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Is light crank scoring ok?

Posted by John Mark Dongon, Apr 8, 2019

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  1. John Mark Dongon

    John Mark Dongon Proven Member

    38
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    Joined Feb 7, 2019
    Stockton, California
    I don't want to disassemble and buy a whole new crankshaft if it's not all that bad. It's light scoring I can feel with my fingernails. It's overall more smooth than scoring tho. The 3rd journal is not scoring just dirty. 20190408_162404.jpg 20190408_162535.jpg
     

    Street Build 150  1

    1997 Mitsubishi Eclipse Spyder GST
    automatic · 2G DSM
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  2. BLACK'98DSM

    BLACK'98DSM Proven Member

    135
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    Hoover, Alabama
    It doesn't appear that it needs to be replaced yet...
     

    Street Build 514  2

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  3. silvreclips

    silvreclips Proven Member

    857
    62
    Joined Jul 19, 2005
    Greenville, South Carolina
    The rule of thumb is if you can feel scratches with your nail it needs to be polished. I'm sure you can slap some new bearings in and it will run, but for how long will be the question.
     
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  4. dustyboner

    dustyboner Proven Member

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    abq, New Mexico
    you might be able to get by with having it polished. You should take it to a machine shop and have them check it out
     
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  5. bastarddsm

    bastarddsm Supporting Vendor

    4,343
    914
    Joined Aug 26, 2003
    Mendota, Illinois
    Junk.
     

    Showcar Build 4K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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    ThunderChild likes this.
  6. amsrn13

    amsrn13 Freelancer

    2,025
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    danbury, Connecticut
    The only thing that crank should be used for is a paper weight. That crank journal looks like it has layer of aluminum bonded to it.
     

    Street Build 2K  20

    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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  7. motomattx

    motomattx Proven Member

    1,421
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    Joined Dec 9, 2010
    wampum, Pennsylvania
    Yeah, that doesn't look good, I wouldn't chance it as cheap as you can replace it for.
     

    Drag Race Build 2K  13

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  8. ThunderChild

    ThunderChild Previously tametalon92

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    Rathdrum, Idaho
    Agreed. that #3 journal is effed. best case it might be salvageable, but i doubt it.
     

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    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 647  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

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    awd · manual · 1G DSM
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  9. BLACK'98DSM

    BLACK'98DSM Proven Member

    135
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    Joined Feb 9, 2019
    Hoover, Alabama
    The o.p. specifically stated that #3 is dirty, and needs to be cleaned.
     

    Street Build 514  2

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  10. DSMPT

    DSMPT Proven Member

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    Mexico, Arizona
    The point is why the op is doing this. I remember that he said in his other post that he rotated the crank a couple of times by hand then some bearings got damaged because of dirt/debris. So our suggestion would be the same like we already recommended him that clean everything up and rebuild properly with good parts.
     

    Street Build 861  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

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    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  11. ThunderChild

    ThunderChild Previously tametalon92

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    Agreed.
    May be that it's dirty, but that #3 journal looks undersized and the finish looks poor. Still could just be whatever goop is on it.

    At minimum the crank needs to be taken out, properly cleaned, checked to specs and machined if possible. Issue is it may not be worth it, just have to pull it and see.
     

    Street Build 395  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

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    1992 Eagle Talon TSi AWD
    manual · 1G DSM

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    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  12. amsrn13

    amsrn13 Freelancer

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    danbury, Connecticut
    Thats crank is done, short of you machining the journal undersized which some say is not recommended , it is unusable. Notice he similarities?
     

    Attached Files:

    Street Build 2K  20

    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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  13. EVLGSX

    EVLGSX Proven Member

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    Wallingford, Connecticut
    cleaned?! that thing is done son
     

    Street Build 942  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  14. DSMPT

    DSMPT Proven Member

    348
    100
    Joined Jun 12, 2014
    Mexico, Arizona

    Street Build 861  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    Drag Race Build 561  1

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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    ThunderChild likes this.
  15. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Hoover, Alabama
    Agreed, if the money is in hand a new one would be a good investment.
     

    Street Build 514  2

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  16. EVLGSX

    EVLGSX Proven Member

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    Wallingford, Connecticut
    Idk know what to make of this.......all good though man

    edit: got it now, had to read that a few times

    all I know is that looks like some NAR NAR to me

    Look around for a parts car or partout. you could find a crank way better than that for a couple hundred or even less if your patient. I picked up a clean never torn down shortblock for 150 last summer, for example.
     

    Street Build 942  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  17. ThunderChild

    ThunderChild Previously tametalon92

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    Rathdrum, Idaho
    Agreed, and being a 7-bolt it's far easier to find a good crank than a 6-bolt.
     

    Street Build 395  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 647  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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