Vinegar will only fiz on deposits. Have an old Petter PH1 here that an Amish used for 30 years to power the milker vacuum pump. The Amish must have been using just an open barrel as a radiator. The cylinder head was plugged solid with only one small passage from the cylinder block to the coolant outlet on the head. Cylinder block was little better. It took several soakings. Three days at a time in Muratic acid to loosen the lime, calcium, mud, manure, dust, and livestock feed. And several sessions of poking into the water passages to chisel the deposits out. Used the sand blaster as well on some stubborn un-reachable corners. Near as can be told. The only cooling the engine had was the thermal inertia of the castings and oil splash with heat radiated off the sides of the crankcase.
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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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