ARMY TM 9-6115  464 34 AIR FORCE TO 35C2-3-445-2 NAVY NAVFAC P-8-624-34 Table 1-1.  FITS AND TOLERANCES Mfg’s Tolerances Desired Clearance Maximum Maximum Component Allowable Allowable Minimum Maximum Minimum Maximum Wear Clearance CYLINDER BLOCK: 3.7490 3.7510 Cylinder bore dia. 3.7505 3.7515 0.0050 Cylinder bore dia.(Bohn) 0.0005 Cylinder bore out of round 0.0005 0.0030 Cylinder bore taper 3.0665 3.0670 0.0020 Main brg. bore - less brgs. 2.1870 2.1880 Camshaft brg. bore - less brgs. 2.0000 2.0005 Oil pump bore 0.7494 0.7500 Valve tappet bore 0.003 Warpage 0.0005 Milling CRANKSHAFT: 2.8734 2.8744 Main brg. journal dia. 0.0003 0.0030 Main brg. journal out of round 0.0003 0.0020 Main brg. journal taper 0.0020 0.0015 Main brg. run-out at center 2.3730 2.3740 0.0030 Conn. rod journal dia. 0.0003 0.0020 Conn. rod journal out of round 0.0003 0.0020 Conn. rod journal taper 0.1400 0.1700 0.0015 Fillet radii 0.0009 0.0034 Crankshaft main brg. clearance 0.0050 0.0100 0.0070 Crankshaft thrust clearance 4.3100 4.3150 0.0150 Seal surface dia.- rear 1.8740 1.8750 0.0150 Seal surface dia. - front 0.0150 CONN.ECTING ROD: 7.9980 8.0020 Length - c to c 2.5260 2.5270 Bearing bore - less bearings 0.0010 0.0030 Br to crankshaft clearance 0.0050 0.0120 0.0050 Conn. rod side clearance 0.0200 Piston pin bushing bore - less 1.4370 1.4380 bushing 1.2503 1.2508 Piston pin bushing bore 0.0015 CAMSHAFT: 2.0530 2.0540 Bearing journal dia. 1.6890 1.7250 0.0020 Lobe dia. meter - base to tip 0.0010 0.0100 Journal run-out in vee blocks 0.0015 0.0035 0.0040 Bearing clearance 0.0015 0.0055 0.0060 End thrust 0.0120 Back lash camshaft to crank 0.001 0.003 gear PISTON: Clearance in cyl. bore (pull on 5 lb. 8 lb. 1/2 x 0.0050 ribbon) - Clearance    in    cyl.    bore    (pull on1/2 x 0.005 ribbon bore) 3.7445 3.7455 Piston pin bore 1.2500 1.2502 0.0010 Width of ring groove - top - Keystone 1/8 nom. Width of ring groove - 2nd & 3rd comp 0.0975 0.0990 0.0050 Width of ring groove - top - oil control 0.1880 0.1895 0.0050 Width of ring groove - lower oil control 0.1880 0.1890 0.0050 PISTON PIN: Length 3.0350 3.0400 ’ Diameter 1.2498 1.2499 0.0020 Clearance in piston 0.0000 0.0005 0.0020 Clearance in connecting rod 0.0005 0.0012 0.0050 1-14  Change 1