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Datsun Roadster Engine Main Bearing - Sets OEM JAPAN
OEM main bearing set w/oversize center thrust flange surface
(5 MAIN BEARING).
OPENED ENGINE BEARING SETS ARE NOT RETURNABLE
OVERSIZE THRUST EXPLAINED BY YAMATO-SHOKAI NISSAN DISTRIBUTOR:
ALL aftermarket Nissan import bearings from 1990 and later are made with an oversize center thrust. The center thrust surface are dimensionally wider than the original bearings from the factory. The 20 year old and now 52 year old engines may have center thrust surfaces that are worn, grooved or rough orthey may be just fine. As manufacturers of bearings have knowledge of limited replacement new crank shafts, they make an oversized center thrust bearing that can then be fitted specifically to address the problem of crankshaft thrust surface wear.