Exhaust flange spring bolt tension | FerrariChat

Exhaust flange spring bolt tension

Discussion in 'Technical Q&A' started by alex360S, May 10, 2020.

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  1. alex360S

    alex360S Formula Junior

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    Alex
    I have looked over the forum and on the net with no clear answer. The 360 manual calls for 75 nm tension on the exhaust flange spring bolts which must be a mistake, the flanges bend under that stress. Can someone please advise how to properly install and tension those spring bolts at the flange joining header and cat.
     
    alex360S, May 10, 2020
    #1
  2. yelcab

    yelcab F1 World Champ Consultant

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    Those long M8 bolts with a spring at one end? 25Nm is all you will be able to get on there. I have always been of the camp "tight enough is enough" on exhaust bolts because it is hard to get a torque wrench in there. I think I always ended up somewhere 15-20 Nm.
     
    yelcab, May 10, 2020
    #2
  3. alex360S

    alex360S Formula Junior

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    Thank you for the reply. I’m currently at 22 nm. Should I slack off a bit to 18 nm?
     
    alex360S, May 10, 2020
    #3
  4. yelcab

    yelcab F1 World Champ Consultant

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    Leave it be at 22. Good enough.
     
    yelcab, May 10, 2020
    #4
    thorn likes this.

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