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91 348 clutch torque

Discussion in '348/355' started by bayferrari, Nov 23, 2017.

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  1. bayferrari

    bayferrari Karting
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    Mar 10, 2011
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    William
    #1 bayferrari, Nov 23, 2017
    just finished regreasing my 1991 348 clutch and flywheel. What is the torque of the 6 bolts that hold the starter ring/ flywheel to the clutch assembly? I seem to have read 22 ft.lbs, is that correct? It's a twin disc clutch system.
    Thanks all
     
  2. steved033

    steved033 F1 World Champ
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    Apr 12, 2017
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    Steve D.
    #2 steved033, Nov 23, 2017
    sounds about right. a drop of blue loctite won't hurt either. tighten like lug nuts in a star pattern.

    sjd
     
  3. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    Mitchell Le
    #3 yelcab, Nov 23, 2017
    You will strip the heads off the M6 suckers if you torque them to 22 ft-lbs.
    Try 18 Nm.
     
  4. m.stojanovic

    m.stojanovic F1 Rookie
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    Miroljub Stojanovic
    #4 m.stojanovic, Nov 23, 2017
    The bolts are, if I remember well, M8 grade 10.9. The standard tightening torque for such bolts is 34 NM (25 ft.lbs). However, I found info that, on the 348 clutch, they should be tightened to 24 NM (18 ft.lbs), probably because they are threaded into aluminium (the flywheel).

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    FloridaIsland348, MD Clutches and ernie like this.
  5. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
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    #5 ernie, Nov 23, 2017
    Great chart!
     
  6. JasonS

    JasonS Karting

    Sep 5, 2019
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    Jason Stropki
    #6 JasonS, Feb 23, 2024
    I've searched and scanned many threads as usual, and I found this thread was helpful for the flywheel-to-voith bolt torque values. My further questions are:

    1. Does anybody have the torque values handy for the other flywheel bolts that hold the clutch pack together to the flywheel?

    2. It also appears that the replacement for the Kluber grease is mentioned as Superlube 41160. Has anybody used this and how are the results?

    3. Lastly, I haven't found the various voith o-rings listed on the common Ferrari parts vendor websites. Does anybody have a source for these, or better yet a kit?
     
  7. Ferrarium

    Ferrarium F1 Veteran
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    Eric
    #7 Ferrarium, Feb 23, 2024
    MD clutches had a kit before they closed their doors. For o-rings use mcmaster-carr.
     
    JasonS likes this.

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