5S3903 Seal Oil Fits CaterpillarOne New Aftermarket Replacement Rear Crankshaft Oil Seal Fits Caterpillar (Fits CAT) D343 1693 Engine This aftermarket replacement rear crankshaft oil seal Fits Caterpillar equipment powered by the D343 and 1693 engine family. The rear crankshaft seal prevents oil from escaping the back of the engine block at the crankshaft exit point, keeping oil in and contaminants out. A worn or hardened rear crank seal is a common cause of rear main oil leaks on
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