Shifter Shaft Seal revisited | Page 3 | FerrariChat

Shifter Shaft Seal revisited

Discussion in '308/328' started by jh355, Nov 21, 2006.

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  1. Brian A

    Brian A F1 Rookie

    Dec 21, 2012
    3,153
    SanFrancisco BayArea
    Full Name:
    1983 US 308 GTS QV
    I apologize for the excessive use of technical jargon in my prior post.

    Yeah, an odd numbered gear (such as third) seems like a good choice because it will move the front shaft forward giving a smidge more clearance while yanking out the rear shaft.
     
  2. sir_sire

    sir_sire Rookie

    Jul 19, 2022
    44
    Aachen, Germany
    Hi everyone,

    I'm looking at doing the replacement at my car atm.
    I saw dimensions of the seals mentioned earlier in this thread being 20 x 28 x 5,5 mm, but that seems a little weird to me. As usually the ID + 2x width should be the OD...

    Does anyone know the correct dimensions for the quad-ring or the machined groove and shaft dimensions? Nobody in Europe supplies the quad-rings and I'd like to use those.
     
  3. Freddie328

    Freddie328 Formula Junior

    Jul 29, 2013
    393
    Herts, UK
    Full Name:
    Richard
    #53 Freddie328, Jul 14, 2025
    Last edited: Jul 14, 2025
    The quad rings are available in the UK and last time I checked we were geographically in Europe:)

    See link for size that fits. I've used these and they fit well. The OD size you have quoted is for the original fitment seal. Quad rings have different ID/OD ratios.
    https://simplybearings.co.uk/shop/O-Ring-Seals-FKM-X-Rings/c4501_8571/index.html?srsltid=AfmBOopjO5UoSPYobaLkEtkoebgCYRueclZQwE7ZuPsOqlA4C_SUmGC_&selection=FKM+Rubber+X-Rings
    This size is for later 308's and 328's. I understand that early 308's had a different size OD (slightly smaller)
     
  4. todzilla220

    todzilla220 Rookie

    Nov 25, 2024
    15
    Cambridge, OH USA
    Full Name:
    Todd Mathers
    I have the same leak on my recently inherited 82 GTSi. I was wondering, is there anyone who's done a youtube or pictures of the replacement out there? I've done some searching and coming up mostly nil. I'm more prone to DIY stuff when I have a video to reference. Yes, I'm the guy that looks at the pictures, does poorly at comprehension unless I have a visual. lol
     
  5. Dockboy

    Dockboy Formula Junior
    Silver Subscribed

    May 11, 2013
    630
    Maryland
    No pictures, but a procedure;)

    https://unobtainiumsupply.com/Downloads/Service Procedures/Quad shift seal installation tips.pdf
     
  6. absostone

    absostone F1 World Champ
    Silver Subscribed

    Jul 28, 2008
    10,175
    I used Unobtanium Xring seals. ZERO issues shifting since day one around to 2018? IIRCC
     
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  7. nitro

    nitro Karting

    Dec 9, 2012
    188
    Snowmass/KenCaryl
    2 X unobtanium seals. Installed 3 yrs ago and nada. bone dry.
     
    absostone likes this.
  8. todzilla220

    todzilla220 Rookie

    Nov 25, 2024
    15
    Cambridge, OH USA
    Full Name:
    Todd Mathers
    Thank you. I've been reading on this and appreciate all the feedback.
    Just still not sure if this is a job I'm going to want to undertake yet! Looking around for an experienced mechanic in the Ohio area as well to get a quote/idea.

    Thanks all,
     
    absostone likes this.
  9. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
    Full Name:
    Lawrence A. Coppari
    I replaced my seals with the Unobtainium Xring variety probably ten years ago. No leaks but it took about 500 miles for them to loosen up.
     
  10. dave80gtsi

    dave80gtsi Formula 3
    Silver Subscribed

    Nov 3, 2003
    1,948
    Ohio
    Full Name:
    Dave Meredith
    You are in Cambridge? Tomorrow (Saturday) morning is the huge annual Dublin Arthritis Foundation car show. Always lots of Ferrari and other exotics makes there.

    You should attend and start your local networking amongst the owners there.
     
  11. todzilla220

    todzilla220 Rookie

    Nov 25, 2024
    15
    Cambridge, OH USA
    Full Name:
    Todd Mathers
    Yes, I'm in Cambridge OH in the southeastern corner of the state where interstates I70 and I77 intersect. :)
     
  12. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,354
    UK
    Exactly the same, only i did it 14 years ago

    I changed my gearbox oil 2 weeks ago and no sign of any overflow when I took the gearbox fill plug out.
     

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