Posted by fixerupper on December 02, 2007 at 17:44:48 from (216.51.182.132):
In Reply to: Get Me The Gun! posted by Allan In NE on December 02, 2007 at 11:43:37:
Allan, Mike M. was mentioning the carb on a 4020. Well, my old 105 JD combine has a 4020 gas engine and I don't remember if it has the MS carb or the Zenith, but it would idle rich no matter what I did to it, and then a JD mechanic told me it was probably sucking fuel from around the internal accelerator pump vacuum piston. There was no fix other than replace the carb, since the piston is a machine fit with no seals, so I plugged the vacuum hole that goes to that piston and it idled like a charm for ever after. The downfall was that I had to open the throttle slowly to get it to rev up. Obviously this will only work for a combine because it isn't being throttled up and down like a tractor. This carb (Marvel Schebler maybe?) was on the 1850 oliver gas also, but I don't know if IH used it or not. Jim
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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