ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 TABLE 3-6.  Piston and Connecting Rod Component Wear Limits Initial Dimension Maximum Clearance Components inches (mm) inches (mm) Connecting rod small end bushing 0.984 (25.005) 0.985 (25.017) 0.0019 (0.05) Piston pin diameter 0.9839 (24.9925) 0.9842 (24.9975) Cylinder bore 3.386 (86.000) 3.387 (86.025) 0.006 (0.40) Piston diameter - bottom of skirt 3.3815 (85.891) across thrust face 3.3819 (85.901) Piston ring gaps 0.01 (0.260) 0.055 1.40 0.02 (0.510) Top piston ring width 0.0675 (1.715) 0.0685 (1.740) 0.006 (0.16) Top piston ring groove width 0.0708 (1.800) 0.0718 (1.825) 2nd piston ring width 0.077 (1.965) 0.078 (1.990) 0.006 (0.15) 2nd piston ring groove width 0.080 (2.040) 0.081 (2.065) Oil piston ring width 0.156 (3.965) 0.157 (3.990) 0.006 (0.15) Oil piston ring groove width 0.159 (4.030) 0.160 (4.055) Connecting rod big end bore (See Note) 2.107 (53.525) 2.108 (53.545) Bearing shell thickness 0.0685 (1.740) 0.005 (0.12) 0.0689 (1.750) Crankpin diameter 1.968 (49.985) 1.969 (50.000) NOTE Torque connecting rod bolts.  Refer to paragraph 3-30.4. 3-63