355 - Dumb question: How tight to install thermocouples? | FerrariChat
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355 Dumb question: How tight to install thermocouples?

Discussion in '348/355' started by Targatime, Feb 6, 2021.

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  1. Targatime

    Targatime Formula 3
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    #1 Targatime, Feb 6, 2021
    Did a ton of searching here and elsewhere and cannot find guidance on this. You press the thermocouple probe through the cat or y-pipe bung till it's all the way in, thread the 14mm collar on by hand, start tightening it with a flare wrench....but how far to go? Seems like a lot more thread there than necessary. The elaborate exhaust electronics and sensors on the 355 have me nervous. Thanks for any guidance.
     
  2. Qavion

    Qavion F1 World Champ
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    #2 Qavion, Feb 6, 2021
    Last edited: Feb 6, 2021
    Couldn't find a torque value for the F355, but I see a value of 10Nm in the F430 manual and 9.8Nm for the F360. i.e. about 7.3 foot/lbs
     
  3. Targatime

    Targatime Formula 3
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    #3 Targatime, Feb 6, 2021
    Thanks Ian. The TC's have a strange feel. I guess another way to ask this is, How deep do you go with the 14mm collar? Until it bottoms out or just a few turns?
     
  4. Qavion

    Qavion F1 World Champ
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    #4 Qavion, Feb 6, 2021
    I see. Do you have OEM thermocouples or universal/adjustable types? (e.g. from Technistrada).

    I haven't fitted either.
     
  5. Beetle

    Beetle Formula Junior

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    #5 Beetle, Feb 7, 2021
    Just firm you are only crushing the compression olive to confirm an air tight fit. If you go to hard you will crush the thermocouple. After a few drive cycles check that there snug.
     
  6. m.stojanovic

    m.stojanovic F1 Rookie
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    #6 m.stojanovic, Feb 7, 2021
    If the nut has not contacted the olive, you will be able to pull the Thermocouple out a bit (and push in). So, turn carefully the nut and check the "play" of the Thermocouple out-in. When there is no more such play, the nut is in contact with the olive. From there, turn another, I would say, 1/4 - 1/2 turn.
     
    Beetle and Targatime like this.
  7. taz355

    taz355 F1 Veteran
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    #7 taz355, Feb 15, 2021
    Don’t forget anti seize as in 5 years it will make dismantle easier
     
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