General Category > Quadrajet Carb Talk and Tips

choke pulloff linkage question and - 17080213

(1/3) > >>

sploke:
I tore this carb down to clean and rebuild it, and took a bunch of pictures in the process, so I'm about 95% sure I put this back together the way it was when I took it apart...but I'm also like 80% sure it's not attached correctly.  The rear choke pulloff has two attachment points on the plunger....I think the outermost one (closest to the camera in the first pic) should not be used, and the linkage rod that is attached to that one should actually go from the secondary air valve shaft to the front choke pulloff.  I.e. 180 degrees from how it is now.  Is that correct?

Also, the front choke pulloff fails the vacuum test so I need to replace that...is this the correct replacement?

https://cliffshighperformance.com/Quadrajet-rebuild-kits-and-quadrajet-parts/quadrajet-76-choke-pull-off









Also - what is this vacuum device?  It's hooked up to what I understand is the distributor vacuum advance port on the carb body, and it extends when I apply vacuum, but not far enough to interact with the throttle lever so I'm not sure about what it's purpose is.

Kenth:
You have a 1979-80 Chevy/GMC Truck Quadrajet. Very nice units.
Your first three pictures shows the upper, air valve, link mounted in the wrong direction.
Your 4:th picture shows a front choke pull-off that does not belong to this style Truck Quadrajets. All the choke pull-off and air valve dampening is handled by the rear unit.
Your last two pictures shows a throttle lever actuator which is connected to the ignition spark port. This actuator has no real purpose on a properly modified/adjusted Truck Quadrajet.

Hope this helps some.

sploke:
Very helpful, thanks.  So the outer linkage I need to flip around to the air valve link.  I think it also need some significant adjustment because when the pulloff actuates, it is not engaging the air flap at all.

Good news that the front pulloff isn't needed, so if it doesn't work I can just eliminated it entirely.

I'll also remove the throttle lever actuator if that's not needed either.

The carb is being mated to it's original 350, which came out of a 1984 truck, but it's being used to repower an old farm tractor.

Cliff Ruggles:
The only thing I can add is that some of those carbs used a front pull-off, which is OK but isn't needed provided the rear one works and is adjusted correctly. 

The front pull-off simply becomes the "secondary" pull-off and the rear one is the "primary" in that scenario.......Cliff

sploke:
Can it even be considered a secondary pulloff if there's no linkage attached to it?  There's an adjustment screw attached to it, but no linkage to engage with the air valve.

Navigation

[0] Message Index

[#] Next page