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As Dave said, I have a 2150 4x4 that I put a 5.9L Cummins engine into when my 478 Hurk gave up on me. I ran the 478 for about two years before it blew up and it was an OK engine, but it had it share of problems. It had a good amount of power, but it tended to get hot quickly when under heavy loads. The intake and exhaust manifolds were made togeather so it got the air hot going into the engine, that is why you dont see many of them with mufflers, and the side panels are screens, people are trying to get the heat away from them. The oil pressure shifted heavly on mine too, specially if you changed from going up hill to down, the pressure would drop suddenly and then return. I also hated the fuel usage on that engine, pulling hard it would eat 10 gal/hr with no problem. I think they fixed some of these problems in the later 478 models of White tractors with a larger radiator, better pumps, and some updates to the engine, but you will always fight a hot condition in an Oliver, because of the smaller radiator. These engines are also pricy to rebuild as I found out. It was going to cost about the same to rebuild the Hurk as it was to buy the Cummins. Hmmmmm, no brainer here.....
The 478 is a military engine and you can find them in the duece and 1/2 trucks. Not all the components are the same but you can switch yours over onto that engine. You can find the military engines pretty cheap, but they still have a lot of the same issues with heat and fuel usage. I opted for the 5.9L 6BTA Cummins engine. I have it running 210 HP on the PTO, it doesnt get hot at all, is a modern engine, and only drinks about 7 gal/hr under full load. The conversion did cost a little more then a rebuld, but it is a whole lot more tractor now. Easy conversion, lots of room in the tub to work, the bell housings are all ready to take the Cummins, easy and quick conversion, I would do it again. So you really have three options.... Sell the tractor as is with a busted engine and get $2,000 to maybe $3,000 out of it. Put a cheap military engine in it and you will get what you have now, but it will be origional and have about the same resale value. Or put a Cummins engine in it, have a bigger HP tractor that burns less fuel, spend a little more money on the tractor and have a little less resale. Depends on if you want it original, want to use it yourself or want to sell it. Good luck
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