HEXA

97 / 1906

ENGINE
61
Stage Cylinder block case main bearing
bore diameter with bearing shell (mm)
Crankshaft main bearing journal
diameter (mm)
Standard 60.026, 60.065 60.0 0, -0.02
Standard 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)
4th main bearing thrust washer
thickness (mm)
Standard 2.50, 2.55 2.52
Standard 1 5.55, 2.60 2.57
Repair 1 2.60, 2.65 2.62
Repair 2 2.65, 2.70 2.67
Repair 3 2.70, 2.75 2.72
Maintenance Limit
Axial play of crank shaft 0.070 – 0.252 mm
Fillet radius of main bearing journals 2.25 – 2.75 mm
Fillet radius of crank pin journals 2.5 – 3 mm
Width of 1st, 2nd, 3rd, and 5th main bearing journals 26+0.2 mm
Width of crank pin journals 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 and 4th, 5th main bearing journals 0.02 mm
Maximum permissible out of parallelism between crank pin and main bearing 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 diameter in crank case 63.72 H6
Maximum permissible concentricity of main bearing parent bore 0.03 mm
Maximum permissible cylindricity of main bearing parent bore 0.01 mm
Crank shaft journal to main bearing clearance 0.026 – 0.085 mm