General Category > Quadrajet Carb Talk and Tips
Primary throttle shaft allowable play?
daveo76:
I'm finally getting around to putting together my Edelbrock 1903 Q-Jet. I bought the basic rebuild kit from Cliff's about 6 (or more) months ago. I was planning on not bushing the shaft, but now I am not so sure. There is about .01-.02" side to side play, will bushings be tighter than that? Is it worth it for this carb? If I buy the bushing kit sold here is it fairly idiot proof? Do you need a drill press or can I do it safely with a hand drill? Would hate to screw up my base plate. Also how hard is it to put the throttle plates back together? Thanks, Dave.
73 Z28:
With .010 to .020 of play , you should install bushings to prevent vacuum leakage at the throttle shaft. Make sure to use a vernier caliper to get an accurate measurement of the bushing o.d. before drilling. Be sure to grind off the staked ends of the throttle blade screws before trying to remove them or you'll break them off in the throttle shaft. It really is not too hard but if it's your first time doing one, find a junk carb baseplate to practice on, then do your carb.
Good Luck!!
Paul
daveo76:
Thanks, Paul. I'm thinking about buying the rebuild kit from Cliff that comes with the drill bit I'd need. Only problem is it's a lot of money for the one carb I need to do. Good tip about the grinding off the staked part of the screws. Dremel tool work pretty well for that?
73 Z28:
The dremel tool with a small cutoff wheel works great for removing the staked part of the throttle blade screws. Oh and if your from the metro detroit area, let me know and I'll give you a baseplate to practice on first.
Paul
motorvation2go:
Hi Dave,
Just read your inquiry (re bushed throttle shafts).
I would strongly advise against using a regular drill bit for sizing shaft bores in prep for bushing install.
Get Cliff's kit for this purpose (includes self guiding drill bit)... otherwise you run a very good chance of messing up your baseplate with misaligned holes.
Just a word of caution.
Good luck with your Q-jet... great carbs!
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