTE: For cylinder size 2.2495 to 2.2515 O-top bottom NOTE: For cylinder size 2.2515 to 2.2535 Second Third Piston  ring  groove  width Top Second Third Piston  rings Width: spacer Top Second Third Thickness:  spacer Top Third Measurements Minimum 1.998 (5.0749) 2.2470 2.2480 2.2490 2.2500 1.950 (4.95300 1.950 (4.95300 0.1205 (0.3060) 0.0995 (0.2527) 0.1880 (.04775) 0.0235 (0.0596) 0.0930 (0.2362) 0.0930 (0.2362) 0.1860 (0.4724) 0.1110 (0.2819) 0.0940 (0.2387) 0.0940 (0.2387) Maximum 2.008 (5.1003) 2.2490 2.2490 2.2500 2.2510 1.960 (4.9784) 1.960 (4.9784) 0.1215 (0.3086) 0.0965 (0.2451) 0.1890 (0.4800) 0.0245 (0.0622) 0.0940 (0.2387) 0.0940 (0.2387) 0.1870 (0.4749) 0.1150 (0.2921) 0.1040 (0.2641) 0.4040 (0.2641) 5-60