fbpx

 

I removed a head recently to repair an oil return tube and one of the headbolts came out completely. I cant find any reference in the maintenance manual relating to replacement process. Can someone point me in the right direction please. Attached picture shows the bolt. Thanks

7949_1_912 uls head bolt.jpg (You do not have access to download this file.)
  • Re: 912ULS Headbolt replacement

    by » 5 months ago


    8 Nm ( 70 in.lb )


  • Re: 912ULS Headbolt replacement

    by » 5 months ago


    Excerpt from the HMM Section 72-00-00, Chapter 3.16.4, Page 92.

    "...Tighten to 10 Nm (90 in.lb) and then in addition tighten further by applying a 120° rotation ..."

     

    You will need to loosen BOTH Heads and use the cylinder alignment tool and perform the 8-Bolt tightening sequence. 

    This is Not a Plug and Play Procedure.

     


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Victor Ian

  • Re: 912ULS Headbolt replacement

    by » 4 months ago


    I thought it was for a stud........looking at the picture (headbolt)


    Thank you said by: Victor Ian

  • Re: 912ULS Headbolt replacement

    by » 4 months ago


    Yep headbolt, there is white paste on the middle of the bolt which I guess is anti seize but there is no reference to that in the manual (that I could find), what is the process there? Only the head removed not the cylinder. I've read page 92 but my issue is putting the whole bolt back in, I haven't had a bolt come out like that before and this is the bit I can't find a reference for. Thanks


  • Re: 912ULS Headbolt replacement

    by » 4 months ago


    in fact,the part is called ' STUD ' in the Parts manual

     

    an old Part manual that I have prescribe a torque of 3 Nm ( 26 in.lb )

    see parts # 27 & 28 on attached drawing

     

    although, the shorter stud [ part # 6 o   drawing ) is prescrib a torque of 8 Nm (70 in lb)

     

    the actual IPC  (parts catalog ) doesn't show the torque.. I think it is in the Overhaul Manual

    in fact, it is in my old one...

     

     

     

     

    25984_2_912 stud.JPG (You do not have access to download this file.)

You do not have permissions to reply to this topic.