New main bearing wear

Discussion in 'Engine Topic' started by CoastieJoe, Oct 15, 2019.

  1. CoastieJoe

    CoastieJoe Member

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    My SBC is cursed! I've almost had it finished twice but keep finding something. On this tear apart I noticed that the new main bearings had wear on them even though the engine had never been run. Just cranked on while rebuilding. It looks like the flat colored coating is already wearing off. Is the wear in the pictures normal? And it seemed to be get worse towards the front. And yes I put breal in oil on them during install. The pictures are in order from front to rear. Thanks guys.
     

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  2. camaro71/holland

    camaro71/holland Veteran Member

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    Have you checked and if so what are the clearances?
     
  3. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Another simple thing; how easy/hard does the crank turn when it's torqued down? Just the crank only, no rods or pistons installed. It should not have any spots where it's harder or easier to turn.
     
  4. budro6968

    budro6968 Veteran Member

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    Should turn over like butter with one finger. Those look like they were spun dry. Definitely check oil clearance with some plastic gauge.
     
  5. xten

    xten Veteran Member

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    Was assembly used?
     
  6. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Yep, I should have asked about assembly lube, think xten meant that. I'm an old fashion Lubriplate guy.
     
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  7. CoastieJoe

    CoastieJoe Member

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    I used assembly lube and I checked the clearance with plastic gauge and it was good. The crank spun freely when I had it in.
     
  8. Dave Nelson

    Dave Nelson Veteran Member

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    Could you turn the crank by hand?
     
  9. COPO

    COPO Veteran Member Lifetime Gold Member

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    Incorrect clearance.
     
  10. czizza

    czizza Veteran Member

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    If you plasti gauge it and it checked out then maybe your align center bore could be off. Do you have a machine ruler so you can see if you are good front to back.
     
    Last edited: Oct 17, 2019

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