Does tightening torque = loosening torque?
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  1. #1
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    Does tightening torque = loosening torque?

    Say you're about to remove and reinstall a fastener but don't know the torque spec. If you slowly removed the fastener with a beam torque wrench, watching the dial as you swung the wrench, would the max torque that you read be the correct torque to use to reinstall the fastener?

  2. #2
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    Only if it was correctly tightened in the first place. You'll end up getting really close to the torque is was tightened to but who knows if it was the 'correct' torque.
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  3. #3
    tlg
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    Nope. Absolutely not.

    Loosening torque is 'usually' less. But it can me more, especially if it's been tightened for a period of time, you have to overcome corrosion, dirt, grime, etc.

    https://www.nord-lock.com/insights/b...-untightening/
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  4. #4
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    Quote Originally Posted by tlg View Post
    Nope. Absolutely not.

    Loosening torque is 'usually' less. But it can me more, especially if it's been tightened for a period of time, you have to overcome corrosion, dirt, grime, etc.

    https://www.nord-lock.com/insights/b...-untightening/
    What he said. Add that many bolts also have loctite or similar, and the type used can also differ in the amount of torque required to break free. Additionally bolts can stretch over time, that would also result in different torque values. I don't think bikes use TTY bolts (Torque to Yield, aka stretch bolts, they are one time use only, my Mercedes had these for the transmission pan.. needed like 16 of them at $3 a piece.. for a freaking bolt...)
    Some also have a torque value as well as a degree value, aka torque to 5NM + 90 degrees.

    Basically.. figure out what the torque values are before you start taking things apart.

  5. #5
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    Quote Originally Posted by ljvb View Post
    What he said.
    Thanks for the responses. I also got thoroughly schooled on this on the classic VW forum I belong to!

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