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Repairing the front of a threaded hole 200

posted by  6 volvos in the driveway on  Thu Apr 14 19:35 CST 2005
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While doing some work, somehow the first 1-2 lines of thread in the front of a hole got mashed and wacky. 95% of the bolt hole is fine, and intact. The stock bolt doesn't go in all the way through the threaded area, maybe uses 60% of it, so to keep the same strength of bolt, we will just use a longer one in its place.

What is the proper method to clean the begining threads, without redoing the entire hole? Would you first use a ream to cut the bad threads out, then use a tap? How hard is it to "connect" with the good threads again with the tap, without starting a cross thread. This hole is not easily drill and fully retapped, so that is out of the question for now.








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    Repairing the front of a threaded hole 200

    posted by  someone claiming to be Skip on  Fri Apr 15 05:39 CST 2005 [RELATED]

    Pick up a thread cleaner or thread chaser, as we called them. Basically a device like a tap with a taper that allows the front to be inserted beyond the damaged threads. If the damage isn't too bad, the tip of the device will grab the threads deeper in the hole and pull the rest of the tool in. Got my set at Sears.

    Skip
    '93 850GLT
    '83 242TI Flathood








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      Repairing the front of a threaded hole 200

      posted by  Sumerduckman on  Fri Apr 15 11:09 CST 2005
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      last visit: Tue Aug 21 11:31 CST 2007
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      They ( Sears)call it a thread restorer kit, part #952105. Saved my behooten a number of times.
      --
      Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k








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    Repairing the front of a threaded hole 200

    posted by  TONY H on  Fri Apr 15 05:10 CST 2005
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    last visit: Fri Oct 17 16:39 CST 2014
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    For now I would try and just run the Tap down the hole.
    slightly turn the Tap counterclockwise until it feels like it dropped into the threads correctly then go clockwise. With a lite touch you will know if you are cross threading or not.

    If you drill a bit larger in the front of the threads, i think you will be in more trouble.
    --
    '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me








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    Repairing the front of a threaded hole 200

    posted by  Mech65 on  Fri Apr 15 03:20 CST 2005
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    last visit: Wed Oct 22 09:24 CST 2014
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    What is the bolt holding in place? Are there other bolts holding part on or is this the only one?

    If there are other bolts holding the part on I would just clean the treads up the best you can with the proper tap and leave it. The problem with reaming out the treads and attempting to re-tap is, There will not be any material to cut new treads.

    The proper procedure would be to drill a bigger hole and re-tap it.

    Other option

    Heli coil, this can be a serious PITA.

    Good luck!







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    Repairing the front of a threaded hole 200

    posted by  Mark Lundell on  Fri Apr 15 01:18 CST 2005
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    last visit: Sun Sep 14 21:34 CST 2014
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    This may apply depending on the location of the bolt. If the bolt hole goes all the way through, it may be possible to rethread from the back of the hole. I think I had this circumstance once.







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