Re: Turning up a Roosa-Master pump

Posted by jdemaris on January 28, 2005 at 05:34:45 from (209.23.28.25):

In Reply to: Re: Turning up a Roosa-Master pump posted by Bob/Ont on January 27, 2005 at 20:48:37:

What you are calling a plate is what I am calling a leaf spring. It IS a spring. The spring has a curve in it, i.e. an arc with an allen screw going through the center of it. The distance between the ends of the spring determine the fuel delivery because it stops the end travel of the fuel plungers. The more you tighten the allen screw, the flatter the springs becomes and thus longer - and thus allowing more travel of the fuel plungers. Once the spring is completely flattened, it CANNOT get any longer, so that's all you will get by turning the screw. As aforementioned, from the factory, there are usually shims behind the spring that limit the amount you can flatten it. When setting up the pump, if you have it apart, Roosamaster provides specifications given in decimal inches for every particular application. This distance provides the proper fuel delivery. So, you energize the fuel plungers so they are forced all the way out and put a micrometer on them and thus get your initial fuel delivery setting. Later, when the pump is assembled, and you have opportunity to put it on a test stand, the fuel delivery can be verified and fine-tuned if necessary. If you don't have a test stand, it pretty easy to ascertain proper operation once the tractor is run and tested - for proper starting, horsepower output, visible smoke, etc.

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