Posted by sustainat on December 14, 2014 at 12:39:11 from (173.186.61.194):
Ok. I'm coming back to this... tractor has been parked since early October.
I put a new thermostat in (tested old one, it was ok, but put new one in any way since I had it). Then I took the radiator off, and took it to have it boiled. They said the inside was very clean and it should be fine, outside was a little dirty. Put the radiator back on. Tractor still got into red zone after running for 15-20 minutes with no load.
Today I pressure tested the cooling system using a gauge that goes on the radiator in place of the rad cap. I pumped up to 17 psi, and it held there for more than 20 minutes. That seemed like a good sign regarding internal leaking.
But when I looked at oil level, it was high and the oil on the dipstick was milky. I took the dipstick with engine oil on it and held a flame to it - and heard crackling, which suggests to me that there is water in the oil.
So now I'm thinking that coolant is leaking when the engine gets hot, and that is why the radiator pressure test didn't show a leak.
That means there is a leaking head gasket, cracked/warped cylinder or head, or something of that nature - right? If so, I'm going to deem this over my head and find a pro. Before I do that - is there anything else that I should try? I guess I could change the oil and double-check that the oil level goes up - is it worth it? Maybe with today's warm temperatures after recent cold there was some internal condensation, as there was quite a bit of condensation on the exterior metal parts of the tractor. (It's been quite cold until the last couple of days - today is warm and humid, and there was condensation on many parts of the tractor.)
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