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Flywheel bolt replacement

Discussion in '308/328' started by flyngti, Mar 8, 2010.

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  1. flyngti

    flyngti Formula 3

    Jul 16, 2009
    1,246
    Snohomish, WA
    Full Name:
    Eric L
    #1 flyngti, Mar 8, 2010
    In the middle of my clutch replacement, I realized my flywheel needs to be resurfaced. I'm planning on replacing my flywheel bolts when I put the flywheel back on.

    Questions:

    1) I've always been told to replace flywheel bolts. How necessary is this?
    2) The bolt head has "R12" and four lines (like a pyramid). I'm not familiar with this designation on a bolt. Can I just use a class 8.8 bolt from a local fastener shop? I believe they are 10x1.25x25.
     
  2. JV's89

    JV's89 F1 Veteran
    Owner Rossa Subscribed

    Jul 18, 2006
    7,299
    Pittsburgh, PA
    Full Name:
    John
    #2 JV's89, Mar 8, 2010
    I think those marks indicate that the bolts are grade 5 bolts (commonly available) but I've never heard of replacing them.
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,105
    Cowboy Capitol of the World
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    Brian Crall
    #3 Rifledriver, Mar 8, 2010
    Reuse the old bolts. No one replaces them and you will be sure they are the correct ones..
     
  4. flyngti

    flyngti Formula 3

    Jul 16, 2009
    1,246
    Snohomish, WA
    Full Name:
    Eric L
    #4 flyngti, Mar 8, 2010
    Last edited by a moderator: Sep 7, 2017
    Ok, good to know. Somehow I remember a voice from my early wrenching years to always replace the bolts, but I'm good with reusing as long as it's safe.

    btw, here are the markings on the bolt head.
    Image Unavailable, Please Login
     
  5. CliffBeer

    CliffBeer Formula 3

    Apr 3, 2005
    2,198
    Seattle, Washington
    Full Name:
    Cliff
    #5 CliffBeer, Mar 9, 2010
    But if you do replace them, then personally I would reco using 12.9s.....
     

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