Casting tech used on the heads wasn't good enough for the design. There was several head changes on some of the head numbers trying for better sevice. Some heads had 7 or more changes for the same head #. For some reason some heads lasted, so if you have one not cracked thats saw a lot of use there's a good chance its a better casting or took care of. Back in the day a local construction dealer would get new machines with cracked heads when unloading or before leaving the lot. Lot of good ways posted to help the heads last. Make sure there's gas and a good starting system to restart tractor if engine is killed when hot. Don't overload and keep the cooling system in top shape.
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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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