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Torque Settings For Flywheel Bolts

Discussion in 'Technical Help' started by comfysofa, Mar 11, 2020.

  1. Does look the nuts.
     
  2. Looking at the picture of the holding tool, does it not reach the rear bolt hole in the case if the bolt is backed out, & couldn't you get both screws in? I had to modify screws on the one i bought for it to all align.
     
  3. Yeah - i did - it was cerakoted but for whatever reason it reacted with the magnesium...no idea why as the other side is still perfect....
     
  4. I was looking at it this morning thinking just that....ill have a go at adjusting it tomorrow...thankyou sir for confirming what i was thinking...
     
  5. Didnt realise it was mag, ah, Sp
     
  6. Got back from Rich's (louigi moto) just had a bit of a lesson from the master....took the clutch sprag apart again....watching him doing that - now i know how to do it...! - heres some pics of the upgrade - apparently he does this to all engines he pulls apart...the sprung band is removed...

    20200320_173943.jpg
     
  7. And this is what happens to the metal band....where the engine heats up and cools down apparently the band stretches and goes baggy...like this...the rubber band (a ducati part from somewhere else on the bike) fits perfectly..and, so Rich says, lasts indefinately...!
    20200320_174000.jpg
     
    #48 comfysofa, Mar 20, 2020
    Last edited: Mar 20, 2020
  8. I

    Torque values for small stuff always seem low until you to the calcs. Your M6 screws at 13Nm will each exert a force of around 1kN. The rough calc (for what we're talking about here) is:

    Force = 5 x Torque / Dia, so for Newton-metres we get 5 x 13 / 0.06 = 1083N

    This is why it's so easy to strip an Aluminium female thread with a steel bolt cos the forces are so much higher than you think. There's more detail to this as you can imagine...
     
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  9. So, at last after 3 weeks of waiting, dropping stuff off, collecting it blah blah blah....i...."should" be able to get it all back together on the weekend...
     
  10. Interesting, as the 'rubber' band will heat cycle as well. Wonder how long they last?
     
  11. Cheers, although this time (earlier on) rich torqued them up....

    What im dreading is the 300+NM ive gotta put on that flywheel nut! the torque wrench i borrowed from the lad at work is about 2 1/2 ft long....
     
  12. Rich says he not had to change one yet...
     
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  13. Yup scary! I've designed a lot of bolted machinery. It's fascinating and something that most engineers know nothing about!
     
  14. You might want to put something like an axle stand under the head of the torque wrench as you're leaning into it with all you've got!
     
  15. Thanks...(you really have to pull on it that hard then...?!!)
     
  16. Hernia level I'd say:tired_face:
     
  17. Jesus - i feel like the crank thread would strip...!
     
  18. Trust the numbers... I can come round and give moral support (keeping my distance obviously) me babber!
     
  19. Be interesting to know what the rubber band comes from, it looks a bit like the viton fuel pump seal from the 748/916 bikes.
     
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