SERVICE DATA 1.2 Basic engine Table 2-2 Maintenance service data table - Basic engine (1 / 4) Unit:
mm [in.] 2-3 Inspection point Nominal Standard Limit Remark Rocker Rocker bushing inside diameter ø 19 [0.75] 19.010 to 19.030 [0.7484 to 0.7492] Rocker shaft outside diameter ø 19 [0.75] 18.980 to 19.000 [0.7472 to 0.7480] Clearance between rocker bushing and shaft 0.010 to 0.050 [0.0004 to 0.0020] 0.070 [0.0028] Valve and valve guide Valve stem outside diameter Inlet ø 8 [0.31] 7.940 to 7.955 [0.3126 to 0.3132] 7.900 [0.3110] Exhaust ø 8 [0.31] 7.920 to 7.940 [0.3118 to 0.3126] 7.850 [0.3091] Clearance between valve stem and guide Inlet 0.065 to 0.095 [0.0026 to 0.0037] 0.150 [0.0059] Exhaust 0.080 to 0.115 [0.0031 to 0.0045] 0.200 [0.0079] Valve guide mounting dimension 14 [0.55] 13.9 to 14.1 [0.547 to 0.555] Valve seat Valve seat angle 30° Seat width Valve Valve Valve sinkage margin seat angle Valve sinkage Inlet 0.4 [0.016] 0.3 to 0.5 [0.012 to 0.020] 1.0 [0.039] Exhaust 0.5 [0.020] 0.4 to 0.6 [0.016 to 0.024] 1.0 [0.039] Seat width 1.4 [0.055] 1.26 to 1.54 [0.0496 to 0.0606] 1.8 [0.071] Valve margin 2.13 [0.0839] Refacing permissible up to 1.83 [0.0720] Valve spring Free length 48.85 [1.9232] 47.60 [1.8740] Perpendicularity A = 1.5°or less B = 1.3 [0.051] or less Lf = 48.85 [1.9232] B = 1.5 [0.059] at the end A B Lf Set length/set load 43 mm [1.69 in.]/ 176 to 196 N {18 to 20 kgf} [39 to 44 lbf] 43 mm [1.69 in.]/ 147 N {15 kgf} [33 lbf] Pushrod Runout 0.6 [0.024] or less 0.6 [0.024] Runout (dial gaule reading) when push rod is supported along center line of spheri- cal surface at either end.
Cylinder head Distortion of bottom face 0.05 [0.0020] or less 0.20 [0.0079] Reface minimum thickness. Compressed thickness of gasket 1.2 [0.047] 1.20 ± 0.05 [0.0472 ± 0.0020] Cylinder Inside diameter ø 94 [3.70] 94.000 to 94.035 [3.7008 to 3.7022] Repair limit: 94.200 [3.7087] Replace limit: 94.700 [3.7283] Refinish cylinder to 0.25 [0.0098] or 0.50 [0.0197] oversize of nominal valve by honing. Use oversize piston and pis- ton ring. Circularity 0.01 [0.0004] or less Cylindricality 0.015 [0.0006] or less