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Stripped Flywheel To Crank Bolt Hole

Discussion in 'Intermediate CJ-5/6/7/8' started by DrDanteIII, May 2, 2016.

  1. May 2, 2016
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
    Joined:
    Mar 21, 2007
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    1,516
    Good morning Jeepers.

    AMC 304 circa 1972

    I'm in the process of replacing my clutch and trans.

    When I removed the flywheel bolts, it appears that most of the thread has come along with one of the 6 bolts. While it the hole seems like it can still retain a bolt, I doubt it will allow proper torque values to be applied during reassembly.

    Does anyone know if a helicoil is a potential solution for this?

    What is the bolt size and thread pitch for this flywheel bolts on this jeep?


    Thanks!
     
  2. May 2, 2016
    sterlclan

    sterlclan Member 2022 Sponsor

    exploring the...
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    If you can find a helicoil that is the right size and pitch I don't see why it wouldn't work. No clue as to a bolt size what size socket took it off?
     
  3. May 2, 2016
    dsrt4

    dsrt4 Member

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    Oct 30, 2009
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    Should be 1/2-20 stock. They have helicoils for that size repair and it'll work just fine if you know what you are doing.

    You can drill them all out and go to a larger size bolt as well.
     
    DrDanteIII likes this.
  4. May 2, 2016
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
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    Thanks.
    My subsequent research also points to the bolts being 1/2-20. I'm going to go with the helicoil, since re drilling all the holes and flywheel correspondingly seems like a recipe for disaster.
     
    sterlclan likes this.
  5. May 2, 2016
    tarry99

    tarry99 Member

    Northern California
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    3,784
    I assume the engine is still in the vehicle?.............If so you'll only get one shot at getting the hole drilled in straight the first time.
    If you have a little fixture that can help you align it , that helps.........for 1/2"x 20 my HeliCoil kit says use a 33/64" drill..........take it slow with some lube as the crank will have been heat-treated ..........it's not super hard but just the same it's not mild steel either.
     
  6. May 2, 2016
    sterlclan

    sterlclan Member 2022 Sponsor

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    the kit should have the bit and installation tool,at least at my flaps they do.
     
  7. May 2, 2016
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
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    Nov 5, 2014
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    589
    Install the flywheel with a couple bolts to use as a guide if the proper drill bit will fit through it.
     
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  8. May 3, 2016
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
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    Thats the plan.

    The kit has everything I need except for the drill bit, which I also bought.

    Thanks for the input. I'll let you know how it goes.
     
  9. May 3, 2016
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
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    4,170
    A helicoil or equivalent will be your answer.
    You can use the flywheel as a "base" to better get a hole drilled at 90 degrees. There are some inexpensive fixtures that attach to drills, or consider renting a drill with a magnetic base that could be used off the flywheel surface. As Tarry99 said, you only get one chance to get the hole right.
    Take your time, and it will turn out fine.
    -Donny
     
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