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Quadrajet idle mixture screw cap removal

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davel:
I'm just posting this as a reference for anyone attempting to remove the idle mixture screw caps on their Quadrajet.  This particular carb is model #17059226 from a 1979 G20 Van with a SBC400.  The idle mixture screw caps on this carb are hardened so it's not possible to drill through them.



This rotary accessory kit can be purchased from Harbor Freight for $20



It contains a number of different abrasive cutting wheels.  This one is the smallest and it cuts right through the hardened steel cap.



I chucked it in a cordless drill and made 3 horizontal cuts through the cap and 2 light vertical scores. Then used a small punch and hammer to break a hole in the cap.



You can now hook the cap with the thread of a drywall screw. Grab the screw under the head with a locking pliers and drive the cap out by tapping up on the pliers with a hammer.  It takes some force.



Voila!



This method leaves very light score marks on the front of the base plate by the mixture screw holes. These marks can easily be removed with a file.


Online I couldn't find any images or dimensions of the cap or it's depth in the baseplate in relation to the mixture screw.  So here's that info.






Different model/year Quadrajets may have different types of caps.  That I don't know for sure.  But this cap actually fully encapsulated the screw head inside the baseplate.   

mcx:
...very nice write up with pictures...now would be a  good time to cut grooves in those mixture  screws to allow use of a regular flat head screw driver.

Cliff Ruggles:
I sell metric threaded idle mixture screws that are longer and stick out of the baseplate plus slotted for a screwdriver, the are $8 per pair......Cliff

mcx:
  Cliff....what are the measured length of your custom mixture screws?

77cruiser:
Why are the pictures all blurry?

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