Clean the crankshaft with solvent and dry it with compressed air if available. Check the main and connecting rod bearing journals for uneven wear, scoring, pits, and cracks. Clean the oil holes with a stiff brush and flush them with solvent, using a stiff plastic bristle brush for the oil passages in the crankshaft. Inspect the rest of the crankshaft for cracks and other damage, ensuring it is 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, comparing the results to the specified limits, and check for taper and out-of-round conditions by measuring at several points around each journal's circumference, including each end near the crank throws. If the journals are damaged, tapered, out-of-round, or worn beyond the specified limits, have the crankshaft reground by an automotive machine shop, ensuring the correct size bearing inserts are used if reconditioned. Inspect the oil seal journals at each end of the crankshaft for wear and damage; if grooves, nicks, or scratches are present, the new seal may leak upon reassembly. An automotive machine shop may repair the journal by pressing on a thin sleeve, but if repair isn't feasible, a new or different crankshaft should be installed. Finally, examine the main and rod bearing inserts.