A-1KS129-AI Seal, Rear CrankshaftOne New Aftermarket Replacement Rear Crankshaft Seal for Oliver and Minneapolis Moline Tractors This rear crankshaft seal (also known as the rear main seal) fits at the back of the engine block between the engine and flywheel, sealing the crankshaft to prevent oil leaks. It is a spring loaded cork seal designed as a direct replacement for Oliver and Minneapolis Moline (MM) tractor engines. Specifications Type: Spring Loaded Cork Seal Steel Retainer
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