Remove all burrs from the crankshaft oil holes with a stone, file, or scraper to ensure sharp edges do not gouge or scratch the new bearings. 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, and inspect the rest of the crankshaft for cracks and other damage, which should be revealed through magnafluxing at an automotive machine shop. Measure the diameter of the main and connecting rod journals using a micrometer, comparing results at several points to detect taper and out-of-round conditions, including measurements at each end of the journal near the crank throws. If the journals are damaged, tapered, out-of-round, or worn beyond specified limits, replacement of the crankshaft is necessary as it cannot be reground. Inspect the oil seal journals at each end of the crankshaft for wear and damage; if grooves, nicks, or scratches are present, new seals may leak upon reassembly, and an automotive machine shop may be able to repair the journal with a thin sleeve, otherwise a new or different crankshaft should be installed. Place the crankshaft in V-blocks or a lathe, setting up a dial indicator to contact each main bearing journal in turn, rotating the crankshaft through two complete revolutions at each position and comparing the readings to the runout limit, replacing the crankshaft if it exceeds the limit. Finally, examine the main and rod bearing inserts.