Fixing a crack in a Crankshaft

Discussion in 'PSI Superchargers Tech Questions' started by 57Chev, Dec 18, 2019.

  1. 57Chev

    57Chev Member

    Joined:
    Dec 27, 2014
    Messages:
    57
    Likes Received:
    0
    Just want some opinion here for reliability on a repaired Crankshaft. I have a new one coming and wondering if I should fix my old one as a spare. It has a crack on number two main. Its out of a Screw Pro Mod.


    Thanks
     
    #1
  2. aj481x

    aj481x Member

    Joined:
    Jan 27, 2004
    Messages:
    963
    Likes Received:
    17
    Cracks in the radius? Clearly visible with mag?
     
    #2
  3. 57Chev

    57Chev Member

    Joined:
    Dec 27, 2014
    Messages:
    57
    Likes Received:
    0
    By mag yes. its about 1/4 of the way around the journal. Right on the edge.
     
    #3
  4. aj481x

    aj481x Member

    Joined:
    Jan 27, 2004
    Messages:
    963
    Likes Received:
    17
    Probably not repairable, might keep as emergency spare, it was running when you took it out.
     
    #4
  5. 57Chev

    57Chev Member

    Joined:
    Dec 27, 2014
    Messages:
    57
    Likes Received:
    0
    Ya, was doing yearly maintenance and had the crank tested and was cracked.
     
    #5
  6. Fueler75

    Fueler75 Member

    Joined:
    Jan 13, 2005
    Messages:
    89
    Likes Received:
    0
    #6
  7. kosky racing

    kosky racing Comp Eliminator

    Joined:
    May 11, 2003
    Messages:
    725
    Likes Received:
    34
    If its broke don't waste money shipping it anywhere done this to many times -----Broken is Broken
     
    #7
    Will Hanna likes this.
  8. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,645
    Likes Received:
    111
    Hate to say it, if it's cracked that far around, it's junk. If you have someone that is experienced with blown alcohol/racing cranks, it might be worth magnafluxing to confirm it is a crack. If it's a no doubter, it's junk.

    I've seen broken cranks just break and cause minimal damage. I've also seen broken cranks destroy everything in a short block - block needed 5 saddles, so it wasn't worth repairing. Rocker shafts were bent, flywheel was junk, tore up parts in the front section of the trans, so it was costly.
     
    #8
  9. Unlimitedaero

    Unlimitedaero Member

    Joined:
    Oct 26, 2014
    Messages:
    67
    Likes Received:
    1
    They make great table lamps......
     
    #9
  10. MKR-588

    MKR-588 Member

    Joined:
    May 2, 2008
    Messages:
    143
    Likes Received:
    0
    Just curious why he didn't wait til nite time?
    But really , not good. Hope hes well.
     
    #10
  11. quickcut

    quickcut Member

    Joined:
    Mar 22, 2016
    Messages:
    35
    Likes Received:
    2
    Ok Sorry to jump the thread.
    Who is the best to send a crank to for repair ?
    Mine has a big gouge in it.but it is not cracked.
    I want welded & machine back to Standard
     
    #11
  12. kosky racing

    kosky racing Comp Eliminator

    Joined:
    May 11, 2003
    Messages:
    725
    Likes Received:
    34
    Where are you located?
     
    #12
  13. quickcut

    quickcut Member

    Joined:
    Mar 22, 2016
    Messages:
    35
    Likes Received:
    2
    Australia
     
    #13
  14. kosky racing

    kosky racing Comp Eliminator

    Joined:
    May 11, 2003
    Messages:
    725
    Likes Received:
    34
    Sorry cant help you there -marine crankshaft repair -David Eden - Calif.
     
    #14
  15. altered8

    altered8 Member

    Joined:
    Mar 9, 2005
    Messages:
    63
    Likes Received:
    1
    Crank shaft rebuilders in Melbourne if you want to keep in aus, but I’d send to marine cranks in California,not that expensive to freight when it’s for repairs
     
    #15

Share This Page