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038 mag stripped case bolts

Discussion in 'Chainsaw' started by Okie294life, Mar 26, 2019.

  1. Okie294life

    Okie294life Small engine jackwagen.

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    i just got a call from the dealer telling me that one of my case bolts is stripped, one for the cylinder head. Anyone have success repairing these, I tried blue loctite and they still keep backing out. Should I try going back with a 6mm bolt and tapping the hole, or going back with red loctite? The bolt holds down and torques it just backs out when the eingine is running.
     
  2. rocketnorton

    rocketnorton Addicted to ArboristSite

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    tap it out a size bigger'd be what i'd try first.
    unlikely red will hold either if blue didnt.
     
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  3. lone wolf

    lone wolf MS 200T King

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    Timeserts https://www.belmetric.com/time-sert-thread-repair-c-217/
     
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  4. MontanaTed

    MontanaTed Addict

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  5. Okie294life

    Okie294life Small engine jackwagen.

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  6. grizz55chev

    grizz55chev Tree Freak

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    Just go with the 6 mm and red loctite.
     
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  7. pioneerguy600

    pioneerguy600 Lost in Space Staff Member

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    There is a proper install kit= costly, check it out,Google search.
     
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  8. lone wolf

    lone wolf MS 200T King

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    They work real well.
     
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  9. lone wolf

    lone wolf MS 200T King

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    The kit supplies the tap and all you need but the locktite.
     
  10. lone wolf

    lone wolf MS 200T King

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    Better!
     
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  11. MontanaTed

    MontanaTed Addict

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    Nice, never realized they had these types of kits. I have used helicoils before but haven’t seen this kit. Great.

    Hope the OP can use these successfully.
     
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  12. pioneerguy600

    pioneerguy600 Lost in Space Staff Member

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    The kits run around $85. for most thread sizes up here but I still buy and use them, just did an 026 PRO cylinder spark plug last weekend. I seal the insert in with the cylinder off the saw and I check for leaks by pulling vac on them before installing back on the crankcase, no leaks so a happy customer.
     
  13. lone wolf

    lone wolf MS 200T King

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    How do you get the spark plug hole tapped exactly correct so it don't leak ?
     
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  14. pioneerguy600

    pioneerguy600 Lost in Space Staff Member

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    Not difficult for any machinist. Index it with a machined rod turned to 14.95 mm on one end, 15 mm on the other end, in the chuck that tightly fits the plug bore, clamp the angle vice tightly to the table of the drill press or end mill with the cylinder clamped tight in it and when everything is aligned correctly change out the indexing rod for the drill bit from the kit being used. Drill and tap, clean the thread in the cylinder head out well with a solvent to remove any oil and contamination, clean insert threads , mix and apply sealer to the threads in the head, thread in insert until flush with the plug seat and let sit until cured. Clear as mud, eh.

    [​IMG]
     
  15. Okie294life

    Okie294life Small engine jackwagen.

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    That’s kinda what I’m thinking I have a 6mm tap, did a handle bolt the other day and it turned out well just didn’t know if it was something that would be suitable to hold down a cylinder head. The dealer says don’t do it, but I don’t see how 1mm of aluminum could make much of a difference if any at all on the case.
     
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  16. grizz55chev

    grizz55chev Tree Freak

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    It works quit well, actually. Done it many times.
     
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  17. Okie294life

    Okie294life Small engine jackwagen.

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    Thanks for the vote of confidence. I’m going to get a 5mm tap and try to clear the threads out, and if that doesn’t work go at it with the 6mm.
     
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  18. lone wolf

    lone wolf MS 200T King

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    Dont do it use the proper Timesert if you start tapping and screw up you got nothing left to work with you cant keep going bigger, do you even know the larger screw will fit in there?
     
  19. grizz55chev

    grizz55chev Tree Freak

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    Correct me if I’m wrong, but don’t you have to drill it oversized to install the Timesert?
     
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  20. lone wolf

    lone wolf MS 200T King

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    Sometimes but its only a tiny fraction larger most the time the holes are so sloppy you don't even have too.
     
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