ENGINE 99 Fig. 10 Fig. 9 8 Select thrust washers of correct size to maintain permissible crankshaft axial play. 9 Re-chamfer oil holes onmain journals and crankpins to avoid scoring of newbearing shells. 10 Finish journals andpins by lapping themwith320grit lappingclothof suitablewidth.Mount counterweights and tighten mounting bolts to specified torque. Ensure that counterweights are assembled in their original respective positions. 11 Checkdimensionsofmain journals, crankpinsandalso runout ofmain journals. 12 Thoroughlycleanoil holes incrankshaftwithkerosene jet andwire brush. 13 Recheck for cracks andbalance crankshaft after every re-grinding. 14 Apply grease to all machined surfaces if crankshaft is to be stored. Crankshaft must always be stored in vertical position. 15 Fitmainbearing shellsmaking sure that locating lugs are properly seated in notches of parent bore of crankcase andmain bearing cap. 16 Mountmainbearing capswith shells on crankcase in position and tighten mounting bolts to specified torque. 17 Measure main bearing bores using internal measuring instrument. Fig. 9. NOTE If parent bore diameter is maintained within specification, proper bearing dimension is automatically achieved. However, it must be ensured by physically checking bearing size. 18 Loosen main bearing cap bolt on tappet side and check bearing pretension with feeler gauge. Fig. 10. 19 Remove main bearing caps again. NOTE : Main bearing shells, no matter which repair stage are precision finished and must on no account be bored or scraped.
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