I'm a little confused about the torque procedure for the 912 heads. SI-912-025 https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912-025.pdf has a date of 30 Dec 2016.  There is also a video about this https://www.rotax-owner.com/en/videos-topmenu/expanded-video-instructions/463-new-torque    Both of these show torquing in the proper order to 90 in-lb, then 265 in-lb.  Next in order you loosen 360 degrees, torque to 90 in-lb, and then tighten an additional 150 degrees.  

The heavy maint manual shows a different sequence where you torque in order to 90 in-lb, then add an additional 120 degrees.  The confusion comes from the dates.  In the listing for the manual download shows Ed. Rev 6, July 1, 2018, which would be AFTER the SI-912-025 bulletin.  On the actual heavy maint manual document that gets downloaded, the bottom of the pages show Ed 1 Rev 4, Feb 01, 2015 and which would be BEFORE the SI bulletin.  The revision pages document shows Ed 1 Rev 6 and July 01, 2018.  There is a note that torque angle was changed from 180 deg to 120 deg 2-1-2015 which is of course before the SI bulletin.

My best guess is that the heavy maint manual may have some revisions up to July 1, 2018, but not all information is updated to that time.  The head torque for example appears to only be updated to 2015 in the manual.  If this is all correct, then the SI-912-025 bulletin is the latest documentation for head torque.  I'm going to used the SI bulletin and video unless I hear otherwise. 


Rusty (damn this is confusing)


PS- I got confirmation that the proper procedure is still to follow SI-912-025.  I would have just deleted the post if it would have let me.

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