CV Bolt torque? | FerrariChat

CV Bolt torque?

Discussion in 'Boxers/TR/M' started by JIMBO, Oct 29, 2025 at 6:06 PM.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. JIMBO

    JIMBO Formula 3 Silver Subscribed

    Joined:
    Oct 31, 2003
    Messages:
    1,387
    Location:
    Bradenton, Florida
    Full Name:
    Jim DeRespino
    As the title implies, can anyone tell me the torque of the 6 hex-head bolts that connect the CV joint of the axles to the differential (1994 512TR)? I've looked in the books but I can't seem to find it.
    Thanks. Image Unavailable, Please Login
     
  2. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,650
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    not know exactly and I never used a torque wrench
    but I would take between 55 and 65 Nm
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

    Joined:
    Jan 11, 2001
    Messages:
    27,007
    Location:
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    It's on page N20 in the 512TR WSM Vol. 2 -- but they mangled the units. It says 78 daNm, but that would be a crazy impossibly high torque. My guess is that they meant 78 Nm = 57 ft-lbs (based on the TR being 6 daNm = 60 Nm with the same size fastener).
     
    Last edited: Oct 29, 2025 at 6:44 PM
    turbo-joe likes this.
  4. JIMBO

    JIMBO Formula 3 Silver Subscribed

    Joined:
    Oct 31, 2003
    Messages:
    1,387
    Location:
    Bradenton, Florida
    Full Name:
    Jim DeRespino
  5. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,650
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    this I think so too
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

    Joined:
    Jan 11, 2001
    Messages:
    27,007
    Location:
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    And the blame can be placed solely on the nutball proponents of the metric system in the 1980s ;). Not only did they want all units to be metric, their "plan" was that everything could be expressed with more "simple" numbers by using the various prefixes on the units -- e.g., ...mega, kilo, hecto, deca, the base unit (e.g., meter, gram, liter), deci, centi, milli, micro, nano, etc. -- which was horrible idea. Ferrari was just trying to be a good metric euro soldier when they started using torque units of daNm in the TR WSM. No one on Earth today talks about torque in units of daNm, and, this mistake in the 512TR WSM, IMO, shows that by the early 1990s, the more sensible idea of always using just Nm for torque, and then whatever number was needed, became the much less confusing convention -- thank goodness!
     
    Rifledriver likes this.
  7. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,650
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    :) :) :)
    I would not say horrible idea. we in europe are used to this mega, hecto, kilo, less the deca, but also the deci, centi, milli, micro, nano

    but ferrari is italian and in italy all is a little different as we all know :) :)
     
  8. EDoug

    EDoug Formula Junior

    Joined:
    Apr 19, 2005
    Messages:
    291
    Location:
    Southern Florida
    While you are at it, who were the morons that wanted to change "foot-pound" to "pound-feet" of torque? In plain English, one foot-pound will always be one foot-pound. Guess it is old dogs new tricks or something. EDoug
     
  9. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,650
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    here in europe the foot-pound or the pound-feet is totally unusual. may be in UK not?
     
    TestaDDS likes this.
  10. TestaDDS

    TestaDDS Karting

    Joined:
    Sep 6, 2015
    Messages:
    107
    Location:
    France
    Full Name:
    RM
    The use of da.Nm comes from its closeness to kg.m, which was commonly used in the past. This is no longer the case, as kg.m has fallen into disuse.
     
    turbo-joe likes this.
  11. pshoejberg

    pshoejberg Formula 3 Silver Subscribed

    Joined:
    Dec 22, 2007
    Messages:
    1,884
    Location:
    Denmark
    Full Name:
    Peter H
    Grade 10.9, M10 bolt, fine thread, table says 73 Nm, so 78 Nm should be ok. Long live the metric system. I've noticed that even Americans are using metrics when they deal with stuff that needs small tolerances:D

    Image Unavailable, Please Login

    Best, Peter
     
    turbo-joe likes this.

Share This Page