It also can be red hot carbon that is expelled from the exhaust system when you work the tractor harder than usual. I don't know if all diesels coat the insides of the exhaust with carbon, but my 641D Ford sure does it, especially when I am just using it for light work. When I plow with a moldboard plow, I expect to get lots of sparks out the vertical exhaust. The sparks have actually started a couple of grass fires, so I am really careful about using that tractor in the very dry times of the year.
I have seen lots of Ford gas tractors with exhaust out the back, but I have never seen a diesel model with anything but vertical exhaust. My guess is that most people prefer to have the stinky diesel exhaust blowing away from where they are, at least some of the time, rather than having to smell it all the time since it is ending up right under the seat.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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