1. Use a scraper, file, or abrasive stone to remove any burrs from the crankshaft oil holes.
2. Wash the crankshaft with solvent and dry with compressed air (if available). Do not forget to clean the oil passages with a stiff brush and flush them with solvent.
3. Check up necks of radical bearings and bearings of rods on presence of uneven wear, furrows, dents and cracks.
4. Run a copper coin over each neck several times. If traces of copper remain on the neck, then it is too uneven and should be sanded.
5. Check the rest of the crankshaft for cracks or other damage. If necessary, entrust the inspection of the crankshaft to a mechanical workshop.
6. Using a micrometer, measure the diameters of the journals of the main and connecting rod bearings and compare the measurement results with the requirements Tables of sizes and adjustment data at the end of the Guide. By measuring at several points, you can determine what ovality the necks have. To determine the taper value of the journals, measure the diameters of the journals at their edges, near the crank cheeks.
7. If the crankshaft journals are damaged, tapered, oval, or worn beyond the limits specified in Table of dimensions and adjustment data at the end of the manual, send the crankshaft to the machine shop for grinding. Make sure the correct size bearings are used after grinding the crankshaft.
8. Check the ends of the crankshaft sealed with oil seals for damage and wear. If the seal has developed a groove in the stud, or if it is nicked or scratched, the new seal may leak after reassembly of the engine. In some cases, the machine shop can repair the stud by pressing a thin bushing onto it. If repair is not possible, then a different or new crankshaft should be installed.
9. Check the condition of the main and connecting rod bearing shells (see Section Checking the condition of the main and connecting rod bearings).