New main bearing wear

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

  1. tom3

    tom3 Veteran Member

    Messages:
    12,031
    Likes Received:
    346
    Joined:
    Aug 1, 1999
    Location:
    ohio
    You didn't by any chance put anything on the back side of the bearings on final assembly? Anything?
     
  2. cadillac_al

    cadillac_al Veteran Member

    Messages:
    842
    Likes Received:
    87
    Joined:
    Apr 22, 2015
    Location:
    Maine
    That sounds good enough to me. It's been a long time since I had a chance to inspect some low mileage bearings but I am always surprised how scuffed up they looked after only a few miles. I have never taken out bearings that looked pristine and new. I kinda think that's how they break in/wear in. I have always used the red slippery assembly lube since the 80's, can't remember the name of it right now. I think you might be ok after all.
     
  3. camaro71/holland

    camaro71/holland Veteran Member

    Messages:
    1,239
    Likes Received:
    86
    Joined:
    Aug 27, 2003
    Location:
    The Netherlands
    Main bearings on the crank out of round? How did the old caps look like?
     
  4. CoastieJoe

    CoastieJoe Member

    Messages:
    46
    Likes Received:
    3
    Joined:
    Jul 29, 2017
    The caps look good and I just re measured all the bearing clearances and they are at .002. I'm thinking about running them. Anyone think I should get new ones? Also just to try something new what's everyone put on their main and rod bearings when installing?
     
  5. jeff swisher

    jeff swisher Veteran Member

    Messages:
    1,385
    Likes Received:
    418
    Joined:
    Apr 26, 2018
    Location:
    Yukon Oklahoma
    Those pictures of the bearings in the block look very dry and clean to me.
    NO way I could make my bearings look that oil /lube free unless I took them out and solvent cleaned them and solvent cleaned the block as lube will be dripping on stuff.

    I want to know what lube you used and did you clean it off for the pictures???

    I use driven assembly lube or Lucas or the EOS and sometimes just Gibbs BR oil.. never an issue with any of it but it leaves everything oily. My bearings look like new after a few turns.

    I think your lube is poor.
    Buddy used WD40 once..Parts store told him he did not need anything on the bearings.
    WOW!
     
  6. CoastieJoe

    CoastieJoe Member

    Messages:
    46
    Likes Received:
    3
    Joined:
    Jul 29, 2017
    I did clean them off to better show the wear.
     
  7. badazz81z28

    badazz81z28 Veteran Member

    Messages:
    16,991
    Likes Received:
    522
    Joined:
    May 4, 2001
    Location:
    Las Vegas, NV
    For an engine that’s never been run?
     
  8. CoastieJoe

    CoastieJoe Member

    Messages:
    46
    Likes Received:
    3
    Joined:
    Jul 29, 2017
    Yes never run
     
  9. 77 cruiser

    77 cruiser Veteran Member

    Messages:
    542
    Likes Received:
    25
    Joined:
    Nov 17, 2006
    Location:
    Frostbite Falls MN
    I'd think about sending it out to be line honed & get the crank checked for straightness.
    I had one like that but it was run, took it down at 15000 miles copper showing in some places on the mains.
     
  10. G72Zed

    G72Zed Veteran Member

    Messages:
    1,202
    Likes Received:
    280
    Joined:
    Sep 8, 2015
    Location:
    Canada
    The wear pattern looks within reason, and perhaps turned too many times on the dry side. If you could turn easy by hand with the mains TQ'd down you will be OK.

    IF you can, set the lower mains in place only, lay in the crank, and toss a dial indicator on the middle main (3rd) it will tell you the run-out if any, repeat on the others to see what comes up.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.