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08-12-2010, 08:15 AM | #1 |
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Join Date: Aug 2010
Posts: 7
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Still More Carburetor Questions
I am having a lot of difficulty seting the float. No matter what the carb overflows. I have removed the bowl with the carb on the car, turned on the fuel with my thumb pushing the needle into the seat and the fuel stops. I have checked the float for leaks and it checks ok. I believe that I am not setting it corectly. Does anyone have the correct measurement for float height on a Tillotson F-1B??? The book I am referencing is not very detailed when it comes to float setting.
Thanks in advance, Angelo |
08-12-2010, 08:26 AM | #2 |
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Join Date: May 2010
Location: Largo Florida
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Re: Still More Carburetor Questions
I don't know about the F-1B, but, I think all Tillotson floats are the same.. The only info I've found for the float height is 1" [ top base with no gasket to top of float], but, mine run better at 3/4".. As far as the leak goes, they tend to do that.. Look at the float arm for a little dimple where the needle makes contact , sand/emery the arm till the dimple disappears.. See if that helps..Which needle do you have[solid or rubber]?? 'They' claim that the newer viton tip needle is less likely to leak..
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08-12-2010, 08:45 AM | #3 |
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Re: Still More Carburetor Questions
I cant see what the needle sets against but I think it just seals against brass, its a one peice brass needle and seat that threads into the carb.
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08-12-2010, 08:58 AM | #4 |
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Location: Naperville, IL
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Re: Still More Carburetor Questions
The metal to metal needle and seats are very difficult to keep from leaking. If one is available, I suggest that you purchase and install a Viton needle. I have been using them in my Zenith carbs with great success. Gar Williams
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08-12-2010, 09:47 AM | #5 |
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Location: Ontario, Canada
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Re: Still More Carburetor Questions
Tillotson: Models F-1B, X, and XF
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08-12-2010, 10:07 AM | #6 |
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Location: OKC / Tonkawa, Ok.
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Re: Still More Carburetor Questions
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08-12-2010, 10:10 AM | #7 | |
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Location: Alabama
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Re: Still More Carburetor Questions
Quote:
As far as I know there is NO parts produced for the F-1B carb. Some Zenith parts can be used such as the float , GAV assy, and with a little modification, the gaskets. I'm not sure about the needle valve assy. The F-1B looks very simillar to the Zenith but being as it is made of pot metal, there is a good chance that the flange will be warped where it meets the intake manifold. You can lay the flange on a flat surface and if there are any small gaps around the circumfrence of the flange this will indicate warpage. Any warpage in the flange wuill cause vacume leaks and VERY POOR performance. Usually the main problem with the F-1B carb. is that the small passages become blocked. I think that Mr Texas is probably the guy with more experience with these carbs. I saw where he posted here a couple of days ago on a thread about Tillotson carbs. If all else fails I would search and try to contact him for other pointers. I think he was offering to send out exploded diagrams an info on these carbs on the ford barn a couple of years ago. Good luck and keep us posted. |
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08-12-2010, 10:12 AM | #8 | |
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Location: Windy City
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Re: Still More Carburetor Questions
Quote:
Something is preventing the float from easily moving the pin. There should be no worn groove, divot, or rough spots on the engagement tab, the base of the pin, or the float pivot/ hinge. If the float is bent slightly off-center it can scrape the side of the bowl when assembled and hang up. I wouldn't be in a hurry to put in a viton-tip valve. If you do replace the valve, use another steel pin valve. The viton tip valves tend to stick to the seat, especially when parked hot and allowed to cool off and sit for a few days. Cars with fuel pumps have no trouble popping them open, but an A with 1/4 tank and gravity may require you to rap sharply on the carb to free it. |
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08-12-2010, 12:10 PM | #9 |
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Re: Still More Carburetor Questions
Got a different float and problem solved
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08-12-2010, 09:24 PM | #10 |
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Posts: 447
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Re: Still More Carburetor Questions
These metal needles seal best if the float is pushing them straight up and not to the side. If yours is pushing the needle to the side, you will need to bend something on the float.
Rotating the needle while pushing in with pliers helps to reduce or eliminate a leak. Some people say to rotate with a drill motor, but I think that to be too much. |
08-12-2010, 11:45 PM | #11 |
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Location: Quincy, CA.
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Re: Still More Carburetor Questions
I found, at least with the Zenith, that for a long time A parts dealers were advertising " install the gross jet float valve and stop your carburetor from leaking".
The ball in the gross jet valve is only a few thousnads above the ball cage; if not careful, the float will bottom on the cage and not apply pressure to the ball; hence, a leaking carburetor, usually over the top of the main and cap jets. Ron |
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