ENGINE 26 VALVE: Description Inlet Exhaust Valve seat angle on valve 450 + 10' 450 + 10' Valve head diameter – 'A' mm 44.10/43.90 36.10/35.90 Valve seat dia on valve – 'C' mm 42.01/41.99 34.01 /33.99 Valve stem diameter – 'E' mm 8.950/8.935 9.940/9.925 Valve seat width – 'D' mm 3.5/2.8 4.2/3.5 Length of valve mm 140.7/140.3 140.7/140.3 Tappet clearance mm 0.20 0.30 Cold or moderately warm engine cooling system temp. 500 max. Permissible runout between valve seat and stem mm 0.03 0.03 Permissible runout between valve head and stem mm 0.2 0.2 Permissible ovality of valve seat mm 0.01 0.01 Minimum thickness of valve 'B' head mm 2.1 2.1 Hardness of valve on stem end HRC 57 + 3 57 + 3 Distance between narrow dia of valve face to contact line mm 0.5 0.5 Distance of valve head to cyl. head parting surface mm 1.2-1.7 1.2-1.7 VALVE TIMING: Fig. 7. Inlet opens Before TDC 290 Inlet closes After BDC 550 53' Exhaust opens Before BDC 530 58' Exhaust closes After TDC 200 51' Fig. 6 Fig. 7 INLET OPENS 290 before T.D.C EXHAUSTCLOSES 200 51’ after T.D.C. T.D.C. INLET OPENS 550 53’ after B.D.C B.D.C. EXHAUSTOPENS 530 58’ before B.D.C
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