Front/rear "ring nut" torque specs? | FerrariChat
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Front/rear "ring nut" torque specs?

Discussion in '308/328' started by rjd2, Oct 23, 2020.

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  1. rjd2

    rjd2 Karting

    Jul 28, 2016
    125
    #1 rjd2, Oct 23, 2020
    Hi all, so I finally have my front and rear hubs rebuilt with bearings and grease packed. Can anyone confirm the front and rear ring nut torque specs? I'm seeing 160 ft/lbs for the rear(my shop who packed the bearings said the fronts were much less); does that sound right? Thanks.
     
  2. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
    13,558
    San Carlos, CA
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    Mitchell Le
    #2 yelcab, Oct 24, 2020
    I have 220 Nm, which is about 160 ft-lbs
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
    26,794
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #3 Steve Magnusson, Oct 24, 2020
    You need to be specific about what model -- 308 and 328 are quite different fish in this regard.

    Also, are you trying to confuse us? IIRC, there is no "ring nut" used at the front on either 308 nor 328 ;).
     
    thorn likes this.
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
    26,794
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    Steve Magnusson
    #4 Steve Magnusson, Oct 24, 2020
    They seem to have left the torque spec for the 328 front spindle nut (124642) securing the front hub to the front stub axle out of the 308QV/328 WSM (maybe because 308QV and 328 are such different designs), but, since this same M20x1.5P nut is used on the TR front spindle, the torque spec there (after some translation gymnastics ;)) is 16 daN-m (118 lb-ft) so is somewhat less than the torque used on the M27 ring nut at the rear.
     
  5. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,259
    Black Forest Germany
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    Martin N.
    #5 Martin308GTB, Oct 24, 2020
    God help that guy, who torques down the front nut on a 308 with 160Nms. Or with ANY torque.


    Best from Germany
    Martin
     
    thorn, waymar, Steve Magnusson and 1 other person like this.
  6. rjd2

    rjd2 Karting

    Jul 28, 2016
    125
    #6 rjd2, Oct 25, 2020
    Apologies in my "terminology laziness"-yes, front spindle nut/rear ring nut.

    1978 308 GTS is the car in question. Ok, it sounds like 160 ft/lbs in the rear is the consensus. In the 308QV manual, I'm assuming this is "securing axle shaft flange to wheel shaft", which shows as 22kgm, which looks to calculate to just under 160 ft/lbs. Thanks folks!(glad I found the 308QV WSM, now I can stop asking stupid suspension torque questions)
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
    26,794
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #7 Steve Magnusson, Oct 25, 2020
    That is correct for the rear ring nut (the same torque spec is shown in the 308GT4 WSM -- this WSM much more closely matches a 1978 308B/S), but the front spindle nut on a 308 isn't torqued at all as Martin indicated. It's positioned cold to have the smallest amount of free play so that when the brake rotor heats up and expands, the tapered roller bearings are not overloaded.
     
    waymar likes this.
  8. thorn

    thorn F1 Rookie
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    Aug 7, 2012
    3,324
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    #8 thorn, Oct 25, 2020
    I believe the front axle nut is torqued to something like 14-20 ft lbs, then backed off slightly.

    Been a while since I did it, but absolutely not 160.
     
    waymar likes this.
  9. rjd2

    rjd2 Karting

    Jul 28, 2016
    125
    #9 rjd2, Oct 25, 2020
    Perfect-my tech said he torqued it to "around 15 ft/lbs), so that sounds about right.
     

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