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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

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    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 252  1

    1997 Mitsubishi Eclipse Spyder GST
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  2. BLACK'98DSM

    BLACK'98DSM Proven Member

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    It doesn't appear that it needs to be replaced yet...
     

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  3. silvreclips

    silvreclips Proven Member

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    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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    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  4. dustyboner

    dustyboner DSM Wiseman

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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 Proven Member

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    Junk.
     

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  6. SasaniFab

    SasaniFab Freelancer

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    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.
     

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    645 whp · 498 lb/ft · 1G DSM
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  7. motomattx

    motomattx Proven Member

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    Yeah, that doesn't look good, I wouldn't chance it as cheap as you can replace it for.
     

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  8. ThunderChild

    ThunderChild Supporting VIP

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

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  9. BLACK'98DSM

    BLACK'98DSM Proven Member

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    The o.p. specifically stated that #3 is dirty, and needs to be cleaned.
     

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  10. DSMPT

    DSMPT Proven Member

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    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.
     

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  11. ThunderChild

    ThunderChild Supporting VIP

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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.
     

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  12. SasaniFab

    SasaniFab Freelancer

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    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:

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  13. EVLGSX

    EVLGSX Proven Member

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    cleaned?! that thing is done son
     

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  14. DSMPT

    DSMPT Proven Member

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  15. BLACK'98DSM

    BLACK'98DSM Proven Member

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

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  16. EVLGSX

    EVLGSX Proven Member

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    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.
     

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  17. ThunderChild

    ThunderChild Supporting VIP

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

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