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v6 vaccum diagram?

Discussion in 'Early CJ5 and CJ6 Tech' started by brandon11130, Jun 26, 2007.

  1. Jun 26, 2007
    brandon11130

    brandon11130 Master ghetto fabricator

    bethlehem PA
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    i just bought a new 2g carb with auto choke, i was wondering what is the proper way to hook up all the vaccum lines and such. anyone have any pictures??
     
  2. Jun 26, 2007
    wrenchbender1

    wrenchbender1 New Member

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    The line that goes to the vacuum advance on the distributor plugs into the front of the carb, passenger side. The pcv plugs into the rear of the carb, and IIRC the heater stuff goes to the intake manifold.
     
  3. Jun 27, 2007
    brandon11130

    brandon11130 Master ghetto fabricator

    bethlehem PA
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    then where should i get the vaccum for the vaccum choke? off the ccv? just buy a t fitting?
     
  4. Jun 27, 2007
    sparky

    sparky done Staff Member Founder

    Toowoomba, QLD
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    Vacuum choke? On a V6?

    What carburetor do you have on there?

    Wrenchbender is right, for a stock engine. Sounds like yours is not.

    BTW, I have no idea where a vacuum choke would connect. Never worked with one. Only worked with mechanical, hot air, and electrical.
     
    Last edited: Jun 27, 2007
  5. Jun 27, 2007
    brandon11130

    brandon11130 Master ghetto fabricator

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    yep, i bought a remanufactured 2g with an autochoke, it was supposed to be for a 71 jeepster commando. but i figured it would work on mine since its the same engine. maby its not vaccum, i dont know what it is, its not electric so maby it does go off hot air?? i dont know. any ideas?
     
  6. Jun 27, 2007
    lamar

    lamar Member

    greenville sc
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    it draws hot air from the passenger side exhaust manifold to operate the choke.most commandos had a fitting on the exhaust manifold that a metal tube attached to and ran up to the choke on the carb.
     
  7. Jun 28, 2007
    grannyscj

    grannyscj Headed to the Yukon

    Anchorage, AK
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    The CJs used the same exhaust manifold. If your's is still stock it should have a tube protruding from the underside of the passenger exhaust manifold. I believe they used a hard plastic tube from there to the choke. Other than that you should just need 12V power to it and adjustment.:v6:
     
  8. Jun 28, 2007
    sparky

    sparky done Staff Member Founder

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    Commandos used a metal tube to the carb and it's just a hot air choke, not an electric or vacuum choke. You could easily bend the tubing yourself with a cheap tube bender for brake lines, fuel line, etc.

    I just readjusted one last Sunday on a '71 Jeepster. :beer:
     
  9. Jun 28, 2007
    timgr

    timgr Eppur si muove. 2021 Sponsor 2020 Sponsor

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    Just to clarify, there has to be a little vacuum on a thermal or thermoelectric choke. There's a passage to manifold vacuum in the carburetor that lowers the pressure under the choke cover, and that draws the heated air in from the choke stove.

    Of course, the 2G could do this differently from every other carb I'm familiar with, but I don't think so.

    <edit> Also, the "Help" line sells a thermo/thermoelectric choke stove repair kit, that will provide everything you need to feed hot air to the automatic choke.
     
    Last edited: Jun 28, 2007
  10. Jun 28, 2007
    beeser

    beeser Member

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  11. Jun 28, 2007
    timgr

    timgr Eppur si muove. 2021 Sponsor 2020 Sponsor

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    Most do. Should be glass fiber, or the A-word.
     
  12. Jun 28, 2007
    beeser

    beeser Member

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    Why so Tim? Wouldn't there be enough pressure from the exhaust to force heated air to the choke?
     
  13. Jun 28, 2007
    timgr

    timgr Eppur si muove. 2021 Sponsor 2020 Sponsor

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    No, there's no connection to the exhaust. It uses only outside air. If you look at the choke stove, it's a blind pocket in the manifold.
     
  14. Jun 28, 2007
    beeser

    beeser Member

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    That's what I originally thought but after checking at least two manifolds there is definitely a breach in the tubing inside the manifold, at least with those tested. We had a discussion about plugging the ends of the tubing here before.
     
  15. Jun 28, 2007
    timgr

    timgr Eppur si muove. 2021 Sponsor 2020 Sponsor

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    Doubtful. Every other carb I've seen has a hot air stove, not an exhaust connection. Clean, filtered air. Exhaust gas is corrosive, and sending it into the choke housing seems a very unlikely design choice.

    Have you actually seen exhaust gas coming out of this hole, on a running engine? This too seems to me to be a very unlikely design choice - an exhaust leak almost guaranteed.
     
  16. Jun 28, 2007
    sparky

    sparky done Staff Member Founder

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    :iagree:
     
  17. Jun 28, 2007
    beeser

    beeser Member

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    Yes. Again, we talked about this before as others have experienced the same thing.
     
  18. Jun 28, 2007
    beeser

    beeser Member

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    Last time I'll try to contribute something from memory. Just checked a spare manifold and the tube is completely sealed inside. However, the one on my Jeep does leak exhaust gas, which is why I went through the trouble of trying to seal it. Enough of my stupid input for the day.
     
  19. Jun 28, 2007
    brandon11130

    brandon11130 Master ghetto fabricator

    bethlehem PA
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    im running heders on my v6, anyone have any other ideas on how i can hook it up?
     

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