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Hi,

I have old 912uls (12 years old).

How much should I need to tighten the 4 bolts 20/40/60 Nm?

  • Re: Engine attach bolts - torque

    by » 5 weeks ago


    Hi Gil

    look in the heavy maintenance manual, section 71.  Rotax only uses a ring mount and you need to have the correct value of the bolt however remember this is based on a full contact length of 25mm (1 inch) into the block threads.  Generally the kit manufacturer should also cover this in their manual.  See the highlighted text in attachment. 

    Cheers

    39188_2_mount torque.jpg (You do not have access to download this file.)

  • Re: Engine attach bolts - torque

    by » 5 weeks ago


    Interestingly, there has just been a service bulletin on my Eurostar airframe with the 912UL engine when torques have been specified as 40Nm but this does not use the Rotax mounting frame.


  • Re: Engine attach bolts - torque

    by » 5 weeks ago


    Hi,

    Im asking for the 4 bolts as shown on the attached pic.

    39192_2_20240409_153945.jpg (You do not have access to download this file.)

  • Re: Engine attach bolts - torque

    by » 5 weeks ago


    Hello again Gil

    The 4 you show are not part of the Rotax supply and therefore would be called out by the OEM or kit supplier.  Rotax does not know everyones isolator make and size.  If you can't get it from your OEM then use a generic torque value for the size and thread of the bolt and nut.  That information should be available from your bolt supplier. 

    Cheers


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