The M was John Deere"s first model of the Dubuque line and along with the rest of the letter series until late 1951(?) used the thermo-siphon cooling system with out a water pump. the "M" series of tractors always had a tendency to run some what hot. The temp gauge is in the top water pipe where the water is the hottest. A loose fan belt, plugged radiator fins or unmixed coolant will all contribute to this system running hot since it depends on the principle of hot water rising and cooler water sinking to the bottom. This is aided by a copper finned radiator core that transfers heat rapidly and if all is working right these tractors still ran on the upper end of the temp scale just before hot.
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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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