General Category > Quadrajet Carb Talk and Tips

choke pulloff linkage question and - 17080213

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Kenth:

--- Quote from: Cliff Ruggles on May 11, 2020, 05:23:41 AM ---Kenth, LOTS of later 1980's truck Q-jets used a front pull-off as the "secondary" pull-off.  The rear has two links, the front one engages with the choke linkage to unload the choke only and is adjustable via the spring loaded screw on it.......FWIW......Cliff

--- End quote ---

Cliff, thank you, i had to check my book and of course you are correct. Learn something every day!
And, the OPs carb 17080213 is one of these units using the dual action rear p-o and a front p-o also.
Seems a little overkill with the added front p-o but it was used from factory.

Cliff Ruggles:
I typically don't install them and they would only be used if the rear or "primary" pull-off failed.

Same thing with the earlier carbs that used the front as the primary with the link up to the secondaries, installing the rear or "secondary" pull-off is not needed. 

I don't like those anyhow as many have a small bleed hole in them.....

Pav8427:
Good morning gentlemen. For future reference, is there a easy way to tell on the carbs that come factory with 2 PO's, which one is being used as the primary?
Thanks. Doug

tayto:
I think the rear one is "primary" if it has 2 rods. i rebuilt a 301 firebird carb 4 years ago for a friend and the rear pull off only had 1 rod. it didn't pass vac test and i got the ok from cliff to remove it. something about if the front pull off failed the rear would still eventually hold the choke open and prevent a no start and tow fee for the dealer while the car was still under warranty.

Cliff Ruggles:
Just take a look at the secondary airdoor shaft.  If it has a slot for the link the front P/O is the "primary".

If it has a round hole for the link the rear P/O is the primary.

They can be converted to front P/O, I do it all the time.  You will need a front P/O, secondary shaft with a "slot" instead of a hole, and make or fabricate a stop for it.

Several easy ways to make a stop, the easiest is to install a divider in the main casting with the "hood" on one or both sides. 

If not I drill thru the casting and install a 4-40 allen head machine screw for the stop.  I've seen other ways but those are the easiest........Cliff

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