TM 5-4310-393-14 Max. Item Size Size Perm. Remarks (In) (mm) Wear (in) Exhaust valve head diameter Valve clearance. Valve guide bore diameter. Outside diameter Bore for valve guide in cylinder head Inserting pressure Valve guide protrusion. Rocker bore diameter. Rocker shaft diameter Rocker radius. Rocker axial play. Valve seat ring seat angle. Crankshaft Roughness RA.  (m) Crank pin width. Hardness at crank pin.  (RC) Hardness depth at crank pin. Diameter of crankpin (new engine) 1.197/ ± 0.004 0350/ .0177 0.2756/ 0.2760 0.3948/ 0.3946 0.3941/ 0.3937 220 lb. 0.165/ 0.157 0.7099/ 0.7096 0.7084/ 0.7080 0.315 0.008/ 0.026 45 deg. 0.3 1.2992/ 1.3017 50/55 0.043/ 0.060 1.6512/ 1.6508 30.4/ ± 0.1 0.9/0.45 7.009/ 7.000 10.029/ 10.023 10.011/ 10.000 100 kg 4.2/4.0 18.033/ 18.024 17.994/ 17.983 8 0.20/ 0.65 33.062/ 33.000 1.1/1.5 42.00/ 41.93 0.002 0.002 0.002 Attention: Valve clearance must not be less than 0.018 in (0 45 mm) otherwise there is danger of valve head touching the piston.    The  cylinder  head  can be  machined  up  to  a  max.    of .0196 in (0 5 mm) provided the minimum valve clearance is maintained. With cylinder head cold. Valve guides without collar only. After pressing in. No flattening permitted. Bearing  clearance  new  .0018- .0030 in (0.046-0.076 mm) Max.  permissible bearing clearance 0.009 in (0.23 mm). Out-of-round over total length max.  0.0002 in (0.005 mm) Max.  permissible out-of-round of crankpin 0.0020 in (0.05 mm).  Amount of taper over total length max.  0.00012 in (0.003 mm). 5-3