And the caps are designed to allow the overflow coolant to flow into the collector bottle (where the radiator is completely full when servicing and temperature forces aren't forcing some of the coolant into the bottle) to return to the radiator when the volume is reduced therein due to a lower temperature.
One problem I always had over the years, before the days of the overflow bottle/full radiator concept was that I didn't realize/know that the tank on the radiator was designed to capture the contents of the radiator. For that to happen, full was just over the top of the core, not all the way up to the cap........since I have been aware of that, my vintage tractors (not newer ones with the bottle) no longer require me to keep adding coolant because I no longer think the tank has to be full and I no longer over fill them.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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