Topic: Re: farmall 140 zenith carb.
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IHSMOKE, if you haven't already remove the float and submerge it in a pail of hot water for several minutes. If you have a hole in the float it will fill with water and you'll need to fix it or get a new one. Also, I've read on this forum that the black tipped needle jets are much better at sealing than the red ones.
I experienced the exact same issue you're having when trying to rebuild the carb on my Farmall 460 gasser this past winter. I make no claims as to my mechanical prowess, but I have rebuilt several automobile carbs of various brands in my life. I have never experienced the problems I did with that infernal thing. It would be difficult to find a more simple working device, yet after following the directions for float adjustment that came with the rebuild kit and in the shop manual I could not get it to stop free-flowing gas. I had seen an add in Red Power Mag for Denny's Carb Shop, so finally in my frustration I bit the bullet and sent the son of Satan off to them for a pro rebuild. When I got the carb back I bolted it on and the old gal fired right up and ran great. It was a little pricey ($265.00), but to me it was well worth the money. Denny's boiled it out of course, re-milled the mating surfaces and removed and pressed in all those new little brass pieces. All things I couldn't do due to a lack of the proper tools/machinery. A pro carb rebuild will be the only way I go from now on when it comes to old tractors.
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