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Tractor Talk Discussion Forum

farmall H problem

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Chas

06-22-2004 18:37:27




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I have a H that will only run with the carburator fully choked. The carb was rebuilt and the firing order is ok. I notice a lot of gas dripping out of the filler hole on the bottom. Also I have noticed that when the tractor is running fully choked, there is a vacuum through the filler hole into the carburator. I have a M that is running properly and I don't feel a vacumm through it's filler hole and it does not drip excess gas through the bottom. Please Help!!! Thank You.

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Jed

06-23-2004 06:07:22




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 Re: farmall H problem in reply to Chas, 06-22-2004 18:37:27  
Chas, I forgot to add that the vaccum is normal.
It's an updarft system. When you choke it that is max vaccum. With your choke on full you are demanding an increased flow of gasoline. First
is that the float needle valve is hanging open and second is that one of your jets is partially plugged. Good luck.



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Jed

06-23-2004 06:01:29




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 Re: farmall H problem in reply to Chas, 06-22-2004 18:37:27  
Chas, I recently have been driven near nuts with Farmall H gasoline problems. I flushed the tank because it had bad gasoline, although most people say gasoline doesn't go bad. I replaced the tank and started it. It only ran on the choke. I next rebuilt the carb. It ran okay for about 10 minutes and then it would only run with the choke on and it had no power. Upon unhooking the gasoline line I saw that I had no gasoline coming from the tank. I removed the bowl and drained out a lot of rust. When I started it the carb was fouled again. I rebuilt the carb and started it again last nite. Well now I have no gasoline flow from the tank again. I am going to get someone to steam clean the tank and seal it.
Also the other problem I noticed is that the bad gasoline even dilluted with new gasoline makes the tractor smoke. It isn't oil or water smoke, but a grayish type. Additionally there is a lot of gum in the carb. What a mess.

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bstrucker

06-22-2004 19:32:37




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 Re: farmall H problem in reply to Chas, 06-22-2004 18:37:27  
I'm not sure what you mean by a filler hole.I'm thinking the reason that you are feeling a vacumm,is that with the choke closed that is the only place you are getting air into the carb.Check inside the carb again,I'm thinking that you missed something.It doesn't take but only a tiny piece of dirt or rust to do what yours is doing.



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Ron

06-23-2004 04:11:21




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 Re: Re: farmall H problem in reply to bstrucker, 06-22-2004 19:32:37  
The carb body drain which is a wire mesh screen is sometimes called a "strainer" or "filter". I think he meant "filter" and not "filler".

Your reasoning for why there is a slight vacuum present there with the choke on is right on the money.



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Ron

06-22-2004 18:57:17




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 Re: farmall H problem in reply to Chas, 06-22-2004 18:37:27  
Typically that means you have a damaged float needle/seat or dirt trapped between them.



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Allan in NE

06-22-2004 18:41:28




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 Re: farmall H problem in reply to Chas, 06-22-2004 18:37:27  
Chas,

You gotta go back into that carb. 'Taint right. It is starving for fuel, hence the choking needed.

Allan



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Allan in NE

06-22-2004 18:48:51




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 Re: Re: farmall H problem in reply to Allan in NE, 06-22-2004 18:41:28  
Or,

You have one heck of a vacumn leak (which just might be the case if your getting a lot of gasoline overflow).

Allan



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Mark - IN.

06-22-2004 19:10:51




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 Re: Re: Re: farmall H problem in reply to Allan in NE, 06-22-2004 18:48:51  
Allen sure does sound right, sure sounds like a vacumn leak, and by choking it that it's actually creating enough air turbulance at the base of the carburator to somewhat atomize the gas. Not that it may matter, how did it run before the carb was rebuilt? Better, worse, was doing same thing? Vacumn leak fits the symptom, but have no clue what your manifold pressure should be.



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