355 Alternator bolt torque | FerrariChat
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355 Alternator bolt torque

Discussion in '348/355' started by Rice-Racer, Mar 3, 2019.

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  1. Rice-Racer

    Rice-Racer Formula Junior

    Jan 10, 2015
    252
    #1 Rice-Racer, Mar 3, 2019
    Changed alternator on my '97 355, and can't find the mounting bolt torque specs, specifically the bottom bolt with the spring on it. Whats the tension on the spring supposed to be, before setting the second locknut?
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,673
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Mar 3, 2019
    I have never seen one come loose. It's M12 bolt, 8.8 grade, I think 45 lb-ft is more than good enough. It has a spring, and second lock nut. How's it going to come loose?
     
  3. Rice-Racer

    Rice-Racer Formula Junior

    Jan 10, 2015
    252
    #3 Rice-Racer, Mar 3, 2019
    I was under same impression, 45-50 lbs
    Was more curious on the spring part, amount of compression it needs, gap between coils maybe.
    Thanks buddy.
    PS- careful whoever rebuilds an alternator for anyone.
    I got hosed out of $300 for a ‘spray bomb’ rebuild, didn’t even separate case, just changed rectifier with some cheesy brand and painted cover. Good ole Vancouver Canada for you.
    Found a great shop in Cali who sent correct bearings, parts etc.Works just like new again.
     
  4. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,288
    Cowboy Capitol of the World
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    Brian Crall
    #4 Rifledriver, Mar 3, 2019

    Not unusual at all.
     
  5. steved033

    steved033 F1 World Champ
    Owner Silver Subscribed

    Apr 12, 2017
    10,364
    Atlanta, GA
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    Steve D.
    #5 steved033, Mar 3, 2019
    How tight? Tight. You know, tight. not loose, not stripped. won't come off till you want it off. tight.

    :p:p
     
    ernie likes this.
  6. Rice-Racer

    Rice-Racer Formula Junior

    Jan 10, 2015
    252
    #6 Rice-Racer, Mar 3, 2019
    I hear you, thanks guys, common sense approach, just want to make sure I got it right the first time is all.
     
    steved033 likes this.
  7. steved033

    steved033 F1 World Champ
    Owner Silver Subscribed

    Apr 12, 2017
    10,364
    Atlanta, GA
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    Steve D.
    #7 steved033, Mar 4, 2019
    IMO, things with gaskets need torque spec so it evenly loads the gasket. oil pans, the front cover, valve covers...stuff like that.. all the other stuff, just make sure it doesn't come loose. The majority of nuts on my 348 are nylon locking...they're likely not coming off..

    sjd
     

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