General Category > Quadrajet Carb Talk and Tips

Primary throttle shaft allowable play?

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daveo76:
Thanks, guys. 

Paul, I live near Portland, OR so borrowing your old baseplate probably won't work for me!  Thanks for the offer, though.  (I actually have an old Q-jet I can use to practice on)

motorvation2go - thanks.  I think I'll either buy the kit or take the base plate to a carb shop and have them do it for me.   Since I'm only doing one carb for now it might be a wash.

Dave

redman76:
You can do yourself.  I bought the kit from Cliff and it is pretty rookie proof; the self guiding drill bit is the key to ease and success here.  I just did mine for first time with no problems and now there is no play anymore.  You can just use a hand drill.  As careful as I was, I did manage to break off one of the shaft screw heads on the secondary shaft.  Tried to drill out, but I ended up tapping for next size screws.  Cliff has the correct size screws and you can buy the tap at the hardware store ($5) if you do not have one.  I found that if I carefully remove the screws just like you are retapping (screw out a little, screw in a little, screw out a little more, screw in, etc. that I did not break any screws.  I went ahead and retapped the screws on the primary shaft while I was at it.

Cliff Ruggles:
Good advise to avoid drilling for bushings with a standard drill bit.  It will NOT follow the original hole, and the holes will end up to large to effectively hold the bushings.  We see a LOT of baseplates ruined in this manner.....Cliff

daveo76:
Thanks all for the good advice.  I ended up using a reaming bit in reverse.  Shank of the bit through the base plate holes and then attach the drill to the cutting portion of the bit and run the drill in reverse.  Worked pretty well.  Bushings and shaft are installed and everything seems to operate tight  and smooth. 

I used new screws with red loctite on the throttle plates.  Is that good enough or should I stake the screws as they did from the factory?  I don't want to damage anything in the staking operation, but I also don't want a screw falling down into my intake.  That would probably be pretty bad....

Dave

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