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Polishing crank journal after Rod Bearings

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    Polishing crank journal after Rod Bearings

    New member here - just picked up a '05 E46 M3 with 109k miles on it recently. Just did the rod bearings this weekend and they looked as expected except for cylinder 2 which showed some pretty significant wear. There was also visual marking on the crank journal, however, it was not perceptible by touch. I have the new bearing on but the car isn’t reassembled yet, any opinions on me going back to pull that rod cap and polish the journal a bit? Link to photos if they don't load on this post: https://imgur.com/a/I9OaXVm

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    Last edited by acb.m3; 12-11-2024, 02:37 PM.

    #2
    If your fingernail didn’t catch I wouldn’t touch it.
    E46 ///M3 • 12/2002 • phönix-gelb • 6MT
    E39 ///M5 • 12/1998 • avus-blau • 6MT
    E60 ///M5 • 11/2006 • saphir-schwarz • 6MT

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      #3
      ^ send it.
      ‘02 TiAg/Impulse Slicktop

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        #4
        Fair - so far that's been the feedback from everyone I've asked. Next time I need to do bearings ill be pulling the engine anyway for a rebuild, just needs to not blow up for 50k miles of mixed use (track + street).

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          #5
          I thought I saw the pics of the bearings this morning on my phone, but they are all disappeared now? Want to see on the big monitor.

          I would cut some strips of cloth and pull the strip to polish the crank journal using chrome polishing compound.

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            #6
            Originally posted by sapote View Post
            I thought I saw the pics of the bearings this morning on my phone, but they are all disappeared now? Want to see on the big monitor.

            I would cut some strips of cloth and pull the strip to polish the crank journal using chrome polishing compound.
            Weird I don't know what happened to the pics, but here is an external link as as well: https://imgur.com/a/I9OaXVm.

            The chrome polish is exactly what I am considering, if anything just to take down any micro high spots.

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              #7
              It's probably fine. You can feel insanely fine details with your finger so if you can't feel it I bet it's too small to matter.

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