Oh yes, it most likely is the sleeve o-rings. I have an Oliver 1750 and have had multiple issues with this. I've replaced them as often as 2 years after being redone. The last time a mechanic said that a machinist will cut down the surface on the block where the 0-rings on the sleeve meet the block and insert a new surface ring/liner so when the sleeve with new o-rings are pressed in, they will have a new surface to seal on. It has been 2-3 years now and is okay, no antifreeze in the oil pan. I'm a loyal Oliver fan and this multiple occurring problem really upset me and wanted to discard this tractor but, I guess loyal Oliver fans do not do that. If this interests you, give me an email and I'll connect you with the mechanic or machinist to explain what he actually did in detail.
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