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Injector pump on 1855

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Mike O

03-23-2002 06:34:28




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We had the injector pump rebuilt last summer on one of our older 1855's (without oil cooler). At the time, the shop pointed out the fact that the pump was set up for putting out a higher amount of fuel than was indicated in the specifications. He said it should not be a problem if the tractor was turbo charged. Since it seemed to run ok before the injector pump went bad, we figured to leave it at is. The problem is that the tractor now smokes alot. Should I get the pump reset to specs and can I do it or does that pump have to come off again. Is there anything else I am missing? I seem to recall an earlier post regarding timing issues. Thanks in advance.

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Merlin the Tractor Guy

03-23-2002 07:03:13




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 Re: Injector pump on 1855 in reply to Mike O, 03-23-2002 06:34:28  
Hello, Mike! Your pump is a Roosa-Master (Stanadyne) model DBGFC. There is a small, Allen head screw on the outside of the pump cover that can be used to make minor horsepower (ie fuel) adjustments. It is sometimes called a "smoke screw" by folks who work on these engines. By loosening the locknut and turning the screw IN, you will increase the amount of by-pass fuel, thus reducing the amount of fuel delivered to the injectors. If you back this screw out, it will increase fuel delivery. It was intended to be a fine adjustment (10% or less of gross horsepower), but some guys use it as an easy way to go beyond that, without disassembling the pump and re-setting the injection plungers (the proper way to do it). If your engine and turbo are in good condition, AND your air filter is not plugged, this may be an adjustment to consider. Also, check to see that your fuel return line is not plugged or kinked. Best wishes! Merlin

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