F355 6-Speed Gearbox Inspection Cover Nut Torques | FerrariChat
Buy

F355 6-Speed Gearbox Inspection Cover Nut Torques

Discussion in '348/355' started by The Outcast, Aug 23, 2011.

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

  1. The Outcast

    The Outcast Formula 3

    Apr 19, 2011
    1,562
    Royal Oak Michigan
    #1 The Outcast, Aug 23, 2011
    Reaching out to the community:

    I recently installed new gaskets on the small (4-nut) inspection covers (clearly visible from under car) of the F355 gearbox, and they are leaking worse than before. All surfaces were microscopically clean before application of the gaskets, covers, and nuts.

    I tightened nuts to 10 lb-ft, and at this point I fear that I have over-tightened them. If anyone knows the specific torque for these nuts, please let me know.

    Thanks!!
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,584
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Aug 23, 2011
    Those small 6mm studs with the nuts on them? 10 ft-lbs is way too much. Try 6 N-m. Don't they have ny-lock nuts anyway?
     
  3. The Outcast

    The Outcast Formula 3

    Apr 19, 2011
    1,562
    Royal Oak Michigan
    #3 The Outcast, Aug 23, 2011
    Thanks for the input. I think you're correct. The nuts are not nylock; they're equipped with crinkle washers. I'm pretty sure I screwed the pooch on this one and now I'm going to pop for new gaskets and do it again!!
     
  4. The Outcast

    The Outcast Formula 3

    Apr 19, 2011
    1,562
    Royal Oak Michigan
    #4 The Outcast, Aug 23, 2011
    I backed off the nuts to "hand-tight" torque, and presto...no more leak!!

    Thanks Yelcab!!
     
  5. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
    Full Name:
    Pap
    #5 PAP 348, Aug 23, 2011
    Sometimes when you over-tighten paper gaskets they can leak because the gasket is "squeezed" out. :)

    Good to hear it was an easy fix and you didn't have to replace those gaskets. :)
     
  6. The Outcast

    The Outcast Formula 3

    Apr 19, 2011
    1,562
    Royal Oak Michigan
    #6 The Outcast, Aug 23, 2011
    Thanks Pap!! Yep...I think I caught it in time before they took a set. Didn't have to do this one twice like the output shaft seal!!
     

Share This Page