Carter carb
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
Carter carb
Cleaning and checking under the hood of my newly acquired 65 327 300 hp.
As I’m adjusting the choke and linkages I noticed the secondarys do not open at full throttle when the engine is off.
I know im getting old and can’t remember but don’t they open mechanically or are they vacuum operated?
As I’m adjusting the choke and linkages I noticed the secondarys do not open at full throttle when the engine is off.
I know im getting old and can’t remember but don’t they open mechanically or are they vacuum operated?
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
No. I said the secondaries could be locked out. I don’t know what type Carter carb you have. On the WCFB the secondaries are mechanical with air flow in the bores controlled by auxiliary air valves riding above the secondaries.
Last edited by Frankie the Fink; Aug 1, 2018 at 07:22 PM.
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
While looking at the carb I remembered another post when you told the OP to check the pin in the fuel pump. Here’s a picture of mine. In your photo it’s the rear of the pump in mine it’s the front.
Before I crawl under the car tomorrow let me ask should the pin extend that far out?
thanks for all your help
Jim
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
While looking at the carb I remembered another post when you told the OP to check the pin in the fuel pump. Here’s a picture of mine. In your photo it’s the rear of the pump in mine it’s the front.
Before I crawl under the car tomorrow let me ask should the pin extend that far out?
thanks for all your help
Jim
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
While looking at the carb I remembered another post when you told the OP to check the pin in the fuel pump. Here’s a picture of mine. In your photo it’s the rear of the pump in mine it’s the front.
Before I crawl under the car tomorrow let me ask should the pin extend that far out?
thanks for all your help
Jim
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
Perfect example of pin "walkout"..
There are several fixes for this and pictures on the forum...some make a bracket to block the pin moving on each side that's held by the fuel pump mounting bolts; others have used a pin with a head on one end and a groove on the other end which is secured by a "C" clip...
There are several fixes for this and pictures on the forum...some make a bracket to block the pin moving on each side that's held by the fuel pump mounting bolts; others have used a pin with a head on one end and a groove on the other end which is secured by a "C" clip...
Melting Slicks
Joined: Jul 2005
Posts: 2,554
Likes: 381
From: Strongsville, OH
2016 C2 of the Year Finalist
The pin that failed. You can just see part of the hole in the arm that the pin was supposed to be through and how far the arm has moved forward.
I made a stop to put under each bolt when I installed the new pump.
Don’t drive the car with that pump. When I removed mine that did that and looked that way, the entire arm inside was twisted and bent from being off its pivot. I was lucky to have made it home. Looks like you’ve got yourself your first repair job but you’re fortunate you found it now.
Dave
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
I’ll be getting a new pump tomorrow. Have the vette 6 or 8 weeks and not even close to my first repair. Replaced the carpets, master cyl,motor mounts,
repositioned the exhaust, repaired rev lamps and dash E brake lamp.... I’m sure I’m forgetting something.
But I enjoy my car!
repositioned the exhaust, repaired rev lamps and dash E brake lamp.... I’m sure I’m forgetting something.
But I enjoy my car!
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
Good!
Your picture went in my archive for the next time someone asks me to describe the problem....classic...
I also found it interesting that the pin "walked" forward...it actually made me go out and check my fuel pump again
Your picture went in my archive for the next time someone asks me to describe the problem....classic...
I also found it interesting that the pin "walked" forward...it actually made me go out and check my fuel pump again
Last edited by Frankie the Fink; Aug 3, 2018 at 08:37 AM.
Melting Slicks
Joined: Jul 2005
Posts: 2,554
Likes: 381
From: Strongsville, OH
2016 C2 of the Year Finalist
My pump arm was so torqued and twisted there was no way the pin would go back in. You were able to find the problem in time to prevent further trouble. Glad it worked out so well. Dave
Dave
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,271
As stated, the AFB has a secondary throttle lockout that prevents the secondaries from opening when the engine is cold. The auxiliary air valve is there to prevent "lean bog" from low air velocity/venturi signal when you floor the throttle at low revs. Notice that the shaft is offset, which allows manifold vacuum to open the valve, and they are typically full open at about 2500 revs.
With the engine hot, use a popsicle stick to open the aux. air valve, then open the throttle wide and check that all four butterflies are full open. There is a very good section on the AFB in the 1963 Corvette Shop Manual which you should have along with the '65 Supplement. The AFB section includes are the requisite adjustments and overhaul procedure.
Duke
With the engine hot, use a popsicle stick to open the aux. air valve, then open the throttle wide and check that all four butterflies are full open. There is a very good section on the AFB in the 1963 Corvette Shop Manual which you should have along with the '65 Supplement. The AFB section includes are the requisite adjustments and overhaul procedure.
Duke
Thread Starter
Instructor
Joined: Dec 2015
Posts: 233
Likes: 8
From: Jupiter Florida
It worked out so well mainly due the all the help from forum members like Frank and you!