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Allis Chalmers Discussion Forum

Zenith carb issues

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Logan fees

08-24-2019 07:06:39

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I have a 1937 Allis Chalmers WC with a zenith carb. I am having issues with the carb flooding out my tractor and not allowing it to start every time. When I try cranking it I can smell alot of fuel coming from exhuast and may have a little fuel run from the carb on occasion. That being said there has been a couple times that I did get the tractor going and after a bit of adjustment it runs fine and will run fine and run for as long as I will let it. But if I shut it off I'm back to flooding. Ive taken the carb apart a few times to check the float and Clean it. I am not a good carburetor guy but everything seems to be fine. I have also pulled all plugs and I do have fire to all cylinders. I'm not sure what I'm missing or doing wrong and some help would be appreciated. Thanks

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08-26-2019 18:11:00

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 Re: Zenith carb issues in reply to Logan fees, 08-24-2019 07:06:39  
Mine did the same thing. I put the old style needle valve(solid with no rubber tip) back in and the problem was solved. Might help.

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Ted in NE-OH

08-24-2019 10:09:34

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 Re: Zenith carb issues in reply to Logan fees, 08-24-2019 07:06:39  
You could also turn the gas off as soon as you stop the tractor,leaving some gas in the carb. Then when you start the tractor leave the gas off until the tractor starts and then quickly open the gas.

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08-24-2019 07:24:38

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 Re: Zenith carb issues in reply to Logan fees, 08-24-2019 07:06:39  
Have you replaced the float and the needle/seat? The float sometimes get a dimple wore where it contacts the needle. This can cause the needle to set crooked causing leakage. The seat can also get grooves wore in it from the movement of the needle causing the same problem.

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