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Fork cap torque?

Discussion in 'Chat & Tech Info' started by Vintage Don, Oct 8, 2019.

  1. Vintage Don

    Vintage Don Just got it firing!

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    Hi, I've been following a thread on Face book regarding torquing of the fork caps.. All the normal sources come back with a figure of around 120Nm upwards. Most of the comments that have come in just talk about nipping up. Whilst I have my own thoughts as to why, does anyone know for certain why Guzzi specify what some believe is a very high torque figure?
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    The biggest issue is terminology. That high torque they are quoting is for something else. I've checked several manuals and they say tighten to appropriate torque for the caps, but that torque value is never provided, the same as alternator belt tension and head torque beginning value. So answer is the manuals suck, just get them snug, the upper pinch bolt also clamps the tube which helps to retain the cap. Wrench art is your friend for many fasteners on these bikes.
     
    scottmastrocinque and jr1967 like this.
  3. Vintage Don

    Vintage Don Just got it firing!

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    I appreciate your comment John. The odd thing is that similar torque values are quoted for other makes with conventional forks so I'm thinking surely they haven't all got terminology mixed up and /or all the manuals are incorrect? One other comment I'm not sure 2 m8 fasteners in an alloy triple clamp can provide sufficient force to effectively crush the steel fork tubes onto the caps. The hoop stress you would need to generate that would have to be enormous and way beyond the tensile stress of m8 fasteners.
     
  4. V700Steve

    V700Steve High Miler GT Contributor

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    I snug them w/ 1/2" breaker bar, they have an oring at the top, I haven't had one loose oil yet. 50nm would be plenty.
     
  5. Vintage Don

    Vintage Don Just got it firing!

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    Thanks Steve, My query is just because I don't fully understand why Guzzi quote such high torque figures not that I have an issue how to install them. Many folks just snug them up but there must be a reason why Guzzi stipulate the figures they do for this particular assembly. I'm just curious in understanding the reason and hopefully someone on this forum will have the answer. Cheers.
     
  6. scottmastrocinque

    scottmastrocinque High Miler GT Famiglia

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  7. Vintage Don

    Vintage Don Just got it firing!

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