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Projects Stripped carb screw

Discussion in 'Traditional Hot Rods' started by USMC67, Apr 20, 2020.

  1. USMC67
    Joined: Aug 5, 2017
    Posts: 4

    USMC67

    I'VE GOT A 94 CARB THAT HAS A STRIPPED LARGE THROTTLE BODY SCREW...THE 1/4 x 28 . WHAT'S THE BEST WAY TO REPAIR IT?
     
  2. greybeard360
    Joined: Feb 28, 2008
    Posts: 1,457

    greybeard360
    Member

  3. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,066

    Atwater Mike
    ALLIANCE MEMBER

    Yes, Helicoil, in standard font.
    Semper Fi.
     
    deadbeat likes this.
  4. dana barlow
    Joined: May 30, 2006
    Posts: 3,883

    dana barlow
    Member
    from Miami Fla.
    1. Y-blocks

    These times if you can't find H-coil.
    Farmer fix is; clean hole out ,JB weld {or Epox}a stud in hole let dry 2 days,then put back together with a nut an lock washer
     
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  5. brigrat
    Joined: Nov 9, 2007
    Posts: 5,153

    brigrat
    Member
    from Wa.St.

    Farmer fix is a next size metric if you can stand anything metric on your rod!
     
    Johnny Gee and deadbeat like this.
  6. Dana knows,,,,,he’s been in this game for some time .

    And I don’t know any farmer that likes metric ,,,,LoL.


    Tommy
     
  7. Zuffen
    Joined: May 3, 2013
    Posts: 99

    Zuffen
    Member
    from Sydney
    1. COE's (Cab Over Engine)

    90% of the World's Farmers use Metric threads on everything they own.
    Of course they live outside the USA. The only country of any note still using the Imperial system.
     
    Rckt98, G-son and X38 like this.
  8. G-son
    Joined: Dec 19, 2012
    Posts: 633

    G-son
    Member
    from Sweden

    I generally want to take a closer look at things before I decide how to fix them. Sure, helicoils are great in many cases, but they can also be completely unsuitable in other places. For example, you don't want them in spark plug holes, as they may stick to the plug while being screwed in, and get pushed far into the combustion chamber without you knowing.
     
  9. F-ONE
    Joined: Mar 27, 2008
    Posts: 2,096

    F-ONE
    Member
    from Alabama

    The first thing to try is to simply and carefully re-tap it with the 1/4 x 28 thread.

    Sometimes this works for low load screws where the threads may be damaged instead of completely gone.

    The tap can restore the thread height by swaging the damaged threads back up to where they will hold. On the other hand, if thread damage is severe and the tap starts....”off thread” you’ll end up with a very smooth hole.

    There’s other things you can do but ‘94 cores are rather common.
     
  10. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,035

    theHIGHLANDER
    Member

    I like the JB Weld idea too. I tend to wax up a bolt, fill the hole/threads as needed, get the bolt in and don't monkey with it til the next day. Unscrew the waxed bolt and get back at it like it never happened. there's other "liquid metal" repair mediums out there too that are really tough. As to why fix, well the one you have might be better than what you find. And FWIW,

    WE'RE ALL BORED AND LIKE A HAPPY ENDING. TELL US HOW YOU FIXED IT WHEN YOU DO.

    I typed it that way so you know I was paying attention :cool:
     
    Desoto291Hemi likes this.
  11. carbking
    Joined: Dec 20, 2008
    Posts: 2,783

    carbking
    Member

    While a heli-coil will work in this instance.................

    Unless this is one very rare Holley 94 that I never heard of, or one that extensive racing modifications have been made to, just throw it away, and start with another. Much cheaper than buying the heli-coil tool.

    If you already have the heli-coil tool, then its 50-50 whether the paragraph above still applies.

    Not going to argue the J. B. Weld, but I have yet to fix ANYTHING with this stuff that stayed fixed over 6 months. At my age, fix it once, and forget it; every 6 months (or less) doesn't cut it.

    Jon.
     
  12. KenC
    Joined: Sep 14, 2006
    Posts: 403

    KenC
    Member

    I've used this stuff on some smaller screw holes and it worked OK.
    Loctite Form-A-Thread Stripped Thread Repair Kit 236382
    Not as strong as Helicoil, IMO, but may be strong enough for the carb.
     
  13. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,066

    Atwater Mike
    ALLIANCE MEMBER

    IF you decide to 'pour & fix', there is an aluminum epoxy that machinists use.
    This stuff is infallible, can be drilled, tapped, and is harder than aluminum.
    DEVCON 'aluminum putty'...#10610.
    I bought an aluminum intake for one of my SBCs, it had 3 tapped holes that were so damaged I couldn't heli arc them, (wasn't 'secure' in trying!)
    My machinist son gave me this product, said they use it to repair errors on production parts that have hours of 'events' (production machining) too costly to reproduce.
    I tried it...Holy Moley! Not a 'believer' in JB Weld, glues, or other 'self-hardeners', I was a hard sell...'til I tried it. Miracle stuff. And they understate it as 'putty'!
    I filled the holes per instructions, then Vixen (blade) filed it flat. Drilled just like the parent material! Tapped smoothly, I was amazed.
    Thank you, Sonny.
     
    270ci and koolbeans like this.
  14. The only country of any note still using the Imperial system !

    Yeah,,,you’re right,,,,I guess we are kind of backwards over here .
    But,,,,,,no matter where it is ,,,,,when someone needs help,,,,who do they look to .

    Right here !

    Tommy
     
    mkubacak likes this.
  15. koolbeans
    Joined: Apr 12, 2015
    Posts: 494

    koolbeans

    Devcon is the answer. But,
    also a nutsert/ezlock...a threaded sleeve....drill oversize...of course if there is enough base metal....tap accordingly.....screw in nutsert/ezlock sleeve sized to the original thread size....this is the penultimate if there is enough base metal. Done this many times in aluminum head holes for rocker stands. The process makes the hole / threads more better than original.

    Sent from my XT1710-02 using The H.A.M.B. mobile app
     
    Atwater Mike, 270ci and Desoto291Hemi like this.
  16. USMC67
    Joined: Aug 5, 2017
    Posts: 4

    USMC67

    Right now the Devcon seems like the permanent fix. I have a helicoil set but I want it to last, so...! As I'm sure most of you know that this screw is the only one that inserts from the bottom of the front of the triangular throttle body into the float bowl of the main body. I just spent a couple weeks rebuilding this baby so I won't throw it out and get another one. I'm not a farmer anymore, but I don't think the old farmer would put a nut into the float bowl! Well maybe the farmer of the day would. These new ones would just throw it away and buy a new one!! Thanks to all you guys for the assist and I will get back to you with the fix if I can find some Devcon on Google or Amazon. Thanks again.[​IMG][​IMG][​IMG]
     

    Attached Files:

  17. G-son
    Joined: Dec 19, 2012
    Posts: 633

    G-son
    Member
    from Sweden

    The kits are expensive, but the inserts can be bought separately and don't cost much. Using Devcon will probably cost you at least as much as the insert.
    If you already spent weeks rebuilding it, at least I would for sure use a one dollar insert to make a proper repair here too.
     

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