ENGINE 30 Standard and Repair size of second main journal and thrust washer Dimensions in mm Size Width of Thickness of 2nd main journal thrust washer Standard 32.062/32.000 2.39/2.34 Larger – I 32.362/32.300 2.51/2.46 Larger – II 32.562/32:500 2.61/2.56 Gear mounting diameter on crank shaft ‘D’. Fig. 9. 50 00 + 0 018 + 0.002 mm Crank shaft gear inner bore diameter 50 00 + 0 025 mm - 0.000 Crank shaft flange diameter for mounting flywheel. ‘F’. Fig. 9. 130.00 + 0 028 mm 0.003 Width of crank pins ‘E’. Fig. 9. 38.13/37.93 mm Width of crankshaft journals other than 2nd journal. 32.200/32.000 mm Fillet radius on 2nd main journal 4 - 4.5 mm Fillet radius on crank pins & other journals. 3.5 - 4 mm Pretension of main bearing shell in parent bore. 0.074 - 0.134 mm. Radial clearance between crankshaft journals and main bearings. 0.04 - 0.08 mm Axial play of crankshaft 0.19 - 0.29 mm Hardness of crankshaft main journals and crank pins. 53 - 59 HRC Maximum permissible taper and ovality on crankshaft main journals & 0.01 mm crank pins Maximum permissible runout of crankshaft journals when supported at 0.1 mm first & 5th crankshaft journals. Permissible runout of flange for mounting flywheel. 0.02 mm Permissible lateral runout of crankshaft gear wheel mounting dia. 0.02 mm Maximum permissible imbalance of crankshaft with counterweights, 30 gm without flywheel, held on 2nd & 5th main bearings at 450 rpm. cm. Maximum permissible out of parallelism between crank pin and main 0.01 mm journal axis (on bearing axis)
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