Couple of things here. One I did and other I saw the damage. Guy brought in a Super M farmall gasoline tractor to shop. Hadn't run for a long time so I left it in the lot, went out and drained the gasoline out of tank. Some gas got into clutch housing. Later I put in fresh gas after cleaning carb etc, etc, and hit the starter. Boom, the gasoline ignited from spark of brush's in starter. Scared heck out of me and I never did find the plugs that were in the clutch housing plugging the holes where a belly pump would be if it had one.
Other time was hole in the side of the oil pan on a 5 ton Army vehicle. As all the components like distributor had to be water proof for fording they were all vented. Vent lines hooked together from crankcase, distributor etc to one common connector. Anyway, the spark of the points set off gasoline fumes in crankcase and blew the cast oil pan a nice big hole. Don't recall for sure but I think a check valve was supposed to prevent that.
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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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