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Thread: rod bearings - undersize vs oversize?

  1. #1

    rod bearings - undersize vs oversize?

    What would I need undersized bearings for? what would I need oversized bearings for? I thought our bearings are color-coded?
    How do I choose?
    3geez member since October 12, 2000
    "All this worldly wisdom was once the unamiable heresy of some wise man." - Henry David Thoreau

  2. #2
    2.0Si User
    Join Date
    Nov 2004
    88 LXi
    Knoxville TN

    Re: rod bearings - undersize vs oversize?

    The color coding is under or over sized. There matching the bearings the dimensions of the crank at the factory. I dont know what color is what bearing.


  3. #3

    shepherd79's Avatar
    Join Date
    Apr 2002
    01 Civic lx auto; 03 Accord EX
    Falling Waters, WV USA

    Re: rod bearings - undersize vs oversize?

    the only way to find out what bearing you need, you have to rip the engine apart.
    You can find more info in shop manual.

  4. #4
    2.0Si User
    Join Date
    May 2004
    1988 Accord DX

    Re: rod bearings - undersize vs oversize?

    Yeah, you need to tear the engine apart & plastigauge the main & rod bearings to determine what oversized bearings you need.
    Depending on if you have your crankshaft turned, the machinist will inform you to the appropriate size bearings to buy.

  5. #5
    LX User
    Join Date
    Nov 2005
    '91 Accord Wagon (F22B1 with H23A1 Pistons) '98 Accord LX (Wife's) '88 Prelude Si (B21A1), '85 CR-X Si (D16Z6)
    Salem, Oregon

    Re: rod bearings - undersize vs oversize?

    Yeah, the color coding is stupid. The amount of differences in size are .0001", and there is usually less variation than that in "standard" bearings. We just buy the standard bearing set and mike each unit, and the journals on the crank. then match them up. It's far less expensive (than $11 per bearing HALF from Honda), and works just as well. I'm currently using NDC rod bearings and ACL main bearings & thrust washers in my Accord. No trouble in 8000 miles (1.5 years, just don't drive much).
    Visit us at for all of your Honda and Acura Parts and Service needs!

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