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  1. #1
    Tedcfitz's Avatar
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    Pump shoe thread failure - is this common?

    Hey conversion builders! I need some help here. Some slivers of female threads from the pump intake duct have come out in the threads of the male bolt that holds the intake grate to the shoe. I cannot rethread the bolt back to the shoe. There is nothing for the bolt to grab.

    This happened today when I tried to change the intake grate. I may have overtorqued but I don't think so. Does this mean that the high stress of the conversion ripped the threads? I have the high strength stainless bolts, but I never thought about the threads in the shoe.

    Is this a common failure? What are my options to fix?

    I appreciate your feedback and advice. Thank you!


  2. #2
    Moderator beerdart's Avatar
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    Have you taped and up-sized to M8 as recommended.

  3. #3
    Tedcfitz's Avatar
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    Yes - has M8 bolts currently.

  4. #4
    Autosport's Avatar
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    Pump shoe thread failure - is this common?

    What about using a time sert?

  5. #5
    Duke's Avatar
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    Using an M8 and drilled/tapped further into shoe will be all you ever need. If you pulled threads out it would be my guess that the bolt bottomed out or tap was too loose.

  6. #6
    Happily Self-Employed WFO's Avatar
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    I stopped just drilling and taping them a while back, and put a M8 SS thread insert in now

    I had a couple strip on me when torquing.

    The aluminum they make the shoes out of is crap

  7. #7
    Tedcfitz's Avatar
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    How do I do that?
    Quote Originally Posted by Autosport View Post
    What about using a time sert?

  8. #8
    Tedcfitz's Avatar
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    Where do I get a thread insert? Would you mind sharing how you did that?
    Quote Originally Posted by WFO View Post
    I stopped just drilling and taping them a while back, and put a M8 SS thread insert in now

    I had a couple strip on me when torquing.

    The aluminum they make the shoes out of is crap

  9. #9
    Happily Self-Employed WFO's Avatar
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    Timesert is a thread insert... kinda pricey for the kits tho

    or you can go get a helicoil kit at most autoparts stores (some carry permacoil kit)

  10. #10
    Autosport's Avatar
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    Pump shoe thread failure - is this common?

    Google timesert, plenty of YouTube video on how to use them

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