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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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