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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