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Very true !!!!

There are several models of "civilian" ONAN generator engines that will have parts interchange with our MEPS. Call your local supplier of ONAN parts. Of course you can always put a "want add" here for a good used engine for parts. Forgot to mention. Glad you found the culprit !

The oil pump shaft and gears are hardened, so I expect you will find some foreign piece of garbage in that pump once you tear it down. I have never seen any vehicle or stationary engines oil pump break without it being caused by some external force. Worn out, yes. Broken up, no.