Remove all burrs from the crankshaft oil holes using a stone, file, or scraper. Clean the crankshaft with solvent and dry it with compressed air if available, ensuring to clean the oil holes with a stiff brush and flush them with solvent. Check the main and connecting rod bearing journals for uneven wear, scoring, pits, and cracks. Rub a penny across each journal several times; if a journal picks up copper from the penny, it is too rough and must be reground. Inspect the rest of the crankshaft for cracks and other damage, and have it magnafluxed to reveal hidden cracks, which an automotive machine shop can handle. Measure the diameter of the main and connecting rod journals with a micrometer and compare the results to the specifications, measuring at various points around each journal's circumference to determine if it is out-of-round, and take measurements at each end of the journal near the crank throws to check for taper. If the crankshaft journals are damaged, tapered, out-of-round, or worn beyond the specified limits, have the crankshaft re-ground by an automotive machine shop, ensuring to use the correct size bearing inserts if reconditioned. Check the oil seal journals at each end of the crankshaft for wear and damage; if the seal has worn a groove in the journal or if it is nicked or scratched, the new seal may leak upon reassembly. An automotive machine shop may be able to repair the journal by pressing on a thin sleeve, but if repair is not feasible, a new or different crankshaft should be installed. Finally, examine the main and rod bearing inserts.