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EM-224 [YD] SERVICE DATA AND SPECIFICATIONS (SDS) CYLINDER HEAD Unit: mm (in) VALVE Unit: mm (in) Valve Clearance Unit: mm (in) *1: Approximately 20 ° C (68 ° F) *2: Approximately 80 ° C (176 ° F) Item Standard Limit Head surface distortion Less than 0.03 (0.0012) 0.04 (0.0016) JEM204G Valve head diameter “D” Intake 28.0 - 28.3 (1.102 - 1.114) Exhaust 26.0 - 26.3 (1.024 - 1.035) Valve length “L” Intake 106.72 (4.2016) Exhaust 106.36 (4.1874) Valve stem diameter “d” Intake 5.965 - 5.980 (0.2348 - 0.2354) Exhaust 5.945 - 5.960 (0.2341 - 0.2346) Valve seat angle “ α ” Intake 45 ° 15 ′ - 45 ° 45 ′ Exhaust Valve margin “T” Intake 1.38 (0.0543) Exhaust 1.48 (0.0583) Valve margin “T” limit More than 1.0 (0.039) Valve stem end surface grinding limit Less than 0.2 (0.008) SEM188 Item Cold*1 Hot*2 (reference data) Intake 0.24 - 0.32 (0.0094 - 0.0126) 0.274 - 0.386 (0.011 - 0.015) Exhaust 0.26 - 0.34 (0.0102 - 0.0134) 0.308 - 0.432 (0.012 - 0.017) |