76 486 PL ENGINE P Pre-tension of connecting rod big end bearing shells 0.010/0.040 mm Maximum permissible difference 4.0gms max in weight of connecting rods in one engine Connecting rod big end axial play 0.100-0.400 mm Connecting rod big end clearance 0.035-0.081 mm Small end clearance 0.010-0.021 mm Camshaft journal & bearing bore dimensions : Camshaft bearing Camshaft bearing journal bore journal diameter diameter in cylinder head mm mm Standard 26/26.021 25.960/25.947 Bore dia in 1st 50.00/50.039 mm cap for front oil seals Maximum permissible run 0.025 mm out of cam shaft bearing journal Maximum permissible 0.1/0.3 mm axial play of cam shaft in installed condition Cylinder Head (Dimension) : Permissible unevenness Length wise 0.030mm of cylinder head mating Cross wise 0.015mm surface VALVES : VALVE TIMING At 0.1mm actual lift (i.e. stylus is rested on tappet) INLET OPENS (B.T.D.C) 80 INLET CLOSES (A.B.D.C) 390 EXHAUST OPENS (B.B.D.C) 430 EXHAUST CLOSES (A.T.D.C) 40 Valve Dimension (Fig. 185) INLET EXHAUST mm mm Valve head dia 'A' 32.2/31.8 28.2/27.8 Valve seat angle 450 + 15' 450 + 15' Valve stem dia 'E' 5.975/5.961 5.959/5.945 with 10 mm (micron) taper Maximum run 0.03 0.03 out of valve face with respect to valve stem Valve seat dia 'C' gaugeø30.6 gaugeø27 Valve seat distance from valve face 'B' 2.1/1.9 2.1/1.9 Valve seat end distance from 2.7/2.3 3.2/2.8 valve face Maximum run out 0.03 0.03 of valve seat with respect to valve stem Distance of valve 0.7/0.95 0.7/0.95 head from cylinder head mating surface with crank case Fig. 185
RkJQdWJsaXNoZXIy MTIwNTUz