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FYI - Worn Throttle shafts on Quadrajets

John Ulrich

Well-known member
Joined
Oct 15, 2000
Messages
134
Location
Eagan, MN, Scottsdale AZ
Corvette
1981 Two Tone Claret, 2014 CRT Roadster
My '81 with a Rochester Quadrajet has had a bit of looseness in the primary throttle shaft
for a few years now. While fixing a choke problem, I noticed a lot of gas seeping down
the shafts on both sides as I rotated the throttle (engine off).

I decided now is the time to fix it before I attempt to go to Bowling Green or have it torch
up like a roman candle beforehand. I made a few calls to area parts houses for the bronze
inserts and kept coming up with one name. Knowing I could buy some bushings for $ 5.00
from one vette supplier. I decided not to press Murphy Law and temp fate. So I took the
base in and 20 minutes later on $60.00 lighter, I have wobble free shafts.

Upon buttoning up the carb and running the car I found I had to lower the idle by 250 rpms
because the carb is not sucking extra air from around the shafts (That's my quess!!!)

Moral of the story........If you see drip marks or a puddle forming under your shafts on the
intake manifold this is the cure.

Later,
JU
 
Joined
Nov 4, 2000
Messages
946
Location
Scottsville, Kentucky
Corvette
08 Jetstream Blue Z51 coupe
John,

My '81 had the exact same problem along with the fact that the carb hoggs terribly unless the engine is at 190 degrees. My fix is far more radical than yours.....I am replacing the carb w/a new Edelbrock 750 cfm square bore this week.

Dale
 

Vette81

Gone but not forgotten
Joined
Oct 17, 2000
Messages
37
Location
Madison, Alabama
Corvette
1981 Black Coupe
Dale

Be sure and let us know how the Edelbrock 750 cfm square bore carburetor works!

Darrell
:)
 
P

Phoenix

Guest
They make a kit for q jets cost about 36 bucks.The kit contains a drill bit for the shaft hole new bushings and well plug repair parts and epoxy paste to keep them from leaking. throttle shfts have to be drilled because they are usually out of round
 

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