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Hi Sorry to hear you are having problems finding a thermostat. I did some research on the need for a themostat in the Oliver engines. I thought I would copy the paragraph in the manual which explains the reasons for needing a themostat. Here goes: "The bypass type cooling system on the Oliver 77 and 88 series tractors is equipped with a themostat in the water outlet housing. This themostat bypasses the cooling liquid through the cylinder block water jacket until the engine nears operating temperature. When the engine approaches operating temperature, the thermostat opens sealing off the bypass and allowing the coolant to cirulate through the radiator. It is imperative that the thermostat be in the cooling system at all times. Removing it in warm weather will allow the cooling liquid to circulate through the water jacket only and overheating will occur." As I said before I assumed that the 60 engine uses the same concept as the 77 and 88, although I have never worked on one. With the thermostat removed is there a bypass hole below where the themostat goes? This would indicate it is the same. Maybe some one else knows if they are the same. I would think if it is the same you would have to make sure you have the correct themostat so that it closes the bypass as it opens the main flow channel. By the way the last two engines I overhauled where half full of rust and sludge when I pulled the sleeves, as mentioned by JS, so this can be a problem on older engines. It is tuff to get out without pulling the sleeves. With the head off you can try to poke a rod down to loosen the stuff, but I don't know if you can get it all this way. Good Luck and let us know how it works out.
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