[AT] Super A Carb Leak

[charlie hill]

Ben,  is there a small gasket (possibly paper) that goes under the flange of 
the valve seat when it screws in?  If so make sure that is intact and seated 
well.  If you use pipe sealant make sure it is gasoline resistant type and 
non hardening or you'll be sorry you used it.    If the needle isn't mating 
in the seat your options are to replace the valve and the seat or to take 
some lapping compound, put a little dab in the seat and on the end of the 
valve and spin the valve round and round in the seat for a while with 
moderate pressure.  That will grind the valve and the seat to match each 
other.  Clean it up good and give it another try.   I've never tried lapping 
a needle valve but it should work.  You'll have to figure out some method of 
spinning the valve slowly.
Since it doesn't leak until you run the tractor it could possibly be that 
there is a hair line crack in the carb housing that is opening up with heat. 
I don't know.  Just a thought.

Charlie

--------------------------------------------------
From: "Ben Wagner" <supera1948 at gmail.com>
Sent: Wednesday, July 07, 2010 6:04 PM
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Cc: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Subject: Re: [AT] Super A Carb Leak

> On 7/7/2010 4:25 PM, charlie hill wrote:
>> Ben, how can you tell the float isn't sticking with the carburetor put
>> together and mounted on the tractor?  Unless there is some sort of crack 
>> in
>> the carb housing or the gasket is leaking there are only two 
>> possibilities,
>> float is not floating up properly or needle valve and seat are not 
>> properly
>> mating.   That's it, got to be one of the two.
>>
>> Charlie
>>
>> --------------------------------------------------
>> From: "Ben Wagner"<supera1948 at gmail.com>
>> Sent: Wednesday, July 07, 2010 3:18 PM
>> To: "Antique tractor email discussion 
>> group"<at at lists.antique-tractor.com>
>> Cc: "Farmall/IHC mailing list"<farmall at lists.antique-tractor.com>
>> Subject: Re: [AT] Super A Carb Leak
>>
>>> It leaks after it is running.  During, and before, it is fine.
>>>
>>> As for the float/ bowl level... I lowered it some, but the leak
>>> persists.  I have checked, and the float isn't sticking.
>>>
>>> Thanks,
>>> Ben Wagner
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>>>
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> I'll try what someone suggested and put some pipe sealant on the seat.
> That would eliminate any leak from around the seat, and that would also
> knock off one possible cause.... What options do I have if the needle
> isn't mating with the seat?
>
> Thanks,
> Ben Wagner
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