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Helicoil advice on crank snout - I'm a thread too long

Discussion in 'Engine Topic' started by Edem_Alive, Mar 10, 2017.

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  1. Mar 10, 2017 #1
    Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    Hey guys, I drilled, tapped, and installed two helicoils but as you can see the last one is just about 1 rotation too long. Should I attempt to snap it sideways or grind it or..?

    [​IMG]
     
  2. Mar 10, 2017 #2
    CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    By the picture, it appears to be below the flange surface, so I would leave it alone.
     
  3. Mar 10, 2017 #3
    mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    .

    Ditto, if it ain't broke, don't fix it.


    .
     
  4. Mar 10, 2017 #4
    Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    The problem is that I cannot screw in the screw because the helicoil spring pressure is holding it out like that. So I can't get the threads started. Should I try loctite and clamping it into the bottom for a while?
     
  5. Mar 10, 2017 #5
    Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    I see the problem....
    Your crank is too short. :eek:

    Can you grab the tail end off the insert with a needle-nose pliers and twist it back out?
    The installation tool is made for installation.
    A Heli-coil insert tends to bind if you try to back it out from the inside tang using the installation tool.

    If you can back it out... I would trim a full coil off of another insert before attempting to re-install.

    Good luck!
     
  6. Mar 10, 2017 #6
    Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    I had already broken the tang unfortunately. It also has red loctite and sat overnight this way so not sure how easily it would come out.
     
  7. Mar 10, 2017 #7
    70-camaro

    70-camaro Veteran Member

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    Seal every thing needed with masking tape. Run an allen screw in crank. You can buy very small cut off wheel for a die grinder. Maybe even cut it off with a small dia burr.
     
  8. Mar 10, 2017 #8
    Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    ^ Good Answer
    An internal-head allen screw just might get past that extra helicoil thread.

    If you can score the insert with a jeweler's file... You may be able to break off that "extra" thread with an allen screw holding the rest of it in place.
    Removing the allen screw should then flatten any burr which should allow a bolt to thread back into the crank.

    upload_2017-3-10_11-19-41.png

    Good Luck!!!
     
  9. Mar 10, 2017 #9
    Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

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    Sounds like a good plan. I'll try it out. Thanks!
     
  10. Mar 10, 2017 #10
    larrylarry

    larrylarry Veteran Member

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    Use a Dremmel Tool with one of those bits that have diamond dust on them. They'll cut a notch easy.
     
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