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Carb Bolts

Discussion in 'Early CJ5 and CJ6 Tech' started by AKCJ, Oct 31, 2006.

  1. Oct 31, 2006
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,035
    Finally took off the carb for a rebuild - it's been on there for more than 10 years.

    The front drivers side bolt busted. Tried vise grips, PB Blaster, and heat with propane torch. Finally had to drill it and use an extractor. Note that the square extractors work better than the spiral type.

    Three of the bolts are 5/16" and one is 3/8". Both front bolts are necked down a bit below the head. Why? The one that broke did so at the narrow part.

    The bottom of the base plate is recessed to make a passage between the two small holes outboard of the main bores on the intake manifold. What's the purpose?

    Do I need to find new specialty bolts or can I just use regular bolts?
     
    AKCJ, Oct 31, 2006
    #1
  2. Oct 31, 2006
    dauntless_powered

    dauntless_powered SUB COB 2024 Sponsor

    Groton, CT
    Joined:
    Nov 3, 2003
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    1,000,080
    hmmmmm just checked and my bolts ae the same way...i currently have mine apart too.... i dunno....someone here will have the answer
     
    dauntless_powered, Oct 31, 2006
    #2
  3. Oct 31, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
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    9,221
    Exhaust gasses are corrosive, that's why they break off. The passage warms the carburetor with exhaust gas.

    I replaced mine with stainless. Sounds like one already broke off and was retapped and replaced.
     
    sparky, Oct 31, 2006
    #3
  4. Oct 31, 2006
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
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    So you're saying that it's not a special bolt that is necked down to allow room for the air to get by?

    And, you're saying that it's exhaust gases going up through intake manifold and under the carb?
     
    AKCJ, Oct 31, 2006
    #4
  5. Oct 31, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Sep 20, 2002
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    No, like I said, exhaust gasses are corrosive, just use stainless in there. :)
     
    sparky, Oct 31, 2006
    #5
  6. Oct 31, 2006
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
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    Ok, got it on the bolt.

    I'm still curious - how does the exhaust get from the outboard side of the heads (where the headers attach) to the top of the intake manifold? There must be a passage through the heads?
     
    AKCJ, Oct 31, 2006
    #6
  7. Oct 31, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Sep 20, 2002
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    Through the head just like you said. :)
     
    sparky, Oct 31, 2006
    #7
  8. Oct 31, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Sep 22, 2002
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    There is a passage thru the exhaust port that goes thru the manifold from one side to the other side passing thru the bottom of the carb. You can also get a carb gasket that blocks this, I did. Use Stainles bolts, coat them with anti seize and forget about the corroded bolts.
     
    Mcruff, Oct 31, 2006
    #8
  9. Oct 31, 2006
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
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    Thanks guys.
    I feel smarter knowing this.
     
    AKCJ, Oct 31, 2006
    #9
  10. Oct 31, 2006
    spize909

    spize909 '65 Tux........SOLD

    Upland CA
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    Feb 26, 2006
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    My manifold is at the machine shop right now. The 2 front bolts were rusted so bad they spun right off with almost no effort. What's left in the manifold looks to be almost "welded".
    I will reinstall with stainless bolts!
     
    spize909, Oct 31, 2006
    #10
  11. Oct 31, 2006
    Vanguard

    Vanguard Take Off! Staff Member

    Vista, CA USA
    Joined:
    Aug 30, 2006
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    As McRuff stated earlier a Victor Reinz gasket G7327 can be used to block off those ports. The P/N is from Car Quest but worked at NAPA as well.
     
    Vanguard, Oct 31, 2006
    #11
  12. Oct 31, 2006
    Executioner

    Executioner Member

    Reading,Pa, USA
    Joined:
    Aug 19, 2006
    Messages:
    347
    Just a suggestion.. use the copper colored high temp neversieze.
    Also a few tricks on bolt removal.. spray with wd40 let sit for 5 min. then use pvc cleaner and dab that around the stuck bolt and let sit for another 5. The reasoning is the wd works in good but the pvc cleaner being a solvent and much thinner will wick inbtween the threads and dissolve and carry the wd40 with it. Then using vice grips, extractor or whatever the problem warrants will be MUCH easier! I've used this method on exhaust manifold bolts that the heads are almost non existent and works very well.
     
    Executioner, Oct 31, 2006
    #12
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