ARIA

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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