ZF S5 17 Synchro Ring Question | FerrariChat
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ZF S5 17 Synchro Ring Question

Discussion in 'Maserati' started by Jcgrimes, Oct 4, 2025 at 9:50 AM.

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  1. Jcgrimes

    Jcgrimes Rookie

    Dec 20, 2024
    19
    Full Name:
    John Grimes
    #1 Jcgrimes, Oct 4, 2025 at 9:50 AM
  2. redfred84

    redfred84 Formula Junior

    Dec 24, 2010
    756
    SF Bay Area, USA
    #2 redfred84, Oct 6, 2025 at 11:21 AM
    Actually it's the inner diameter of the brass syncro ring that does the work. It acts like a brake on the gear surface that it mates with. This is why it's important to use the proper, old fashioned gear oil for this application; NOT the modern synthetics.
     
  3. Jcgrimes

    Jcgrimes Rookie

    Dec 20, 2024
    19
    Full Name:
    John Grimes
    #3 Jcgrimes, Oct 6, 2025 at 12:39 PM
    Thank you, Do you know what the tolerances are for this part?
     
  4. redfred84

    redfred84 Formula Junior

    Dec 24, 2010
    756
    SF Bay Area, USA
    #4 redfred84, Oct 7, 2025 at 10:54 AM
    No idea on tolerance. The ID of the brass ring actually "grabs" the mating surface of the steel gear, and acts as a brake. Any wear, or microscopic polishing can foul this up. It's probably not perceptable to the naked eye? This is why the gear lube is essential; it has to be the old fashioned oil. Sorry I don't have a good answer for you.
     

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