Fixing a crack in a Crankshaft

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

  1. 57Chev

    57Chev Member

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    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
    57Chev, Dec 18, 2019
  2. aj481x

    aj481x Member

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    Cracks in the radius? Clearly visible with mag?
     
    #2
    aj481x, Dec 18, 2019
  3. 57Chev

    57Chev Member

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    By mag yes. its about 1/4 of the way around the journal. Right on the edge.
     
    #3
    57Chev, Dec 18, 2019
  4. aj481x

    aj481x Member

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    Probably not repairable, might keep as emergency spare, it was running when you took it out.
     
    #4
    aj481x, Dec 19, 2019
  5. 57Chev

    57Chev Member

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    Ya, was doing yearly maintenance and had the crank tested and was cracked.
     
    #5
    57Chev, Dec 19, 2019
  6. Fueler75

    Fueler75 Member

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    #6
    Fueler75, Jan 3, 2020
  7. kosky racing

    kosky racing Comp Eliminator

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    If its broke don't waste money shipping it anywhere done this to many times -----Broken is Broken
     
    #7
    kosky racing, Jan 3, 2020
    Will Hanna likes this.
  8. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    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
    Will Hanna, Jan 6, 2020
  9. Unlimitedaero

    Unlimitedaero Member

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    They make great table lamps......
     
    #9
    Unlimitedaero, Jan 7, 2020
  10. MKR-588

    MKR-588 Member

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    Just curious why he didn't wait til nite time?
    But really , not good. Hope hes well.
     
    #10
    MKR-588, Feb 11, 2020
  11. quickcut

    quickcut Member

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    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
    quickcut, Feb 11, 2020
  12. kosky racing

    kosky racing Comp Eliminator

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    Where are you located?
     
    #12
    kosky racing, Feb 11, 2020
  13. quickcut

    quickcut Member

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    Australia
     
    #13
    quickcut, Feb 11, 2020
  14. kosky racing

    kosky racing Comp Eliminator

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    Sorry cant help you there -marine crankshaft repair -David Eden - Calif.
     
    #14
    kosky racing, Feb 12, 2020
  15. altered8

    altered8 Member

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    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
    altered8, Feb 17, 2020

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