Posted by DanMD on August 09, 2012 at 09:53:42 from (199.61.25.254):
Ever since I inherited this tractor a year ago, it has run away for a second or two when I switch it to diesel. It only seems to do it the first start of the day or at least after being shut off for several hours. Since I've owned the tractor, I've overhauled the motor and the fuel injection system - no change. When I switch it over, I pull the compression lever and don't have to start the inj. pump until the motor starts to spin down after this initial runaway. After this, it runs good.
What I think is happening is that the motor sucks the carb dry and is dieseling on the gasoline from the carb bowl. I know that the needle valve is working, but it may not being closing fast enough. The gas tank doesn't go down at all while running on diesel either, just the carb is emptied out. With this information, I went through all the settings on the shift over linkage and it was way off. Do you think that this may have been my whole problem or is something else going on? With the compression valves closed in the head, is there another way for the gas from the bowl to be sucked into the motor? Is it possible the gas could be sucked out past the choke valve? I haven't fired it up yet since making these adjustments and I thought maybe I am forgetting to check something before I fire it up again. It scares me enough that something is going to break that I hate even starting it. Is there such a thing that I need to give it some diesel injection before I switch it over to dilute the gas somewhat? As far as the rebuild, everything is new in the head and block, so I don't think I have an issue in the motor. It acts the same today as it did before the rebuild and the injection work.
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