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Farmall & IHC Tractors Discussion Forum
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Help!! Farmall M Carburetor Troubles

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Jerry Vander Ti

05-19-2007 15:40:41




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OK,so I got me a Farmall M and decided to give her a tune up. I adjusted the carburetor and now
she won't stay running. I've adjusted it so much I don't know where it started at, and it was running smoother before I messed with it. Any one know where I should start from?




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CNKS

05-19-2007 18:42:02




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 Re: Help!! Farmall M Carburetor Troubles in reply to Jerry Vander Till, 05-19-2007 15:40:41  
Initial settings are 3 turns out for the main jet and 1 turn for the idle mixture. With the engine warmed up and at wide open throttle, turn the main jet in until the engine stumbles, then out until smooth, plus maybe 1/4 turn more, you want the main jet as lean as possible. Retard throttle to low idle speed, adjust the idle speed with the idle stop screw fast enough so that the engine does not die. Adjust the idle mixture in or out until smooth. Unlike the main jet, turning in richens the idle mixture, out leans it. Advance the throttle to WOT rapidly, the engine should accelerate smoothly. If not repeat your adjustments. If it does not smooth out after a couple of tries, your carb needs to be removed, disassembled and soaked in a good carb cleaner and blown out with compressed air. Put a new Case-IH kit in it. Be sure your sediment bowl is clean and not restricted as Jim indicated. There is also an inline screen in the fitting that the fuel line screws into at the carb.

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Janicholson

05-19-2007 16:19:17




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 Re: Help!! Farmall M Carburetor Troubles in reply to Jerry Vander Till, 05-19-2007 15:40:41  
The "stay running" part has me thinking fuel supply. Tank. sediment bowl, strainer at the carb inlet. If fuel is getting to the carb it should stay running enough (maybe with a bit of choke) to adjust it. Rule 1 in mechanics is fix only one thing at a time multi fixes can be compounding the issue. Stay with us, we can get it operational. JimN



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CENTAUR

05-19-2007 16:08:06




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 Re: Help!! Farmall M Carburetor Troubles in reply to Jerry Vander Till, 05-19-2007 15:40:41  
You said you tuned it.What did you do other then adjust the carburetor if anything? CENTAUR



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