The correct engine for it would be a Hercules IXB if I remember right. Been a few years since I had one of the OC-3s I do still have a HG42 which is very close to the OC-3 but my HG has an Oliver 60 engine in it
 
Hercules IXB3. If you find an engine, check the dipstick. An original dipstick will have IXB3 stamped on it.
 
OC3 came with either an IXB3 Hercules gas engine or a ZD-129 Continental diesel.

IXB3s are hard to find. Were used in a few wheel tractors beside the Oliver crawler. There are newer IXB5s around for sale that will fit.
 
Fullmer: Check with Landis Zimmerman at olivercletrac.com; he'll know what else might drop or fit in that'd be easier to find parts for. Good luck.
 

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