Nissan 12200-7Y00A CRANKSHAFT Assembly

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Remove all burrs from the crankshaft oil holes using a stone, file, or scraper. 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 to reveal hidden issues, typically handled by an automotive machine shop. Measure the diameter of the main and connecting rod journals with a micrometer, comparing the results to the specified standards, and measure at various points around each journal's circumference to determine if it is out-of-round, as well as at each end of the journal near the crank throws to check for tapering. If the journals are damaged, tapered, out-of-round, or worn beyond limits, have the crankshaft reground by an automotive machine shop, ensuring the use of the correct size bearing inserts if reconditioned. Check the oil seal journals at each end of the crankshaft for wear and damage; if a groove has formed or if there are nicks or scratches, 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, consider installing a new or different crankshaft. Finally, examine the main and rod bearing inserts.

It is assumed that the flywheel/driveplate, crankshaft pulley, timing belt (for SOHC engines), timing chain (for DOHC engines), sprockets, oil pan, oil pump, and piston/connecting rod assemblies have already been removed.

It's assumed that the engine block and crankshaft have been cleaned, inspected, and repaired or reconditioned.

They probably used a different manufacturer so they altered the p/n to reflect that.