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Hot Rods boogered up AN aluminum threads on my fuel cell.

Discussion in 'The Hokey Ass Message Board' started by southcross2631, Mar 26, 2020.

  1. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,353

    southcross2631
    Member

    I got a really good deal on fuel cell the other day. It has 2 # 8 AN fittings that have been slightly cross threaded. Where can I find a thread chaser to try and save the fittings.
    worse case scenario I cut the fittings off and weld new one on. don't want to do that because I don't have a tig welder or a spool gun for my mig welder.
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 44,646

    squirrel
    Member

    Male 3/4-16 thread, eh? and you need a die?
     
  3. 48jeep
    Joined: Apr 3, 2009
    Posts: 64

    48jeep
    Member

    If the threads are male threads, you can probably use one of those square sided thread files. Match the thread count up to what the AN fitting uses and file away carefully. The thread count number is stamped on each face of the file.
     
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  4. Dick Stevens
    Joined: Aug 7, 2012
    Posts: 2,721

    Dick Stevens
    Member

    These work great, at work we had a couple of different sizes and they were a life saver many times! They can be used to restore the thread without cutting off material like a die will, by running it backwards and let it reshape the damaged threads or run it to cut like a die would.
     
    Last edited: Mar 26, 2020
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  5. big duece
    Joined: Jul 28, 2008
    Posts: 5,743

    big duece
    Member
    from kansas

    I was always under the impression the tight tolerances that the AN fittings were designed for the aerospace industry and were so much higher quality tooling than hardware grade threads of the same size. Rather than try to "correct" existing threads, may be best to replace the fitting. If the 37* taper is damaged, the best threads won't help.
     
  6. Mr T body
    Joined: Nov 2, 2005
    Posts: 2,101

    Mr T body
    Alliance Vendor
    from SoCal

    I prefer to use jeweler's files for cleaning up boogered threads. Assuming it's a male -8 so shouldn't be a big deal.
     
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  7. Boneyard51
    Joined: Dec 10, 2017
    Posts: 3,555

    Boneyard51
    Member

    Guys, threads are threads! Don’t know how bad your threads are, but I bet they can be rescued! In my tool box I have one drawer marked threading! Taps, dies, thread files, yes they do exist! Triangle files and several universal thread restorers that look like a monkey wrench!
    But I come from a generation that was taught by the greatest generation to FIX, not replace!
    I bet you 23 beers I could restore your threads! I have done it many times on race cars that were cross threaded by youngsters! Just saying! Lol








    Bones
     
  8. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,581

    gimpyshotrods
    Member

    Yup. I'd bet beer that you could file two flats in the threads, 180º apart, to the base of the threads, and it would still seal, so long as the cone is not damaged, and you get the nut on straight.
     
  9. DDDenny
    Joined: Feb 6, 2015
    Posts: 13,093

    DDDenny
    Member
    from oregon

    Every toolbox should have one correct-fit-thread-file.jpg
     
  10. Graham08
    Joined: Oct 2, 2007
    Posts: 118

    Graham08
    Member

    If they're in a tight spot, get one of these. I have a couple in different sizes that have been life savers at one point or another:

    https://www.mcmaster.com/2667a438

    It's a thread repair die. These are intended for repairing threads and aren't as finicky as a thread cutting die for running back over existing threads.
     
  11. thintin
    Joined: Mar 24, 2006
    Posts: 96

    thintin
    Member
    from NEW YORK

    Gotta like Mcmaster - Carr.....always something to get you out of a bind. Maybe still the fastest shipping ever.
     
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  12. onetrickpony
    Joined: Sep 21, 2010
    Posts: 406

    onetrickpony
    Member
    from Texas

    Like Tbody said, a set of jewler's files, about $5 at Harbor Freight, and a bit of patience. Triangle shape works best.
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 44,646

    squirrel
    Member

    Thanks for looking up the die he needs.
     
  14. alchemy
    Joined: Sep 27, 2002
    Posts: 14,912

    alchemy
    ALLIANCE MEMBER

    The OP said he bought a fuel cell. I've never seen a tank or cell with male fittings welded to it. I assumed he was talking about a bung that had messed up internal threads. Maybe he'll stop ghosting us and let us know which he has.
     
  15. big duece
    Joined: Jul 28, 2008
    Posts: 5,743

    big duece
    Member
    from kansas

    Probably like the one from summit, cut them off and get new an8 to pipe thread fitting. Drill, tap, install. SUM-293210_ml.jpeg

    Sent from my SM-G900P using The H.A.M.B. mobile app
     
  16. 32v
    Joined: May 20, 2007
    Posts: 929

    32v
    Member
    from v.i.

    Drill it out and install a an bulkhead fitting
     
  17. DDDenny
    Joined: Feb 6, 2015
    Posts: 13,093

    DDDenny
    Member
    from oregon

    That crossed my mind too!
    Not saying this is the case with @southcross2631 but I sure wish guys would take the time to (at a minimum) educate themselves about components they use on their projects.
    Also, knowing the difference between taps and dies sure would make discussions here go a little smoother.


    https://www.google.com/search?q=alu...VTvJ4KHc6lA4YQ_AUoA3oECAoQAw&biw=1280&bih=752

    Not sure I understood you correctly but the above search does not agree with your statement.
    Just noticed big duece posted the photo I was about to post.


     
  18. big duece
    Joined: Jul 28, 2008
    Posts: 5,743

    big duece
    Member
    from kansas

    If you can get your hand inside to tighten it up... good idea!
    Sent from my SM-G900P using The H.A.M.B. mobile app
     
  19. The thread restoring files that I bought from
    Harbor Freight have saved a lot of threads for me.
     
  20. Mr T body
    Joined: Nov 2, 2005
    Posts: 2,101

    Mr T body
    Alliance Vendor
    from SoCal

    I have one exactly like this in the '32. Actually kind of nice not F'ing with pipe threads, adapters and additional fittings, but remember (especially on these) anti-seize is a necessity!
     
  21. big duece
    Joined: Jul 28, 2008
    Posts: 5,743

    big duece
    Member
    from kansas

    Also, depending on what your fuel requirements are you might want the an10 size...

    Sent from my SM-G900P using The H.A.M.B. mobile app
     
  22. RichFox
    Joined: Dec 3, 2006
    Posts: 9,860

    RichFox
    ALLIANCE MEMBER

    Some guy from 767 O'haul used to bring me a -8 potable water fitting. Stainless with a -8 thread on one end. Threads a little buggered. I used a jewelers 60 degree file and a female fitting with lapping compound to clean up his threads. He kept coming back so I guess it worked.
     
  23. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,353

    southcross2631
    Member

    This is the fuel cell that I have . I will figure it out. DSCF3616.JPG The fittings just won't screw on . I need to cap one and one goes to the fuel pump.
     
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  24. Budget36
    Joined: Nov 29, 2014
    Posts: 3,020

    Budget36
    Member

    Can you put up a blurrier Pic? I can almost make it out...;)
     
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  25. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,353

    southcross2631
    Member

    Yes I will post one up in the morning. :cool:
     
    Budget36 likes this.
  26. bchctybob
    Joined: Sep 18, 2011
    Posts: 1,965

    bchctybob
    ALLIANCE MEMBER

    Sometimes asking a simple question is brutally painful, ain't it southcross?
    I would have suggested the chaser die like the one from McMaster-Carr and totally expect to get flamed about how the AN fittings are close tolerance and you'll f it up with a cheap die even though the active sealing surface is the taper and the threads just have to be good enough to take the proper torque.
    BTW, you're movin' right along on the wagon, lookin' good!
     

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