Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 12-31-2019, 12:42 PM   #1
Ed in Maine
Senior Member
 
Join Date: May 2010
Location: Washington Cty., ME or Flagler Cty., FL
Posts: 1,106
Default Zenith Carb Float Valves

Recently I have had some problems with my float valve leaking and sticking closed. I would like to know what type of float valve has given you the best service? Where are you purchasing them? Thank you, Ed
Ed in Maine is offline   Reply With Quote
Old 12-31-2019, 01:23 PM   #2
jb-ob
Senior Member
 
Join Date: Jun 2010
Posts: 631
Default Re: Zenith Carb Float Valves

Ed, Your question is similar to asking what motor oil to use.


Which float valve are you currently using and being it's winter Maine, how much are you driving ?? Do you have a truly functioning gas shut off valve. ?


I've had three Viton tipped valves fail completely so they are a non-item for me.


The Model A owner in the south west who can drive year round might be having success with the two ball style gross jet. With the rubbish that we are sold for gasoline and after two months of inactivity, I had the small ball glue shut the valve = no gas flow.


The replacement steel valve with brass housing needs to be cleaned of any machining debris and the valve lapped to the seat.


What's left ? Using an original 90 year old factory Ford installed valve ?? Never would believe it but they still work extremely well.....just tough to find.


For winter drain the tank of gas, use it in your snow blower until spring. Then experiment with all the suggestions you will get to your question.
jb-ob is online now   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 12-31-2019, 02:00 PM   #3
Tom Endy
Senior Member
 
Tom Endy's Avatar
 
Join Date: May 2010
Location: Southern California
Posts: 3,122
Default Re: Zenith Carb Float Valves

I have had good results using the Viton tip float valves from Bratton's. A word of caution though, Bratton's like any retailer, is at the mercy of their supplier. Before using them I take them apart and clean out any residual machine chips found inside.

My observation has been that the two-ball float valves do not work well. I have seen a number of then stick shut. It may have something to do with what is in the gasoline here in Southern California.

Tom Endy
Tom Endy is offline   Reply With Quote
Old 12-31-2019, 03:18 PM   #4
wmws
BANNED
 
Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
Default Re: Zenith Carb Float Valves

I agree with Tom on the Vinton tip. But you have to be picky. I got one from Bratton's and it leaked. I took it apart but didn't see anything so put it back together. It still leaked. So I ordered another one from Bratton's. It also leaked so I sent it back to Bratton's and they sent me another for free. It also leaked so I sent it back and they sent me another one for free which worked just fine and has been in my car for about a year now. As I recall Bratton's said that you get about one good one for three.
wmws is offline   Reply With Quote
Old 12-31-2019, 03:21 PM   #5
JD 1931
Senior Member
 
JD 1931's Avatar
 
Join Date: Jul 2010
Location: west coast Fla..
Posts: 311
Default Re: Zenith Carb Float Valves

I have built hundreds of Zenith carbs for the model A and found that the original steel float valve performs well and can be found at Brattons. They seem to do well with todays gas and sometimes the old ones can be restored if the stainless pin and brass is not pitted or worn. Old Zeniths are get harder to find that are suitable to rebuild, the old inventory is being exhausted....
JD
JD 1931 is offline   Reply With Quote
Old 12-31-2019, 05:10 PM   #6
mhsprecher
Senior Member
 
mhsprecher's Avatar
 
Join Date: Aug 2012
Location: Takoma Park, MD
Posts: 2,811
Default Re: Zenith Carb Float Valves

Sponsored Links (Register now to hide all advertisements)
FWIW, I had bad luck with Viton tipped valves. I wasn't patient enough to keep trying them until I found one that worked. 66% failure rate isn't very good.
__________________
1924 Model T Coupe
1928 Model A Roadster
1930 Model A Town Sedan
1939 Deluxe Fordor
1945 pickup
1951 Custom convertible
mhsprecher is offline   Reply With Quote
Old 12-31-2019, 08:22 PM   #7
Norm M
Junior Member
 
Join Date: Jan 2014
Posts: 28
Default Re: Zenith Carb Float Valves

I've rebuilt a number of Zenith using both the Viton and the original style float valves and have found that the Viton valves require more shims than the original valve in order to get the desire fuel level in the bowl (if you measure them you will see the difference). I prefer the original style float valve.
Norm M is offline   Reply With Quote
Old 12-31-2019, 08:48 PM   #8
holdover
Senior Member
 
Join Date: May 2011
Location: SW Virginia near the Blue ridge Parkway
Posts: 674
Default Re: Zenith Carb Float Valves

And I thought it was only me that found the new valve was worse than the old one, purchased 3 so far, none work. I am getting ready to machine a needle and seat so I can drive my TuDor
holdover is offline   Reply With Quote
Old 01-01-2020, 11:49 AM   #9
Flathead
Senior Member
 
Flathead's Avatar
 
Join Date: May 2010
Location: Southern Maine
Posts: 1,492
Default Re: Zenith Carb Float Valves

The modern fuel will make a viton needle stick shut if the vehicle sits long enough with the bowl full. I have seen this repeatedly with golf cars stored over the winter. Golf cars aren't Model A's but the needle valves don't know that. A solution for them was having a wire clip that loosely connected the needle to the float, when the bowl empties the weight of the float will pull the needle open. Most all "modern" carbs do this.
Flathead is offline   Reply With Quote
Old 01-01-2020, 05:18 PM   #10
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: Oregon
Posts: 5,947
Default Re: Zenith Carb Float Valves

Quote:
Originally Posted by flathead View Post
the modern fuel will make a viton needle stick shut if the vehicle sits long enough with the bowl full. I have seen this repeatedly with golf cars stored over the winter. Golf cars aren't model a's but the needle valves don't know that. A solution for them was having a wire clip that loosely connected the needle to the float, when the bowl empties the weight of the float will pull the needle open. Most all "modern" carbs do this.
amen!
J Franklin is online now   Reply With Quote
Old 03-04-2020, 08:33 PM   #11
fishboy
Junior Member
 
Join Date: Oct 2019
Posts: 1
Default Re: Zenith Carb Float Valves

What is the method for lapping the needle to the seat??
Thanks
fishboy is offline   Reply With Quote
Old 03-04-2020, 09:33 PM   #12
Rich in Tucson
Senior Member
 
Rich in Tucson's Avatar
 
Join Date: May 2010
Location: Tucson, Arizona
Posts: 374
Default Re: Zenith Carb Float Valves

Try to "stake" it first - place seat on anvil and tap needle with ball pein hammer face (don't hit hard, or soft, just let hammer fall on to it by relaxing your wrist), hit it once square (or twice if you reflexively held back!).

I have lapped with toothpaste as a lapping medium or with valve grinding compound by turning the needle on the seat by hand, but I find that staking never fails. I always stake new needle and seats (even NOS) and bench test carburetors in various ways and it is obvious when an old in service valve needs staking...
Rich in Tucson is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:39 AM.