Posted by Janicholson on April 22, 2014 at 20:25:01 from (74.60.94.18):
In Reply to: chewy posted by avant tractor on April 22, 2014 at 16:34:28:
The oily spots are a direct result of the engine operating cold. It is called Wet Stacking. As a Hydrocarbon fuel is oxidized, it forms water and carbon dioxide (and other trace chemicals). The water is burnt hydrogen. H2O. The CO2 is burnt Carbon. A diesel operates on 100$ air filling the cylinders. The amount of fuel is portioned out to make it do the work asked, and when putzing around at part power, the extra air is just passed on through the exhaust. The extra air reduces the operating temperature such that the water and soot condense in the exhaust system. This combo is what is spitting out the exhaust pipe. The tractor was designed to operate doing work at near capacity for hundreds of hours. So as it is, and as it is being used, it will keep doing it. Putting a sweeping right angle pipe on the exhaust will divert some of it to the side. Insulating the exhaust so it gets hot enough to reduce condensation would work when it was not worked hard, but would overheat the pipes if used for hard work. What to do? New diesels have pollution control catalytic converters, liquid injector, and computer controlled injection and almost eliminate the issue. Old gasoline and LPG tractors don"t do it because the exhaust gets hot and no extra air. Work it harder more often (not always possible) Buy a gas tractor for light work (expense of two) Trade it for a Gas or LPG tractor and be done with it. Live wit hit. Jim
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