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Any New Ideas on Stuck Carburetors?

Discussion in 'The Hokey Ass Message Board' started by jack orchard, May 9, 2013.

  1. jack orchard
    Joined: Aug 20, 2011
    Posts: 238

    jack orchard
    Member

    I have 2 Autolite 4100 4-barrel carburetors with stuck throttle shafts. Does anyone have any new ideas to free the stuck throttle shafts without destroying the aluminum carb bodies? Many thanks to all of you in advance. Thanks again, jack
     
  2. Zombie Hot Rod
    Joined: Oct 22, 2006
    Posts: 2,451

    Zombie Hot Rod
    Member
    from New York

    Yes, rebuild them.

    Take everything apart, and what you can't free up spray with penetrating oil. . . if it's still stuck just put it all into a bucket of carb cleaner and wait a day or two.
     
  3. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don
    Member

    I had a valuable AFB that was stuck. I drilled a tiny hole from the bottom up to the shaft until the chips turned a different color, then soaked with PB Blaster for about a week. It freed up very well.
     
  4. carbking
    Joined: Dec 20, 2008
    Posts: 2,790

    carbking
    Member

    We have successfully used an ultrasonic cleaner.

    Those that don't come loose after the ultrasonic come loose with controlled heat.

    Jon.
     
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  5. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Another thing...Evaporust. I think this is about the only deruster that won't hurt zinc or anything else in a car. You can safely drop in a complete carb. It will at least clear the neighborhood on the shaft, and it does have some limited penetrating ability from surfactants in the mix.
    Carb shafts in general have a bit of endways play, and tapping them sideways in both directions will sometimes get things started.
     
  6. big M
    Joined: Mar 22, 2010
    Posts: 709

    big M
    Member

    The only thing I have had work is carefully heating the steel throttle shafts, then cooling with ATF. Dissimilar metal corrosion can be a bear to unfreeze!

    ---John
     
  7. slammed
    Joined: Jun 10, 2004
    Posts: 8,161

    slammed
    Member

    Kroil. Or homemade Kroil: 50/50 Acetone & ATF. Let it soak for a long while.
     
  8. hobbyjp
    Joined: Mar 14, 2006
    Posts: 327

    hobbyjp
    Member
    from socal

    There is no substitute for time, you gotta let it soak for a few days in carb cleaner or other non corrosive chemical, I have had some luck boiling carb parts in water and then allowing them to cool, the expansion and then shrinking free's them up.
     
  9. Thats what I do. Just takes time, but always works.
     
  10. sunbeam
    Joined: Oct 22, 2010
    Posts: 4,853

    sunbeam
    Member

    Hey Jack try bathroom bowl cleaner.
     
  11. jack orchard
    Joined: Aug 20, 2011
    Posts: 238

    jack orchard
    Member

    Hi Paul
    You've seen my bathroom, haven't you...jack
     

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