Remove all burrs from the crankshaft oil holes using a stone, file, or scraper to ensure the oil holes are chamfered, preventing sharp edges from gouging or scratching the new bearings. 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, and inspect the rest of the crankshaft for cracks and other damage, which should be magnafluxed by an automotive machine shop to reveal hidden issues. 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, and an automotive machine shop may be able to repair the journal with a thin sleeve, or a new or different crankshaft may need to be installed if repair isn't feasible. Finally, examine the main and rod bearing inserts.
