Strongly recommend that you contact this guy: He is has a wealth of Onan knowledge, used parts, new parts, complete engines etc. And fair prices. Once you price Onan parts you will appreciate the source at decent prices! Call and discuss your situation and see what is available. FWIW, it is very likely that you will need rings at a minimum. But, Onans don't typically wear the cylinders much at all.
No interest in his business, just have purchased parts in the past and seen his helpful comments on Case garden tractors on the net.
I would not change to another engine as the Onan is a solid performer, smooth running and lots of torque. Lot to be said for not having to make changes to fit another type. Exhaust, pump mount etc can get tricky in the 600 series chassis. If you want to keep the front belt PTO it is even trickier.
I have a project 644 that has been a project for years. Maybe this is the year it gets completed
Oh, before working it hard, open the differential and check the 4 bolts that hold the diff case together. Better yet, order a set and replace them as they are one of the few weak spots in the Case garden tractor line.
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