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Friction Torque check

in 912 / 914 Technical Questions 9 years ago
Sorry, but I am lost ! (in translation may be! Because I am French?...)

I would like to check the "friction torque", that is mean the necessary torque to move the blade within the "free 0-30°" (when the 912 is clutch equipped and the crankshaft locked).

-In the video, you mentionne a torque [200-300] in.lb, that is mean [22.6-60] Nm (without any conversion mistake)
-But, in the Maintenance Manual, I see [600-800] Nm (I try to attached pages 5-6, from chapter 05-50-00, Sept 2012) and also max. 150 Nm (on the same Maintenance Manual, page 22, from chapter 05-50-00)

1-So, what are the correct limits?
2-What are the meaning of the torque check of the attached pages of the Maintenance Manual (overload clutch and maximum occuring torque)

Thanks in advance for support.
Overloadclutch.pdf (You do not have access to download this file.)
Maxioccuringtorque.pdf (You do not have access to download this file.)

  • Re: Friction Torque check

    by » 9 years ago

    Hi Eric,
    look in the Line Maint. Manual section 12-20-00 page 67. Close to the last page.
    The torque amount is between 30-60 NM or 22-44.3 ft/lbs or 264-531 in/lbs.


    Did this help?

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: RotaxOwner Admin
      
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  • Re: Friction Torque check

    by » 9 years ago

    OK, thanks.

    -i have mesured #100 Nm, which is too much so (under ambiant temperature #10°C, engine not warm); What do you recommend me to do? What is the risk?
      
    Report

  • Re: Friction Torque check

    by » 9 years ago

    Hi Eric

    You need to understand what it is you are doing.

    The 600-800nm torque is the slipping torque of the slipper clutch which you do not need to measure and you need a special jig to measure it when you do, so forget that one.

    The 150nm torque is the maximum amount of torque allowed to turn the crankshaft. Some of the older engines have problems with the crank cases fretting and tightening up on the crank shaft, making it difficult to turn.

    The torque setting you are looking for is 30-60nm, and is the torque required to move the prop through 30 degrees, which is the movement between the driving dogs in the gearbox. To do this you need to lock the crank shaft with the special crank shaft locking pin and use a spring scale attached to the prop to measure the force required to move the prop. Make sure you can move it 30 degrees back and forward before you start, so you know it will move. I will guarantee you won't be doing it right if you are getting a reading of 100 nm.

    Check what you are doing or you will cause a lot of expensive damage, or leave it to someone who knows.

    Good luck

    Mark
    Thank you said by: RotaxOwner Admin
      
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  • Re: Friction Torque check

    by » 9 years ago

    To make sure we are on the same page go to the "Line Maint. Manual" section 12-20-00 page 67. I think you are trying to do the overload clutch breakaway torque and not the friction torque check for the gearbox. I wouldn't do the overload break away check because you could bend the engine mounts unless the engine has some exterior bracing.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Friction Torque check

    by » 9 years ago

    Sorry, I have measured 100 N but at 0.50 m from prop. axe, means 50 Nm
    So, right in the middle of the range.
    Thanks for your support guys!
      
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