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Engine attach bolts - torque

in 912 / 914 Technical Questions 12 years ago
Can anyone advise what the torque settings are for the 10mm engine attach bolts. I can't see any reference in my manual.
Thanks.

  • Re: Engine attach bolts - torque

    by » 12 years ago

    Probably HM 00-00-00 10.2
    In general, all screw connections on ROTAX engines must be tightened using a torque wrench.
    If not specified otherwise for a component, tighten screw connections to the following torque:
    M4 : 4 Nm (35 in.lb)
    M5 : 6 Nm (55 in.lb)
    M6 : 10 Nm (90 in.lb)
    M8 : 24 Nm (17.7 ft.lb) M10 : 35 Nm (25.8 ft.lb)
    ■ CAUTION: If not specified otherwise, the threads are not lubricated when fastened.
    ◆ NOTE: Adhere to the tightening torques specified see also indications in the Illustrated Parts Catalog.
    Thank you said by: Chris O'Donnell
      
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  • Re: Engine attach bolts - torque

    by » 12 years ago

    Hi Chris,
    this is a airframe torque as Rotax does no know what you are attaching the bolt to, or how long a bolt you are using. Some bolts go through rubber mounts and others go through steel plates so you can see how many variables there are.
    I bet you aircraft manufacturer has the correct torque for your application.
    Thank you said by: Chris O'Donnell
      
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  • Re: Engine attach bolts - torque

    by » 12 years ago

    Thanks Przemyslaw and Rob.

    Chris
      
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  • Re: Engine attach bolts - torque

    by » 6 years ago

    You might be referring to the 10m engine block attach bolts?  

    If so - exercise extreme caution with torque value charts.  Those charts expect steel nuts and are NOT for a screw going into an aluminum block.  The torque for the four 10m block bolts should be in the maintenance manual and it should be a LOT lower than the torque value published for a 10m bolt/nut combination.   If you strip the block, then you get to learn about heli-coils.   I'm going to look at my maintenance manual later - won't guess here.

     

     

    Thank you said by: RotaxOwner Admin
      
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