Stabilizer Bar fixing torque settings - 63Nm for M8 ??? | FerrariChat
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Stabilizer Bar fixing torque settings - 63Nm for M8 ???

Discussion in '456/550/575' started by Bertt, Jan 28, 2014.

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  1. Bertt

    Bertt Formula Junior

    Nov 16, 2011
    277
    The Netherlands
    Full Name:
    Bert
    #1 Bertt, Jan 28, 2014
    Dear fellow members,

    I have a bit of an issue with what torque setting to apply for the stabilizer bar fixings (where the rubbers are held in place). For a 550 this is found in Parts table 50 boltnr. 34 & nut nr. 37 (for a 575 it is parts table 54, same numbers for the bolt & nut. I looked up the torque tables in both the 550 WSM and the 575 WSM. In the 550 WSM I can't find it anywhere (pages F45 & F46), and in the 575 WSM in section F02.06 a torque of 63 Nm is mentioned. The bolt removed shows it is a grade 8.8 bolt, so I bought 4 new bolts and nuts of the correct grade at our local ironware shop. When tightening the very first one to the specified torque this immediately destroyed the thread and I had to saw the parts loose again.

    So I don't trust these bolts&nuts anymore and bought 4 new bolts & nuts from the local Ferrari dealer. They are slightly different in the sense that these look to be galvanised bolts in stead of the passivated ones that I got from the local ironware shop. But also grade 8.8.

    What do you think about the torque of 63Nm as stated in the 575 WSM? It looks an awful lot to me considering that this is an M8 x 90mm bolt & nut, grade 8.8. I also looked up some industry tables for standard torque settings and for M8 grade 8.8 these never exceed 28Nm……

    Any suggestions highly appreciated !!
     
  2. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    36,756
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #2 Rifledriver, Jan 28, 2014
    Last edited: Jan 28, 2014
    8.8 is the standard grade. In 8mm that means 18-20 lb/ft. 63nm is about 45 lb/ft.

    Torque specifications in the books have always been very inconsistent for accuracy. It really pays to understand the Eu fastener grading system and have a standard set of fastener torque specs as a reality check. Most torque wrenches have one in the box.

    At least in the modern era Ferrari makes books. In the old days you were on your own. Things are progressing, glacially but progressing.


    If your torque wrench has no NM scale multiply Nm x .7233 = lb/ft.


    For some of the special fasteners we have had to resort to buying spares and destructive test them to see how to put things back together. If you install an F50 head the way the book says you will wreck a lot of expensive stuff. The cams on those have no marks either. It's really fun reassembling one that wasn't marked on disassembly.

    I really love it when people around here say this is no different than fixing Chevy's.


    Just wait until you get to use the electrical diagrams. Did you know that the 550 wipers are run by the engine ECU? According to Ferrari they are.
     
  3. Bertt

    Bertt Formula Junior

    Nov 16, 2011
    277
    The Netherlands
    Full Name:
    Bert
    #3 Bertt, Jan 28, 2014
    Thans Brian !
    That (24.5 - 27.1 Nm) indeed makes a lot more sense and thanks for the warning about the inconsistencies in the books. Have just now googled and printed a standard metric torque table and will keep that as guidance.

    Hope I will be spared from electrical gremlins... At the moment (knock on wood !!) everything works as it should
     

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