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Thread: Manifold Nipple Repair Plan

  1. #11
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    Dec 2014
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    Quote Originally Posted by larry View Post
    The nipples were new and not drilled.
    Sure, but the threads don't seal, the lip does, right? How did you seal the hole in your head the factory drilled to rivet it initially?

  2. #12
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    Don't tap it for a set-screw, Gov!

    That just enlarges the hole, and adds stress-risers for cracks.

    (Not to mention knarfing the nipple threads so they tear their way back out.)

    ....Cotten
    Last edited by T. Cotten; 07-26-2019 at 01:00 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  3. #13
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    Quote Originally Posted by T. Cotten View Post
    Don't tap it for a set-screw, Gov!

    That just enlarges the hole, and adds stress-risers for cracks.

    (Not to mention knarfing the nipple threads so they tear their way back out.)

    ....Cotten
    Agree. Enlarging that hole is not on my list of things to do. If Larry got his to seal dry, I may do the same and simply put a little plug of RTV or JB in place... if the fuel eats it, it takes two seconds to re-do. If it pressure tests OK, great! If not, well, then I am in the same spot I'm in now.
    Last edited by govmule84; 07-26-2019 at 01:10 PM.

  4. #14
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    OK, a dry install didn't work. Cleaned up the threads and both mating surfaces, had a small blister of bubbles when under pressure.

    Had to weld an old nut onto the insert to get it out, so now I gotta order another nipple and give it another go.

    I have a copper sealing ring from a common turbo I may try next, but I'm not sure if doing just one nipple will affect the manifold lineup. I may also J-B Weld and see if that does any better.

  5. #15
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    I put them in and out with an expanding collet, Gov!

    ....Cotten
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    Last edited by T. Cotten; 07-28-2019 at 02:55 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  6. #16
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    I did something similar, but it doesn't allow for removals so easily.


  7. #17
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    Seattle
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    Cotten, Did you make that and how can I get one?

    Quote Originally Posted by T. Cotten View Post
    I put them in and out with an expanding collet, Gov!

    ....Cotten

  8. #18
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    Quote Originally Posted by sny View Post
    Cotten, Did you make that and how can I get one?
    Yes, I made them, Sny!

    I started with expanding tool collets from Caterpillar surplus, which may now be unobtainium.

    Then I cut and welded a cone to the center bolt for the large-port tool, and found a convenient countersunk Caterpillar bolt for the small-port.

    Gotta be resourceful.

    ....Cotten
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    Last edited by T. Cotten; 07-29-2019 at 10:33 AM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  9. #19
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    Dec 2014
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    Just got off the phone with Gasoila. They make a product called E-seal: https://www.gasoila.com/products/pip...d-sealant.html

    The tech there sounded very knowledgeable, and was European. He said normally connections there are not tapered thread but straight thread, and they sell a lot of this stuff there.

    I think this is going to be next on my list to try as it is soft-setting. I feel like if I use the JB and it doesn't seal up, I am gonna have a LOT of cleanup work to do.

    Here goes nothin'...

  10. #20
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    Dec 2014
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    I just had another idea. Those copper gaskets I have are a little on the thick side. I don't have a lathe, but I am gonna see if a friend with one can chuck up the nipple and take a corresponding amount off the back of the nipple to so as to not affect the manifold. Add some E-seal, and see how that does.

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