1957 carburetor secondary vacuum pull off | Ford Thunderbird forum club group 1955-2005 models

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1957 carburetor secondary vacuum pull off

  • Thread starter Thread starter SlimerSnail
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SlimerSnail

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Thunderbird Year
1957
How long is the shaft supposed to be? I had to tear into the carburetor due to sediment getting in it and noticed that the shaft seems too short. It holds the secondary butterfly open a bit which i dont think is right. There are different shaft lengths available.

Holley 4150 and 4160, 4-barrel Carburetor Primary and Secondary Diaphragms

www.carburetor-parts.com www.carburetor-parts.com


Carburetor is original holley 4150 list 1273-1 "ford code ecz-ad"

Can't seem to find this information anywhere. ?

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I had trouble with my carb. The spring that applies downward pressure to the diaphragm did not have enough strength to push it closed. I changed the spring to a stronger one and fixed the problem.
 
sre said:
I had trouble with my carb. The spring that applies downward pressure to the diaphragm did not have enough strength to push it closed. I changed the spring to a stronger one and fixed the problem.
Click to expand...
My issue is that even if I manually actuate the shaft the butterfly on the secondary is still held slightly open. I think the diaphragm's actuation shaft is too short. Someone must have swapped it out in the last 65 years. When I measured, it appears to be the 2.040" one but I suspect it's supposed to be longer. It occurred to me that I can partially re-assemble the carburetor, disconnect the linkage, and using calipers, estimate how much longer it needs to be. I'll post back tonight or tomorrow with my findings.
 
sre said:
I had trouble with my carb. The spring that applies downward pressure to the diaphragm did not have enough strength to push it closed. I changed the spring to a stronger one and fixed the problem.
Click to expand...
Did you have hesitation at acceleration?
 
I played around with it some more and I think the correct length is the 2.040" one after all! I must have assembled it wrong earlier.
 
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