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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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