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09-29-2017, 10:26 AM | #1 |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
Posts: 432
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fixing leaky carbs
I’ve noticed a lot of threads about leaking carburetors, and I discovered something due to you guys and U-tube. Those float valves and seats in the old carbs were not as precisely machined as newer carbs. The all metal valves weren’t bad but really need to be polished once in awhile, and the brass seats get cruddy and need to be polished as well in order to really stop fuel when the float is up. It makes sense that those two have to fit really well to cut off the inflowing gas. I used a cordless drill with a Q-tip with windshield polishing compound on it to polish the seat when it was out of the carb, but I think just regular toothpaste would work as well. Wow, what a difference. Then, I used really fine steel wool to polish the tip of the valve. Again, what a difference. When I put everything back together, no matter how hard I blew on the fuel inlet when the carb was upside-down, no air was able to get by that float valve and seat and into the float chamber.
This is an easy fix, and in the future I’m going to include it with oil changes and lubes. Maybe more often than that. Thanks for letting me share another thing I’ve learned about my A. My reading and other chores are suffering because of the time I’m spending on my ’29 cabriolet, but I’m sure not bored. I’ll probably get the thing running about the same time as the rain starts, and my car is definetly not designed for wet weather. Have a good one guys. Isn’t it wonderful to be learning soo much so late in life. |
09-29-2017, 12:15 PM | #2 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: fixing leaky carbs
Thats nice to report back. It'll be nice to hear how they work when on a vehicle.
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09-29-2017, 02:03 PM | #3 |
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Join Date: Jan 2017
Location: Maryhill Ont Canada
Posts: 834
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Re: fixing leaky carbs
Thanks Mike.
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09-30-2017, 01:17 PM | #4 |
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Join Date: May 2010
Location: Washington Cty., ME or Flagler Cty., FL
Posts: 1,107
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Re: fixing leaky carbs
Hello Wingski, I also spend too much time having fun with my Model A. What is suffering around my house is outside maintenance, paint and caulking! I have to get back to it or I will be changing out some of the trim that has rotted! Back to your work on the carburetor, It is also important to know that the carb can be dripping from gas spilling out of the jet in throat of the carb. By design, the gas has to be very near the tip of the jet to get aspirated into the flow stream. This is why it is important to have the float level set correctly. I have seen with my car that if the car is parked on a very steep hill pointing up hill, it can overflow the jet and appear to have a bad float valve. I hope you get to enjoy the hobby many more years. Ed
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10-01-2017, 12:13 AM | #5 | |
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Join Date: Jul 2017
Location: Cave Junction, Oregon
Posts: 432
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Re: fixing leaky carbs
Quote:
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10-01-2017, 06:53 AM | #6 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: fixing leaky carbs
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A high compression head and a counterweighted crank helps at all speeds and at all times the engine is running, so that's the first two improvements I'd add to the engine. |
10-01-2017, 07:55 AM | #7 |
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Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Re: fixing leaky carbs
Yo' BRO Wingski,
Not trying to sound STUPID, but with a little creative GENIUS, you could set up DUAL GAV/CHOKE rods. It would be a little "tricky" to learn to choke them simultaneously--LOL Bro Bill
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10-01-2017, 08:03 AM | #8 |
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Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Re: fixing leaky carbs
[QUOTE=Tom Wesenberg;1533931]Dual carbs only help when you want more flow than one wide open Zenith can deliver, and how often do you drive wide open?
Tom, WIDE OPEN gets me the CLOSEST parking & the best SEAT at an Ice Cream Place, aptly named, "THE SCOOP"! AND, that's "THE REST OF THE SCOOP" Bill Oink
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10-01-2017, 08:05 AM | #9 |
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Join Date: Jan 2016
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Re: fixing leaky carbs
Wings, thanks for the tip.
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