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Allis Chalmers Discussion Forum
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Allis 170

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Nzak

11-16-2019 17:57:04




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I have 2 tractors both 170. One I'm having trouble with gas running out of the carb.
I have rebuilt it three times with three kits still floods. So I took the carb off the good running one and installed it on the one that floods. Or I'm thinking something else is wrong because that one flooded two. So removed it and installed it back to the running one everything good.
Anyone know what else to look for can't be the carb.

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Nzak

12-01-2019 16:48:37




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
Quoting Removed, click Modern View to see

Okay found the PROBLEM......

Loose connection from carburetor to fuel bowl.

Tied everything real tied and no fuel leaking out of carburetor.



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DrAllis

11-18-2019 09:23:03




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
Very few people have a correct tool for tightening the brass seat into the carbs upper body. A normal sized screwdriver doesn't work. I have an old putty knife that I reshaped and sharpened to fit the seat notches good and be able to use a pair of pliers to make sure it is tight. I also think you have a dirty fuel tank that needs to be cleaned out and them graft in a paper in-line fuel filter from a car to catch remaining debris and keep out of carb. Shutting off the valve at the sediment bowl when not using the tractor will prevent gas running thru the carb, although that valve isn't easy to reach on an old One-Seventy.

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Nzak

11-18-2019 12:14:40




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 Re: Allis 170 in reply to DrAllis, 11-18-2019 09:23:03  
I used a hammer claw to turn it tight



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Aaron SEIA

11-18-2019 08:24:04




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
No. The only way gas can run out of a carb when sitting (assuming the float doesn't sink and is adjusted properly) is if the needle isn't seating, or the housing is cracked around the seat threads.

AaronSEIA



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Nzak

11-18-2019 07:13:25




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
If there is a leak in the fuel line to carb. Would this cause the gas to keep flowing into the carb. Because of the air pressure



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rrlund

11-17-2019 07:01:47




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
I went with an electric shutoff on three of my gas tractors. I hooked them to the coil so as soon as I turn on the switch,they open up and let the gas flow. Shut them off and the gas stops. Works great.




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Nzak

11-17-2019 09:31:05




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 Re: Allis 170 in reply to rrlund, 11-17-2019 07:01:47  
So where can I get the electric shut off



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rrlund

11-17-2019 09:59:42




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 Re: Allis 170 in reply to Nzak, 11-17-2019 09:31:05  
Amazon. Just search it on there. I think the one in the picture is actually from a nitrous kit,but I got the other two off Amazon. An auto parts store should have a whole catalog full of them too.



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mptaszynski

11-16-2019 18:37:41




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
Could it be that you have some dirt or fine debri ( rust) in one tractor fuel tank that you don't have in the other? Does the leaking tractor have more fuel in the tank ( more weight and more pressure on needle and float)?



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Nzak

11-16-2019 19:08:31




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 Re: Allis 170 in reply to mptaszynski, 11-16-2019 18:37:41  
Thr One that run the flow of gas is slower I think there is debre in tank.



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Dieseltech

11-16-2019 18:07:50




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 Re: Allis 170 in reply to Nzak, 11-16-2019 17:57:04  
If by chance it's a Marvel Schebler carb, I have best luck setting the float to body gap to 5/16 inch instead of the 1/4 inch specs call for with today's gas. Have also seen the float brass valve seat gasket seep gas past it unless it's really tight.



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Nzak

11-16-2019 19:12:27




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 Re: Allis 170 in reply to Dieseltech, 11-16-2019 18:07:50  
I can blow in the carb fuel inlet no air passes with carb upside down. And right side up air passes



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Nzak

11-16-2019 19:05:37




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 Re: Allis 170 in reply to Dieseltech, 11-16-2019 18:07:50  
Zenith carb 13294



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