Which is better Heli coil or Larger Bolt

Discussion in 'Other Service and Maintenance' started by dangerdan, Feb 21, 2010.

  1. dangerdan

    dangerdan Junior Member

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    I managed to strip 2 of the holes in the primary cover that hold the primary cover inspection plate . I did use a torque wrentch with the correct settings.
    I believe the previous owner had a tendancy to overtighten causing the aluminum to break down.

    Am I better off to re-tap all holes with a larger bolt and finer thread or replace all holes with Heli coils.
     
  2. Chopper

    Chopper Senior Member

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    Heli coils will work find, have used them before, not that I have ever over torqued anything:) I would not want to have to look at a bigger bolt in one or two holes.
     
  3. dangerdan

    dangerdan Junior Member

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    Never used them b4 , but that brings more quetions as to the type used and what type of loctite to use
     
  4. DavesKystoms

    DavesKystoms Member

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    A heli coil will be a better fix than going bigger. If you just go to a bigger bolt you will still be useing a steel bolt in aluminum threads, heli coil will last alot longer than aluminum threads.
     
  5. DavesKystoms

    DavesKystoms Member

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    You can use red thread locker or green sleeve retainer on the outside of the heli coil. just be sure the let them sit for an hr or two before putting the bolt in, if you put the bolt in right away you might lock the bolt aswell.
     
  6. dangerdan

    dangerdan Junior Member

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    Thanks Daves...

    Now for the $64,000.00 question.

    Can I do this without removing the primary cover.
     
  7. dangerdan

    dangerdan Junior Member

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    Thanks for the reply Smitty.

    Nope, never done one before. From what I have read on the internet a tap with a reverse thread is used. My concern was with the metal bits inside the primary when I run this tap.

    I am going to try a few practice holes and if I have any problems I will look at getting this done by a pro.

    Thanks to all who responded
     
  8. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    Heli-coil as long as there is enough "meat" in the primary cover where you are gonna be putting the heli-coil. You have to drill a fairly large diameter (by comparison) hole and tap that to screw the coil into. If it will work, do as has been suggested above, and Lock-tite it in there. Let it set up good before messing with it. And DON'T do this with the cover on. Take it off and do it right.

    TQ
     
  9. Chopper

    Chopper Senior Member

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    I've done them while they were on, if the hole goes all the way through put some heavy grease on your bit before drilling and drill slow, also grease on the tap, the grease will help keep the metal filings from going in the primary case if done right.
    Can't remember but I think the 95 cover has the three hole cover derby cover, this would give me the excuse to upgrade to a 99 cover that has the 5 hole derby that seals better, I would look at the heli coils, tap & drill that I did not have to buy as a discount on brand new chrome cover. Your cups half full not half empty:)
     
  10. dangerdan

    dangerdan Junior Member

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    TQ - I meant to say that I will practice on a SCARP piece of alumimiun. Thanks for your concern