ENGINE 72 CRANK SHAFT Stage Crank case main bearing bore dia. with bearing shell (mm) Crank case main bearing journal dia.(mm) Normal 60.026, 60.065 60. 0 0, -0.02 Normal 1 59.926, 59.965 59.90 0,-0.02 Repair 1 59.776, 59.815 59.75 0.0, -0.02 Repair 2 59.526, 59.565 59.5 0.0, -0.02 Stage Width of 4th main bearing journal mm Standard 2.50, 2.55 Standard 1 2.55, 2.6 Repair 1 2.6, 2.65 Repair 2 2.65, 2.70 Repair 3 2.70, 2.75 Thickness of 4th bearing thrust washers 2.52 mm 2.57 mm 2.62 mm 2.67 mm 2.72 mm Axial play of crankshaft 0.070- 0.252 mm Fillet radius of main bearing journals 2.25-2.75mm Fillet radius of crank pin journal 2.5-3 mm Width 1st, 2nd, 3rd, and 5th main bearing journals 26+0.2 Width crank pin journal 25.5 + 0.03 mm Maximum permissible circularity 0.008 mm Ovality of main bearing journal 0.008 mm Maximum permissible ovality of crank pin 0.005 mm Maximum permissible run out of 2nd,3rd and4th 5th main bearing journals 0.02 mm Maximum permissible out of parallelism between crank pin and main journal axis 0.01 mm Pre tension of main bearing shells 0.060-0.090 mm Hardness of crank shaft main bearing and crank pin journals 55+5 HRC Main bearing parent bore dia. In crankcase 63.72 H 6 Maximum permissible concentricity of main bearing parent bore 0.03 mm Maximum permissible cylindricity of main bearing parent bore 0.01 mm Crankshaft journal to main bearing clearance 0.026-0.085 mm
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