I am looking at buying a 92 Pathfinder. It has a newer engine that was put in with 45k and now has 60k. The engine was from an auto and when the auto converter was removed there was some some damage to the crank. The Rear main seal has been leaking. I am just wondering If this will be fixable without pulling the engine and replacing the the crankshaft? The seal has been replaced and still leaks. Could this be as easy as a bad PCV valve?

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