Any one know the torque specs on these bolts? | FerrariChat
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Any one know the torque specs on these bolts?

Discussion in '365 GT4 2+2/400/412' started by Ak Jim, Jul 11, 2025.

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  1. Ak Jim

    Ak Jim F1 Veteran
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    #1 Ak Jim, Jul 11, 2025
    Image Unavailable, Please Login I have the 365 GTC4 shop manual which isn’t very complete. I was wondering if someone had the torque specifications for these rear cover bolts?
     
  2. Newman

    Newman F1 World Champ
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    #2 Newman, Jul 16, 2025 at 6:56 AM
    In this case the torque value us based on the fastener spec not what its holding together. Look up (on-line) that bolt size, pitch and strength marked on the head to get the torque spec.
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #3 Steve Magnusson, Jul 16, 2025 at 10:43 PM
    The only caveat I'd add here is that the "typical" on-line torque spec for a steel bolt using a steel nut (or threading into a female steel thread) will be much higher than the torque you should use for a steel bolt threading into a female aluminum thread -- i.e., make sure any "spec" you find is for your exact material situation. Often in the WSMs there will be a torque spec given for something else using the same thread size (and the same female thread material) that can be used as a guideline/sanity check.
     
  4. Ak Jim

    Ak Jim F1 Veteran
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    #4 Ak Jim, Jul 17, 2025 at 4:18 AM
    So the 365GT4 2+2 doesnt have a shop manual so people generally use the 365 GTC4 manual and in my opinion that manual kind of sucks. I suppose if you were trained by Ferrari and had worked as a professional mechanic it would be ok. The GTC4 manual gives very few torque specs on any thing.
    So my next thought would be to try to find a manual for a 400. Apparently there are no manuals for 400s but there is a manual for a 400i. I paid to download it and it was missing several sections including in differential section. As I’m not getting any younger I decided to just do some google search’s on 8mmx1.25 steel bolt into aluminum casting and I got numbers between 14-20 foot pounds so I went with 18. Who knows if this is even remotely correct.
     

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