What's the secret? AN fitting Q
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What's the secret? AN fitting Q

  1. #1
    Senior Member H20MOFO's Avatar
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    Default What's the secret? AN fitting Q

    I dunno, I don't really consider myself anal, but I'm not diggin how all of my fittings are sticking way out of everything on the npt side. I thought over on HB Superdave told someone he fixes that with a tap??? While were on the subject, how do I know if the braided stuff I'm running is fuel compatable, after that one post saying most were not, I've been wondering ever sense.
    Another Hot Boat refugee

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  3. #2
    Senior Member BA Kurtis's Avatar
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    Not sure on the ntp threads, never had a problem with that or maybe I never noticed. I have used sweet performance braided line (rubber) for fuel for years with out any trouble. Now I am going to have to go look at my fittings ntp

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    Really Big Member SilverEagle's Avatar
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    In places where it shows, I sometimes use a carefully cut piece of SS tubing slipped over the threaded part of the NPT part of the AN fitting. I have found that there is usually at least 1/4 turn of adjustment between where the fitting will seal and where it won't turn any more without risking cracking something. You want to cut the tubing off at the right length so that the AN fitting snugs the tubing down (so it won't rattle) and is tight enough to seal. I use a cut-off band saw to get the angle as square as possible. If it needs to be trimmed, I use the milling machine to trim it, but a lathe would work just as well.

    Depending on where the fitting goes, you may also be able to use the "hog the threads out" technique. I only do that if I can clean out the shavings on the back side after using the tap. If there is room, a SS washer looks nice under the hex part of the fitting. Just be careful you don't go too deep!
    What, me worry?Ó¿Ò

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    "The" masheenist wsuwrhr's Avatar
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    I don't know why, but AN fittings always seemed to be bigger than their brass counterparts. Maybe SD can chime in with the reason why this is so. I never had the correct drawing standards to know for sure, but I assume this is why.

    But I can tell you that I ALWAYS tap the pipe thread deeper by a turn/turn and a half or so on anything I used, machined, or put together that was destined to have an AN fitting installed.

    I hated it just like you do.


    Brian
    Last edited by wsuwrhr; 11-26-2008 at 06:21 PM.
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    "The" masheenist wsuwrhr's Avatar
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    Hard lessions to learn for sure.

    Quote Originally Posted by SilverEagle View Post
    I have found that there is usually at least 1/4 turn of adjustment between where the fitting will seal and where it won't turn any more without risking cracking something.
    SB Products:Inspiring metal to change shape, one chip at a time.
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    Buy American made goods whenever you can, the job you save may be your own.


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    Senior Member H20MOFO's Avatar
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    You'll prolly all laugph but I didn't realize taps got wider as they went, other than the inital, really obvious taper. I'll go give her a shot.
    Another Hot Boat refugee

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    "The" masheenist wsuwrhr's Avatar
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    Quote Originally Posted by H20MOFO View Post
    You'll prolly all laugph but I didn't realize taps got wider as they went, other than the inital, really obvious taper. I'll go give her a shot.

    It's all good.

    It is real easy to go from too shallow to too deep in a hurry.

    Try a half turn at a time until you get where you want to be.

    Brian
    SB Products:Inspiring metal to change shape, one chip at a time.
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    "The" masheenist wsuwrhr's Avatar
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    Also auto's (especially transmissions) sometimes have a "straight pipe" thread, which has only a small degree of taper compared to a "taper pipe thread". I have no idea why this is , but it is what it is.

    So just be careful.

    Brian
    SB Products:Inspiring metal to change shape, one chip at a time.
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    The United States, the new and improved Roman Empire.
    Buy American made goods whenever you can, the job you save may be your own.


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    Senior Member H20MOFO's Avatar
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    Umm ...anyway to take it off the fitting instead? Long story short I don't think the tap deal is an option here.
    Another Hot Boat refugee

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    "The" masheenist wsuwrhr's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Umm ...anyway to take it off the fitting instead? Long story short I don't think the tap deal is an option here.

    Why?

    You have plenty of room

    Dont be scared



    Brian
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  13. #11
    "The" masheenist wsuwrhr's Avatar
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    "Take it off the fitting"

    If you are suggesting shortening the fitting, that won't work anyway. Won't do you any good.
    SB Products:Inspiring metal to change shape, one chip at a time.
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  14. #12
    "The" masheenist wsuwrhr's Avatar
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    Where the hell are you at dude?

    Bring that thing by my shop, I will fix it for you in ten minutes.
    SB Products:Inspiring metal to change shape, one chip at a time.
    Good labor isn't cheap, cheap labor isn't good.
    The United States, the new and improved Roman Empire.
    Buy American made goods whenever you can, the job you save may be your own.


  15. #13
    Senior Member H20MOFO's Avatar
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    O.K I'll give it a shot(I thought I had that tap but I don't), I hope lowes is open on thanksgiving.lol It's hard to see in the photo.... but the hole that you are lookin at(nearest in the photo) isn't lined up with the ....hole in the front of the fitting. Hopefully I dont need to go past that. I hope that made some sense.. Thanks for the help BTW.
    Last edited by H20MOFO; 11-26-2008 at 07:35 PM.
    Another Hot Boat refugee

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    "The" masheenist wsuwrhr's Avatar
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    Quote Originally Posted by H20MOFO View Post
    O.K I'll give it a shot, I hope lowes is open on thanksgiving.lol It's hard to see in the photo.... but the hole that you are lookin at isn't lined up with the ....hole in the front of the fitting. Hopefully I dont need to go past that. Thanks for the help BTW.
    You're welcome.

    So what? Just run a drill thru the hole.

    Looks like you have plenty of material all around the port opening.

    I'll be at the shop Friday too.

    Brian
    Last edited by wsuwrhr; 11-26-2008 at 07:37 PM.
    SB Products:Inspiring metal to change shape, one chip at a time.
    Good labor isn't cheap, cheap labor isn't good.
    The United States, the new and improved Roman Empire.
    Buy American made goods whenever you can, the job you save may be your own.


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