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04-01-2020, 06:55 PM | #1 |
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Join Date: May 2010
Location: Walnut Grove, Mississippi
Posts: 607
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Carburator Update
Well, replaced the carb with a supposedly rebuilt unit: never thought (I know, rookie!) to check if the gav would turn prior to installation - and now discovered it won't turn either direction. Gav on the old carburator turned perfectly, so the bind must be in the new one. Any suggestions for me? I am hesitant to force it to turn.
Also, any recommendations to whom I should send the old one for a quality rebuild?
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04-01-2020, 07:04 PM | #2 |
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Join Date: Oct 2015
Location: Virginia
Posts: 409
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Re: Carburator Update
If you take the choke control elbow shape lever, off then the GAV top part will slide up and off. Spray some penetrating oil or something similar to lub the threads and then put the top part back on, turn counter clock wise after letting it sit a few minutes. Should loosen up. If not then it may have to come apart with a wrench but the brass is fragile so don't force anything, just keep spraying down in there.
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04-01-2020, 07:13 PM | #3 |
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Join Date: May 2010
Location: maryland
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Re: Carburator Update
All good advise. The only thing I'd add is if you do use a wrench on the brass fitting that you make sure to use a box wrench of proper fit/size, the brass is indeed soft.
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04-01-2020, 07:51 PM | #4 |
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Location: Cow Hampshire
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Re: Carburator Update
I think what has happened is someone set the GAV overly tight, the needle has now "galled" to its seat, and preventing relative motion.
The GAV needle passes through the housing part you see. With the driver off and removed you'll see the half circle of the GAV Needle inside the housing. Using the box wrench (preferably 6 pt. You may want a choice of No. 10 metric and 3/8 - one or the other will fit) if you remove the housing, you get both housing AND the needle. With the two removed you might be able to use a wrench or vise to hold the housing and turn the needle with the driver. You may see the "gall" on the pointy end - this can be cleaned up with emery cloth. Some Zenith have a brass "seat" for the needle to work against. Others have a cast iron seat. Both are prone to this sort of galling. Removing the entire GAV assembly gets you past this post haste. Joe in NH Who only yesterday had the same issue on the identical part - and ended up "crushing" the thin portion of the GAV housing with a pair of vise grips simply to remove it. In my case a torch helped to a successful removal. (Brass and cast iron ALWAYS are easier to remove after heating.) The parts are readily available but you may need to do some "fitment" of the needle to the housing to get the proper degree of resistance to turning.
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04-01-2020, 07:53 PM | #5 |
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Join Date: May 2010
Location: Carlsbad, CA
Posts: 76
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Re: Carburator Update
You may want to take a look at your adjusting needle O.D. I had the same issue and ended up using my old needle.Gas Adjusting Valve.jpg
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04-01-2020, 07:59 PM | #6 |
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Location: Kankakee, Illinois
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Re: Carburator Update
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04-02-2020, 08:11 AM | #7 |
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Re: Carburator Update
tuesday
Last edited by Benson; 04-11-2020 at 08:19 AM. |
04-02-2020, 08:17 AM | #8 | |
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Location: Kankakee, Illinois
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Re: Carburator Update
Quote:
https://jmacarbs.com/ |
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04-02-2020, 10:41 AM | #9 | |
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Join Date: Jul 2010
Location: Cow Hampshire
Posts: 4,188
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Re: Carburator Update
Quote:
The GAV housing CAN be used without the circlip if it is too tight on the needle. The circlip can be substituted with a SMALL o-ring for greater tension than bare fingers alone. And - even if a finger gets broken off, that may be just the right amount of tension on the needle shaft with what remains - with or without the circlip. I'm currently broken but using the metal circlip. You have to play around with it and get the right "feel" to the knob. You want it easy to turn, not galling, but not so loose that the GAV moves by itself under the vibration of the engine. In the Model B carburetor, Ford went with a washer and spring which holds tension on the GAV needle shoulder - a different setup entirely. Joe K
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04-02-2020, 12:43 PM | #10 |
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Re: Carburator Update
Some things
Last edited by Benson; 04-11-2020 at 07:52 AM. |
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