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04-07-2021, 11:40 PM | #1 |
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Join Date: Nov 2015
Location: Roseville Ca.
Posts: 141
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Zenith Troubles
Trying to fix a leaking carb. Went & purchased a carb kit. After finishing the carb I had a extra jet. Call & was told that some carbs had brass inserts & mine didn't. I looked ten time where I could have messed up. Part 2, leaking out the bottom hole. Float mess up I guess. The easy for Dummies to set the float @ 5/8 ?
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04-08-2021, 12:06 AM | #2 |
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Re: Zenith Troubles
Check to see you didn't leave an extra gasket in the main jet.
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04-08-2021, 12:36 AM | #3 |
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Re: Zenith Troubles
The early Zeniths have a brass seat that screws into the base of the GAV tunnel. They look similar to the comp jet, but are definitely not the same, so don't mix them up. Ford eliminated the brass seat because people had a tendency to close the GAV valve too tight and the needle would seize in the seat and when they backed it out instead of opening the valve they unscrewed the seat. Ford then just used the cast housing material as the seat, worked fine.
The extra "jet" in your kit is probably the GAV seat. Most Zenith leaks are due to the float valve not set at the correct height or not holding. This allows the fuel level in the reservoir to rise above the tips of the main and cap jets. It then spills over the tops and runs into the throat of the carburetor and exits through the little weep hole in the bottom. Best to install a Viton tip float valve, they hold better. Tom Endy |
04-08-2021, 07:53 PM | #4 |
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Re: Zenith Troubles
Also check to make sure the cap jet is fully seated. The jet tool can sometimes jam against the boss, and you think it is seated, but it isn't.
And I know this because.....
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Bill Worden 1929 Roadster 1929 Briggs Town Sedan 1930 Closed Cab pickup Smith Motor Compressor 1951 Ford F1 High Desert Model A's |
04-09-2021, 04:01 AM | #5 |
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Location: Gwynn's Island Va
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Re: Zenith Troubles
Check the top of the bowl for a hairline crack. Usually on the engine side of carburetor. Will weep fuel down and drip off bolt. I went through 1 carb 4 times before I found it.
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04-09-2021, 07:32 AM | #6 |
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Re: Zenith Troubles
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04-09-2021, 09:06 AM | #7 | |
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Re: Zenith Troubles
Quote:
Oh, and BTW, great username!! |
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04-09-2021, 10:50 AM | #8 | |
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Re: Zenith Troubles
Quote:
JayJay
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04-09-2021, 01:09 PM | #9 |
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Re: Zenith Troubles
When rebuilding I always rub the area where the float valve stem hits the brass float. It will create a small divot in the brass. Scrub this area with 320 (very fine sand paper) to remove any ridges in the brass. The setting is 5/8 in. in the literature but I like to go a bit deeper 11/16 in. but less than 3/4 in. This practice will give you a bit more leeway before you spill over the Main and Cap Jets especially if you are parking up hill! Usually I find that you need two float valve gaskets to get a decent bowl level setting. Ed
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04-09-2021, 01:27 PM | #10 | |
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Re: Zenith Troubles
Quote:
JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan Last edited by JayJay; 04-09-2021 at 01:36 PM. |
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