The H is positive ground. The small tank originally was for gasoline to start the tractor on and then you switched to the large tank which used kerosene. Most of these tractors had the line from the small tank disconnected years ago and it just burns gasoline from the big tank. If it hasn't been monkeyed with there should be a heat shield over the manifold,a baffle in the exhaust and shutters on the rad. You started on gasoline, switched over to kerosene , closed the shutters until you heat guage was in the "Run"...the heat shield and shutters made the tractor run hotter and thus more efficient with kerosene. My Dad ran an M on kerosene during WW2. He said the tractor set up properly for kerosene would pull like a trooper and seemed to have slightly more power than running on gasoline. You had to know what you were doing when you set up for burning distilates. Those tractors were designed for distilates rather than gasoline.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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