The Ford Barn

sphooch · 06-08-2022, 05:19 PM

HEY GUYS i recently rebuilt my zenith carburetor,.i have a late 31 with the side bowel attached. it was weeping gas and one sugestion was to check the main jet which i found to be slightly short so i changed it out. however now i'm getting a gallop not only at idle but all the time. i reset the timing, cleaned the plugs and regaped them and reset the points. any suggestions out there as to why i can't get the gallop to stop?

Sunny the Model A · 06-08-2022, 05:48 PM

Hi mate! glad to hear of others in the Indented Firewall Gang! now, down to business, when it idles, does it sound like a cylinder missing or is it just random? I had a similar problem with my truck, I had a stuck exhaust valve and it never quite ran right. I did all the same stuff you did and finally decided to pop the head off and lap the valves. But before we discuss that, any other symptoms like having to keep the gav open farther than normal?

Gary WA · 06-08-2022, 07:12 PM

So put the short jet back in and see what happens!! Was it ok prior to changing the jet?

mercman from oz · 06-09-2022, 12:20 AM

Zenith Carburetors

nkaminar · 06-09-2022, 06:35 AM

Is it heading towards the barn. Hard to reign it in when heading in that direction.

Sunny the Model A · 06-09-2022, 08:02 AM

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ok, now that's hilarious.

old ugly · 06-09-2022, 09:41 AM

most likly a fuel/carb issue.
does the GAV change the gallop when adjusting it?

katy · 06-09-2022, 10:20 AM

Quote:

Originally Posted by sphooch

one sugestion was to check the main jet which i found to be slightly short so i changed it out.

Did the replacement jet have the same size orifice as the original? If it's larger that could be your problem.

sphooch · 06-09-2022, 03:37 PM

the gav doesn't have any effect on the gallop?? and the orifice in the jet?? how does one measure it. that is a good possibality. i'll continue working on this soon . thanks for the input.

Sunny the Model A · 06-09-2022, 08:24 PM

you check the measurement of the orifice by using a certain sized drill bit like a feeler gauge. since the gallop is not affected by the gav adjustment, do what the others say on the carb, then check the engine for equal compression on all four cylinders if you can. if one is seriously down, stuck valve

sphooch · 06-10-2022, 10:48 AM

Ok thanks for the tips. we'll see what happens, now i have something to go by.

katy · 06-10-2022, 10:49 AM

Quote:

Originally Posted by sphooch

the orifice in the jet?? how does one measure it.

I use a small (numbered) drill bit index, sizes #61 (.0390") through #80 (.0135")

Like this: https://www.amazon.com/Drill-Index-S...4875528&sr=8-6

06-08-2022, 05:19 PM	#1
sphooch Senior Member Join Date: Jan 2012 Location: New Jersey Posts: 356	My galloping 'a' HEY GUYS i recently rebuilt my zenith carburetor,.i have a late 31 with the side bowel attached. it was weeping gas and one sugestion was to check the main jet which i found to be slightly short so i changed it out. however now i'm getting a gallop not only at idle but all the time. i reset the timing, cleaned the plugs and regaped them and reset the points. any suggestions out there as to why i can't get the gallop to stop?

06-08-2022, 05:48 PM	#2
Sunny the Model A Senior Member Join Date: Jul 2021 Location: Charleston SC Posts: 169	Re: My galloping 'a' Hi mate! glad to hear of others in the Indented Firewall Gang! now, down to business, when it idles, does it sound like a cylinder missing or is it just random? I had a similar problem with my truck, I had a stuck exhaust valve and it never quite ran right. I did all the same stuff you did and finally decided to pop the head off and lap the valves. But before we discuss that, any other symptoms like having to keep the gav open farther than normal? __________________ "Quality means doing it right when no one is looking" Henry Ford

06-09-2022, 12:20 AM	#4
mercman from oz Senior Member Join Date: May 2012 Location: Queensland, Australia Posts: 10,376	Re: My galloping 'a' Zenith Carburetors

06-09-2022, 06:35 AM	#5
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,900	Re: My galloping 'a' Is it heading towards the barn. Hard to reign it in when heading in that direction. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-09-2022, 09:41 AM	#7
old ugly Senior Member Join Date: Aug 2021 Location: alberta canada Posts: 585	Re: My galloping 'a' most likly a fuel/carb issue. does the GAV change the gallop when adjusting it? __________________ old ugly my old father-in-law told me. "listen close when people tell you how to do stuff they may know something. then do it the way you want."

06-09-2022, 08:02 AM	#6
Sunny the Model A Senior Member Join Date: Jul 2021 Location: Charleston SC Posts: 169	Re: My galloping 'a' Sponsored Links (Register now to hide all advertisements) ok, now that's hilarious. __________________ "Quality means doing it right when no one is looking" Henry Ford

06-09-2022, 03:37 PM	#9
sphooch Senior Member Join Date: Jan 2012 Location: New Jersey Posts: 356	Re: My galloping 'a' the gav doesn't have any effect on the gallop?? and the orifice in the jet?? how does one measure it. that is a good possibality. i'll continue working on this soon . thanks for the input.

06-09-2022, 08:24 PM	#10
Sunny the Model A Senior Member Join Date: Jul 2021 Location: Charleston SC Posts: 169	Re: My galloping 'a' you check the measurement of the orifice by using a certain sized drill bit like a feeler gauge. since the gallop is not affected by the gav adjustment, do what the others say on the carb, then check the engine for equal compression on all four cylinders if you can. if one is seriously down, stuck valve __________________ "Quality means doing it right when no one is looking" Henry Ford

06-10-2022, 10:48 AM	#11
sphooch Senior Member Join Date: Jan 2012 Location: New Jersey Posts: 356	Re: My galloping 'a' Ok thanks for the tips. we'll see what happens, now i have something to go by.