Mercury F1AZ-6303-ARM Crankshaft Assembly

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Remove burrs from crankshaft oil holes with stone/file/scraper. Chamfer oil holes to prevent bearing damage. Clean crankshaft with solvent and compressed air. Use brush to clean oil holes and flush with solvent. Rub penny on journals to check for copper embedding. Inspect for wear, scoring, pits, cracks. Magnaflux for hidden cracks. Measure journal diameter with micrometer for taper/out-of-round. Regrind if damaged/worn. Check oil seal journals for wear/damage. Repair or replace if necessary. Examine bearing inserts.

Inspect the endplay using a dial indicator or feeler gauges before taking out the crankshaft. If the endplay is more than the limit, then check for wear on crankshaft thrust surfaces. If necessary, label and number main bearing caps. On OHV engines begin from the center and loosen main bearing cap bolts gradually. In order to take off the crankshaft in OHC engines, follow this exact process. Replace main bearing cap bolts and lift out the crankshaft gently. Put back the caps in their original positions on the engine block and finger tighten their bolts.

After verifying the main bearing oil clearance, a thin, uniform layer of moly-base grease or engine assembly lube is applied to the bearing surfaces of the crankshaft.