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Author
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Topic: 4300 experts? Missing linkage
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Fastback68
Gearhead Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 08-13-2002 11:33 AM
   
This Autolite 4300 is not exactly the same as mine, but the missing part is right there for me to see. It's that rod that disappears into a slot in the body. On the outside, it connects to the linkage that opens the upper planes of the secondaries.
Without this rod, am I right in thinking there's no way my secondaries can be functioning?
And can I fabricate one with the right wire? The problem is, I can't figure how it would work. When I open the body, there's a recess in the carb base that is clearly designed to take the other end of this rod, with a tiny "cross member" that looks like it should serve as a hook. But if the rod is simply a straight piece of wire, there's no way it can descend into the carb body so the secondary planes can open.
I bought a parts carb yesterday, but it's missing on that one too 
Can anyone explain what this part looks like that I'm missing?
Thanks a lot,
Simon
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Clark
Gearhead Posts: 592
From: Rowlett,Texas
Registered: Aug 99
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posted 08-13-2002 01:51 PM
Your right about needing that rod and if you need one or good advice contact the people at www.ponycarbs.com Excellent support and good people.------------------
69 351W Sportsroof Deluxe
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68 S-code GT
Gearhead Posts: 1129
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 08-15-2002 08:05 AM
I think there should be a plunger or piston on the other end. I?ll take a look at one of the parts carbs I have when I get home!
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68 S-code GT
Gearhead Posts: 1129
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 08-16-2002 07:40 PM
It?s called a secondary air valve rod and piston. The rod goes into the carb where it is connected to a small piston and there is also a spring that will sit below the piston. The spring will push the rod up and close the secondary air valve or plates closed when your foot is off the gas.I also found out that the screw that you had in the back of one of your carb is called an idle air bypass screw. What it does I can?t tell you! I have 68s and 69s but they have neither!
[This message has been edited by 68 S-code GT (edited 08-22-2002).]
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Fastback68
Gearhead Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 08-16-2002 08:39 PM
Heh thanks a lot! You've obviously put some work into this - much appreciated!
Idle air bypass screw ... hmmm.
Simon
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68 S-code GT
Gearhead Posts: 1129
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 08-17-2002 03:34 PM
There is also a spring that the idle air bypass screw holds in. 
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Fastback68
Gearhead Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 08-17-2002 10:23 PM
That's right. I pulled the idle air bypass screw all the way out last night. It's really long, and maybe, just maybe, is intended to cover or uncover a tiny hole I found deep inside the venturis. The spring, however, has no apparent function.
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68 S-code GT
Gearhead Posts: 1129
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 08-22-2002 11:14 PM
Were you able to open the pictures I sent you?The 68 shop manual makes no mention of the screw but does show a cavity there in a cross section of the carb. The rebuild kit instructions say to turn it in all the way and then back it out 3.5 turns. What year carb is it? [This message has been edited by 68 S-code GT (edited 08-22-2002).]
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