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Torque Rating On Transfer Case Cover

Discussion in '308/328' started by canadiantifosi, May 15, 2012.

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  1. canadiantifosi

    canadiantifosi Formula Junior

    Jul 2, 2008
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    Canadian Tifosi Sr.
    #1 canadiantifosi, May 15, 2012
    Would be of help if someone could post the torque rating for the ten nuts holding the transfer case to the bellhousing.

    Have a tiny oil leak and want to check their torque in case they have loosened up over the past couple of years.

    The car is an '82 308GTSi.

    Cheers-Colin Firth
    Ontario Canada
     
  2. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,321
    UK
    #2 Iain, May 15, 2012
    They are std M8 nuts I think so around 18 lbft from memory. There is no gasket there, its usually sealed with an anearobic sealer - something like Loctite 518.
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    #3 Steve Magnusson, May 15, 2012
    See Chapter M in the 308GT4 WSM (which you can download at www.ferraridatabase.com). If the stud size is M8 x 1.25P, I believe the specified value is 2.5 Kg-m (the translations aren't always clear so always good to use the thread size as a double-check).
     
  4. Iain

    Iain F1 Rookie

    Jan 21, 2005
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    #4 Iain, May 15, 2012
    The WSM does seem to specify 2.5kgm for most of the M8 x 1.25 stuff (which is 18lbft). Out on the web, a number of references to "standard" torques settings of 24/25lb ft for that size & thread. Wonder why the Ferrari spec is less than that?
     
  5. canadiantifosi

    canadiantifosi Formula Junior

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    #5 canadiantifosi, May 15, 2012
    Last edited by a moderator: Sep 7, 2017
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #6 Steve Magnusson, May 15, 2012
    Last edited: May 15, 2012
    The torque values have to take into account the materials and the arrangement -- e.g., a steel bolt and steel nut (or a steel nut on a steel stud mounted in a steel base) will have a higher failure load than steel bolt and an aluminum nut (or a steel nut on a steel stud mounted in an aluminum base).

    In this case, the (lower) Ferrari limit is set by pulling the steel stud out of the aluminum base (not the failure of the steel threads nor steel stud). The chart posted by Matt is based on fastener load = 75% proof load of a lower grade bolt (IIRC, no markings = wimpy ;)) so those torque values are "derated" for a different reason.
     
  7. canadiantifosi

    canadiantifosi Formula Junior

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    #7 canadiantifosi, May 15, 2012
    Found the leak. Looks like a pin hole in the bottom of the oil cooler where it sits above the transfer case. I started the car and gently lifted up the base of the oil cooler where it was touching the transfer case and saw drops of oil coming out. Musta vibrated a little hole where it contacted the transfer case bolt casting.

    Looks like I will be taking off the oil cooler and seeing if my rad shop can patch the leak.

    Anyone have any experience with repairing tiny leaks on 308 oil coolers?

    Colin
     
  8. Matto

    Matto Formula 3

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    #8 Matto, May 15, 2012
    I was just going to ask if you'd checked the oil cooler itself :) Glad that it was an easy find.
     
  9. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    #9 yelcab, May 15, 2012
    Forget it, buy a new one. Most radiator shops will not touch that.
     
  10. canadiantifosi

    canadiantifosi Formula Junior

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    #10 canadiantifosi, May 17, 2012
    Picked up another oil cooler. Had my local rad shop repair the old one so I now have a spare.

    Thanks-Colin Firth
     
  11. Matto

    Matto Formula 3

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    #11 Matto, May 17, 2012
    I'm glad that it was a simple fix and that it worked out.
     
  12. canadiantifosi

    canadiantifosi Formula Junior

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    #12 canadiantifosi, May 19, 2012
    Installed the new (used) oil cooler today and ran it through a couple of heat cycles and 20Km run. No drips, no leaks.

    Thanks to my buddy Veet (Vito) for picking it up for me from Roc's in Toronto.

    Cheers - Colin Firth
    Ontario Canada
     
  13. robertgarven

    robertgarven F1 Veteran
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    Feb 24, 2002
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    Robert Garven
    #13 robertgarven, May 20, 2012
    Wow,

    I read this post last night and thought it could have been a hose then went to dinner and after driving the GT4 yesterday trail of oil into the garage and about a cup or two under the car looks like oil radiator is failing too. Can I ask where you found the new one? It looks like the old 016965 has been SS to 145712. Is this what you got and is it the same as I dont want to do any modifications unless necessary....

    Rob
     

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