Helicoil advice on crank snout - I'm a thread too long

Discussion in 'Engine Topic' started by Edem_Alive, Mar 10, 2017.

  1. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

    Messages:
    464
    Likes Received:
    9
    Joined:
    Dec 18, 2015
    Location:
    Montana
    Hey guys, I drilled, tapped, and installed two helicoils but as you can see the last one is just about 1 rotation too long. Should I attempt to snap it sideways or grind it or..?

    [​IMG]
     
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    Messages:
    11,109
    Likes Received:
    789
    Joined:
    Nov 4, 2004
    Location:
    Ringgold, GA
    By the picture, it appears to be below the flange surface, so I would leave it alone.
     
  3. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

    Messages:
    7,821
    Likes Received:
    507
    Joined:
    Apr 12, 2007
    Location:
    Chicago, Illinois..... Far S.W. Subs, RT 66 Area
    .

    Ditto, if it ain't broke, don't fix it.


    .
     
  4. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

    Messages:
    464
    Likes Received:
    9
    Joined:
    Dec 18, 2015
    Location:
    Montana
    The problem is that I cannot screw in the screw because the helicoil spring pressure is holding it out like that. So I can't get the threads started. Should I try loctite and clamping it into the bottom for a while?
     
  5. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

    Messages:
    28,646
    Likes Received:
    1,912
    Joined:
    Feb 26, 2004
    Location:
    Bloomington, MN
    I see the problem....
    Your crank is too short. :eek:

    Can you grab the tail end off the insert with a needle-nose pliers and twist it back out?
    The installation tool is made for installation.
    A Heli-coil insert tends to bind if you try to back it out from the inside tang using the installation tool.

    If you can back it out... I would trim a full coil off of another insert before attempting to re-install.

    Good luck!
     
  6. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

    Messages:
    464
    Likes Received:
    9
    Joined:
    Dec 18, 2015
    Location:
    Montana
    I had already broken the tang unfortunately. It also has red loctite and sat overnight this way so not sure how easily it would come out.
     
  7. 70-camaro

    70-camaro Veteran Member

    Messages:
    3,127
    Likes Received:
    1,332
    Joined:
    Mar 25, 2010
    Location:
    marietta ohio
    Seal every thing needed with masking tape. Run an allen screw in crank. You can buy very small cut off wheel for a die grinder. Maybe even cut it off with a small dia burr.
     
  8. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

    Messages:
    28,646
    Likes Received:
    1,912
    Joined:
    Feb 26, 2004
    Location:
    Bloomington, MN
    ^ Good Answer
    An internal-head allen screw just might get past that extra helicoil thread.

    If you can score the insert with a jeweler's file... You may be able to break off that "extra" thread with an allen screw holding the rest of it in place.
    Removing the allen screw should then flatten any burr which should allow a bolt to thread back into the crank.

    upload_2017-3-10_11-19-41.png

    Good Luck!!!
     
  9. Edem_Alive

    Edem_Alive Veteran Member Lifetime Gold Member

    Messages:
    464
    Likes Received:
    9
    Joined:
    Dec 18, 2015
    Location:
    Montana
    Sounds like a good plan. I'll try it out. Thanks!
     
  10. larrylarry

    larrylarry Veteran Member

    Messages:
    1,553
    Likes Received:
    72
    Joined:
    Dec 22, 2011
    Location:
    San Antonio Tx
    Use a Dremmel Tool with one of those bits that have diamond dust on them. They'll cut a notch easy.
     

Share This Page