328 Differential Flange | FerrariChat

328 Differential Flange

Discussion in '308/328' started by 328GTB, Aug 5, 2018.

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  1. 328GTB

    328GTB Formula Junior

    Jun 4, 2002
    305
    Texas, USA
    Full Name:
    Carmine
    The 328/308 WSM manual appears to list contradictory specs on the size of the bolt and torque spec to differential.

    The M5 table lists the bolt as M12x1.25 and 9 KgM (65 Ft-Lbs) but Fig 19, page E23 shows 80 NM (59 Ft-Lbs).

    The actual bolt is M12x1.5

    Can anyone verify the correct bolt size and torque spec?

    Thanks,
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  2. thorn

    thorn F1 Rookie
    Silver Subscribed

    Aug 7, 2012
    3,324
    Tallahassee, FL
    I can't verify the bolt size, but can tell you that I used the torque value of 65 ft lbs when changing the diff seals. 6 months later - no leaks, problem, nor weird noises.
     
  3. 328GTB

    328GTB Formula Junior

    Jun 4, 2002
    305
    Texas, USA
    Full Name:
    Carmine
    Thanks for the quick response. Did you use loctite?
     
  4. thorn

    thorn F1 Rookie
    Silver Subscribed

    Aug 7, 2012
    3,324
    Tallahassee, FL
    No loctite on the threads, no. The bolt does have a locknut that you might want to replace, depending on how flat it's become over the years. I did make use of grey RTV on the bolt and sealant on the outer flange, though.

    See details here in a nice Birdman tutorial (starts around Step #10).

    http://www.birdman308.com/service/cv_joints/cv_joint.htm
     
  5. thorn

    thorn F1 Rookie
    Silver Subscribed

    Aug 7, 2012
    3,324
    Tallahassee, FL
    Edit: lock WASHER, not lock nut.
     
  6. 328GTB

    328GTB Formula Junior

    Jun 4, 2002
    305
    Texas, USA
    Full Name:
    Carmine
    Got it. Been using Birdman's write up. Would be nice to know why the WSM manual is confusing.
     
  7. ferrariowner

    ferrariowner Formula 3

    Feb 21, 2014
    1,155
    Mansfield, TX
    Full Name:
    Ron
    I think the reason the WSM is so confusing is that it was originally written in Italian and translated to English by someone who didn't speak English:)
     

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