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Hi - I have an excavator that I am working on. It is a Mitsubishi MM55SR (similar to CAT 305) that originally had a Mitsubishi K4N. Previous owners blew the engine, had a mechanic working on it, parts got misplaced/lost, and basically they didn't have the original engine. Since the K4N is such an old engine and hard to find, I am looking for suggestions on a different motor to swap in. I had been looking at the Mitsubishi S4Q2 or S4L2 but I talked with someone and they said they thought maybe an S4S engine might be better since its a previous version and they said its more mechanical. Any suggestions would be greatly appreciated.

Scott
 
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