Have you overfilled the radiator? Since these older machines do not have an external overflow tank, they were designed to have expansion space above the radiator core. So that means you fill them about 1/4" above the core and the rest of the tank valume is for expansion. What maybe happening in your case is that the radiator is overfilled and the when the coolant expands due to a slight change in tempertureit it has no room to expand so the pressure increases and the cap relieves that pressure by spilling fluid. The only other way of increasing the cooling system pressures is by having a leaking head gasket. You don't have any of the common signs of that but a compression check can give an indication. If I were you I would try reducing the coolant fill and see if that corrects the problem.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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