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Thread: Bad Heli-coil Repair, how do I fix?

  1. #1
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Bad Heli-coil Repair, how do I fix?

    My customer just brought in a set of premium Dart heads but one exhaust thread is a heli-coil - but it will not thread.
    1. Do I try to tap it 3/8-16 and Loctite in a stud?
    2. Or, can I remove the coil and start over?
    Thanks, Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  2. #2
    Senior Member DYNO OPERATOR
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    If it already has a Heli-coil the hole will be too big for a 3/8-16 tap. There is a product called a Keen-sert. It's kinda like a threaded bushing. See the video... Hope this helps.

    http://www.youtube.com/watch?v=XyCTh23Z6o0

    TS1955

  3. #3
    Senior Member DYNO OPERATOR
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    Bad

    If the helicoil is damaged, you may be able to use an EZ OUT to remove it and just put another Helicoil back in. Be sure to break off the tag at the bottom of the old Helicoil before inserting the EZ OUT if it is still there.

    The KEEN SERTS are good too if there is enough material around the hole to let you go bigger.

  4. #4
    Senior Member EXPERT BUILDER gearhead1011's Avatar
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    Don't try to tap a heli-coil. The tap will jam and possibly break. You can just take a sharp pick and bend the top of the coil in and then remove with needle nose pliers. Then you can clean up the threads with the heli-coli tap and install a new heli-coil. If it's too far gone for that then use the keensert.

  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by gearhead1011
    Don't try to tap a heli-coil. The tap will jam and possibly break. You can just take a sharp pick and bend the top of the coil in and then remove with needle nose pliers. Then you can clean up the threads with the heli-coli tap and install a new heli-coil. If it's too far gone for that then use the keensert.
    yes..... X2 :wink:
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  6. #6
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Thanks for your response. I'll work on it today and let you know.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  7. #7
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Problem solved. The shadetree mechanic drilled the hole crooked (probably by hand) and trying to tighten the header, it stripped the new insert.
    The only tools some mechanics should use is a wheelbarrow.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by oldandtired
    Problem solved. The shadetree mechanic drilled the hole crooked (probably by hand) and trying to tighten the header, it stripped the new insert.
    The only tools some mechanics should use is a wheelbarrow.
    lol... i hear ya :lol:
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
    http://img.photobucket.com/albums/v2...lastscan-3.jpg


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