Nissan 12201-1KC0A CRANKSHAFT Assembly

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To verify crankshaft endfloat, place the crankshaft in the cylinder block or crankcase but should be able to move back and forth. Ordinarily, a dial gauge touching the end of the crankshaft will be helpful, push it fully in one direction and zero the dial gauge then push the dial gauge fully in the opposite direction to measure the end float as this will determine if new thrust washers are required. Feelers can be used if a dial gauge is not available and it can measure the clearance between the No 4 crankpin web and No 3 main bearing thrustwasher, having pushed the crankshaft towards the flywheel end. Scrape clean with paraffin or choose an appropriate solvent while doing away with the crankshaft's use of compressed air and making certain that the oil holes are clear. Check the main and big-end bearing journals for wears, scoring, pitting and crack. Bearing wear on the big-end will result in metallic knocking and loss of oil pressure while in the main bearing, it results in severe vibration and rumble increasing with the increase in speeds and oil pressure loss. One should also examine the bearing journal for roughness, as any kind of roughness would mean that the journal needs to be reground or replaced. Check for wear on the flat contact surfaces of the oil seal, Deep scraper may need the service of a specialist to fix or warrant a replacement of the crankshaft. Crankshaft measurement should be accurate and this is a task that can only be done by the automotive engineering workshop, hence the appropriate journal bearings should be sourced from the same workshop in case of regrinding. After regrinding, examine case for burrs around the oil holes: if any, they should be scraped off and the entire area cleaned. This may be true only on desks stocks; if the crankshaft is worn out beyond the limit, and undersize bearings are not available, the crankshaft will have to be replaced; check with a Nissan dealer or an engine genius for the parts sizes.

Clean the backs of the bearing shells and the bearing locations in both the cylinder block and the main bearing caps.

Carefully lift out the crankshaft, ensuring the upper main bearing shells remain in place, then recover the upper bearing shells from the cylinder block and tape them to their respective caps.