We had a lot of problems with the 66 series tractors doing just that. Throttle down after working hard and pushing out coolant. Running at proper level in radiator and they still did same thing. IH's field fix was to have us install a coolant expansion tank mounted on the precleaner baffle in front of radiator. That along with the radiator cap made for sealed systems took care of the problem. IH's factory fix was to rearrange the baffle in side the radiator to redirect the flow coming in the top of radiator. Usually, on the older tractors like 460 , through 806, reducing the coolant level to just over the cores would take care of the problem. Realize, that long neck on the radiator is a long way from the core so normal level is like 5 inch's below cap seat inside neck.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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