74 486 PL ENGINE P Crank Shaft (Dimensions) : Stage Crank case main Crank shaft bearing bore main bearing diameter with journal bearing shell diameter mm mm Normal Grade I 60.046-60.085 60-0.010 (59.990-60.000) Grade II 60.046-60.085 60-0.020(59.980-59.990) Normal I Grade I 59.944-59.983 59.9-0.010(59.890-59.900) Grade II 59.944-59.983 59.9-0.020(59.880-59.890) Fig. 184 REPAIR ADJUSTMENT DATA Cylinder Block (Dimensions) - Fig. 184 Height of crank case (Dimension A & B) 304+0.1 mm Crankshaft axis from crankcase top surface 236.380/236.300 mm (above dimension with MB caps and front cover installed Maximum permissible Length wise 'C' 0.030 mm unevenness of crank Cross wise 'D' 0.015 mm case mating surface with cylinder head Piston & piston bore sizes : Stage Cylinder bore Piston stamped diameter diameter mm mm Grade A 86 ± 0.005 85.960 Grade B 86.010 ± 0.005 85.970 Grade C 86.020 ± 0.005 85.980 Piston to bore clearance 0.030/0.050mm (0.040 + 0.010mm) Piston rings : Max Lateral Butt Type Ring Clearance clearance of ring thickness in piston in cylinder groove bore mm mm mm 1st 1.5-0.010 0.080 0.2-0.4 Compression -0.030 2nd 1.5-0.010 0.060 0.5-0.7 Compression -0.030 3rd 3-0.010 0.060 0.2-0.5 Oil control -0.030 Piston cooling nozzle : l Nozzle opening pressure 2.7/3.2 bar l Jet height at pressure of 144 mm 2.9/3.5 bar. l Flow rate with SAE - 30 1.2 / 0.8 lpm. oil at 40oC & @ 4bar. B D A C -0.010 -0.010
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