Flywheel O-ring sizes (1 big and 12 small) | FerrariChat
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Flywheel O-ring sizes (1 big and 12 small)

Discussion in '348/355' started by Dolcevita, May 30, 2023.

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  1. Dolcevita

    Dolcevita Formula 3
    Owner Silver Subscribed

    Jul 5, 2011
    1,468
    Ontario, Canada
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    Craig
    #1 Dolcevita, May 30, 2023
    Last edited: May 30, 2023
    The flywheel o-rings from Ricambi are no longer available. By searching previous threads I found the size and other specs that worked for the large ring (240 to 242 mm ID with 3 mm cross section, Viton, hardness around 75 shore A).

    That leaves the 12 small o-rings. Does anyone happen to know the size of these? The flywheel is still on the car, but I wanted to get the parts before disassembly, so I haven't been able to measure anything.

    Thanks...Craig
     
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  2. alexjack

    alexjack Karting

    Jun 29, 2013
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    New England
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    Don
    #2 alexjack, May 31, 2023
    Out of curiosity, and since I’m looking for them too, I found the ones that I replaced a few years ago and measured them. It looks like roughly 10.8mm outer diameter with a 1.9mm thickness. I compared it to a set of nitrile rings I have and while that size isn’t in my set, it looks very close. Image Unavailable, Please Login


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  3. Dolcevita

    Dolcevita Formula 3
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    #3 Dolcevita, May 31, 2023
    Thank you. That's close to what I was guessing they would be.
     
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  4. Dolcevita

    Dolcevita Formula 3
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    Jul 5, 2011
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    Craig
    #4 Dolcevita, Jun 2, 2023
    I ended up using a 240 mm ID o-ring with a 3 mm cross section (OD 146 mm). For the 12 small o-rings I used ones measuring 8 mm ID with a 1.5 mm cross section, so 11 mm OD. All were Viton with a shore A of 80. They seemed very close to the originals. We'll see how they work out.
     

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