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My well worn, high hour 641D occasionally spits out a bit of red hot carbon from the exhaust. I have to be very careful with it during the dry days of August and September--it has started 2 small fires and one that got away from my Dad and burned about 20 acres years ago. I have not figured out how to get it to completely stop doing this, but it seems to work better now than it did for awhile about 10 years ago. I got the tractor from my Dad when he left the farm and it had not been used much for several years. He had some work done on the injector pump (although I don't know just what) and had the injectors rebuilt about 10 years before I got it. I think there was an injector hanging up or something, because when I would drive it fairly fast in high gear, drops of black oil would come out of the exhaust and get all over me. It seemed to pull and work just fine and idled fairly smooth, so I just avoided driving it at high speeds. Then I decided to do some plowing, just a large garden area, but an area that had never been plowed before and worked it very hard for a couple of hours. The engine got quite hot and I started getting fire out the exhaust pipe, which shot about 15 feet in the air. I quit plowing and drove the tractor a little ways to where I could reach it with a garden hose, in case the fire spread. I shut it down and luckily the fire soon quit. I let it cool down for an hour or two and then restarted it. It seemed to run normally, so I finished the small plowing job, with no more excitement. Since then I have not had trouble with either fire out the exhaust or the droplets of unburned oil out the exhaust at high speed. I have occasionally used some diesel fuel injector cleaner in the fuel tank, and maybe that has helped. But I think that much of my problems were caused by the engine being very "carboned up". Working it hard seemed to help the tractor performance, although I would have to admit that I worried that I had destroyed the engine when it started shooting the flames out the exhaust. I try to use the tractor very hard from time to time to prevent the problem, and it seems to be working. But I have not come up with a way to keep it from occasionally putting out the small bits of red hot carbon. Maybe a screen assembly would be a good idea, but I tend to use my gas tractor during the times of the year that I am concerned about that problem with the diesel. Good luck--I am always learning.....
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