Service Specifications Unit :
mm(in.) G424 Service Manual Specifications 14 Item Standard value Limit Remarks Cylinder head Flatness of gasket surface 0.03 (0.0012) Grinding limit 0.2 (0.008) Total resurfacing depth of both cylinder head and cylinder block Overall height 89.9 to 90.1 (3.539 to 3.547) Oversize rework dimensions of valve guide hole 0.05 (0.0020) 13.05 to 13.07 (0.5138 to 0.5146) 0.25 (0.0098) 13.25 to 13.27 (0.5217 to 0.5224) 0.50 (0.0197) 13.50 to 13.57 (0.5315 to 0.5343) Oversize rework dimensions of valve seat ring hole Intake 0.30 (0.0118) 47.30 to 47.33 (1.8622 to 1.8634) 0.60 (0.0236) 47.60 to 47.63 (1.8740 to 1.8752) Exhaust 0.30 (0.0118) 40.30 to 40.33 (1.5866 to 1.5878) 0.60 (0.0236) 40.60 to 40.63 (1.5984 to 1.5996) Camshaft Cam height Intake 41.62 (1.6386) 41.12 (1.6189) Exhaust 41.62 (1.6386) 41.12 (1.6189) Journal diameter 33.935 to 33.950 (1.33602 to 1.33661) Oil clearance 0.05 to 0.09 (0.0020 to 0.0035) Valve Overall length Intake 106.6 (4.197) 106.1 (4.126) Exhaust 105.2 (4.142) 104.7 (4.122) Valve stem projection 42.05 (1.6555) 42.55 (1.6752) Stem diameter Intake 7.960 to 7.975 (0.31339 to 0.31398) Exhaust 7.930 to 7.950 (0.31220 to 0.31299) Face angle 45° to 45.5° Thickness of valve head (margin) Intake 1.2 (0.047) Exhaust 2.0 (0.079) Stem-to-guide clearance Intake 0.025 to 0.058 (0.00098 to 0.00228) Exhaust 0.050 to 0.088 (0.00197 to 0.00346) Valve spring Free height 48.0 (1.89) 47.0 (1.85) Load/installed height 176.5N (18kg) [39.7lbf]/40.4 (1.591) Out-of-squareness 2° or less 4° Valve guide Overall length Intake 47 (1.85) Exhaust 52 (2.05) Inner diameter 8.000 to 8.018 (0.31496 to 0.31567) Valve seat Valve contact width 0.9 to 1.3 (0.035 to 0.051) Sinkage 0.2 (0.008) Piston Outside diameter 86.47 to 86.50 (3.4043 to 3.4055) Piston clearance 0.02 to 0.04 (0.0008 to 0.0016)