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Allis Chalmers Discussion Forum
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Carb leaks gas

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RalphL

01-23-2010 05:56:43




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I recently put a rebuild kit into my Model G carb. It started right up and ran good but after a while I noticed it leaking gas out of the throat that goes to the air cleaner. I took it back apart but could find no reason for the leak. I could use some expert advice on what I might be missing.




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jeffalex2

01-23-2010 16:35:45




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 Re: Carb leaks gas in reply to RalphL, 01-23-2010 05:56:43  
Dick is right...the rubber tip floats are garbage...if you have the old float needle, you can reuse it and adjust it. I'm not sure what the settings are for a G carb...



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jeffalex2

01-23-2010 16:35:41




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 Re: Carb leaks gas in reply to RalphL, 01-23-2010 05:56:43  
Dick is right...the rubber tip floats are garbage...if you have the old float needle, you can reuse it and adjust it. I'm not sure what the settings are for a G carb...



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Dick L

01-23-2010 07:56:55




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 Re: Carb leaks gas in reply to RalphL, 01-23-2010 05:56:43  
Probly have one of those stinking rubber/plastic tipped float needles that didn't get packed out right when they were run. I toss the stupid things if they don't seal properly and put in a solid brass or steel needle that I have saved from other rebuilds.
I have heard that you can spin them in the seat to get them to seal. I have not tried it but if you didn't save an old solid metal needle then it would be worth a try. I guess!

I rebuilt a carb for my Oliver 70 last fall. I drove it into the shop to repair the seat Monday and walked away from it for an hour and it looked like a gallon of gas had run out on th floor when I came back. That rubber tipped piece of crap will hit the trash can as soon as I get a chance to get to it.

If you get a good one they are fine but I sure don't like the odds at this point.

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steve(ill)

01-23-2010 07:00:50




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 Re: Carb leaks gas in reply to RalphL, 01-23-2010 05:56:43  
that means the bolw is overfilling. either the float level is wrong, the float i saturated and will not float, the float arms are bent slightly and the float is dragging on the sides of the bowl, or the shut off needle/ seat that the float raises is damaged and leaks thru



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