MarkB_MI said: (quoted from post at 13:02:43 01/03/10) Borrow a pressure tester. Mount it on the radiator and start the engine up. If the pressure gage takes off immediately, you have a bad head gasket. If it runs for a minute and the pressure rises only slightly, the head gasket is good and you can look elsewhere.
If you put the pressure tester on the radiator after running the engine enough to stabilize the temperature, any rise in pressure is a good indication of combustion gasses entering the cooling system.
The fact that the heat comes and goes with the cooling system full is almost always an indication of a combustion leak into the cooling system.
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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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