General Category > Quadrajet Carb Talk and Tips

What will i see when i drill out caps on mixture screws???

(1/2) > >>

Mr.Pontiac:
I was given a really nice 85 Buick- 800 cfm body & base. I would like to remove the metal caps covering the idle screws. So what will i see once caps are removed??? plain old idle mixture screws or something else???

Cliff Ruggles:
Usually tamper proof screws that require a slotted tool to turn them, but a few were actually hex drive.....Cliff

Mr.Pontiac:
Yep i made a slotted tool for removing the idle screws alright. Just a friendly reminder if anybody trys to remove the plugs. I tryed drilling them out, forget it!! drill bit would not touch them. Ended up with a small 3/16 carbide endmill in a small milling machine, once plugs are removed use some penetrating oil on the idle mixture screws really helps. Also once out something that needs to be addressed is the idle mixture screws look to be of a weird size.no.6-48 maybe. my machinist handbook only shows 48 thread for a no.4 i think a no. 4 is to small. Does anybody make idle screw replacmants for these carbs??Looking into it deeper.I want to run a tap down the thread to clean up area into carb. It may also require a extra long special tap because holes are recessed and you cannot get anything to turn the tap once inside. Use caution!! Hope this helps someone out! Rich

77cruiser:
I think those are metric.

http://quadrajetparts.com/idle-mixture-screws-springs-17062905-2003-p-125.html

AnotherMOPAR:
the '88 on my ramcharger had the first mentioned style. I bought a weird posable adjustment tool a while ago that had the 'DD' tip for that kind of screw so i just left them. But it was cast, around plug, plug over needle. If the plug is cut out entirely youre left with the indented area and holes for the adjustment screws. Easy access without emmission stuff in your way while the carb is on even right up front when all is said and done.  ;)

Navigation

[0] Message Index

[#] Next page