Engine Mounting Bolt Torque

It seems that the 912iS manual may be incorrect and not updated regarding the bolt torque specification and the inclusion of Loctite. The Rotax 915iS manual reflects what the 912 and 914 manuals state for the bolt torque (60 NM) and the use of Loctite. The correct torque specification is 60 NM, and it should be accompanied by the use of Loctite 243.

We have also encountered a similar issue with the valve cover bolt torque specification for the 912iS. 

Thanks for the reply.  I used the more conservative 40 Nm value during my condition inspection and was already afraid I was going to break them.  Guess I’ll have to trust the engineers.

And if you want to add another inconsistency to your list, see my recent post questioning exhaust pipe flange nut torque.  MMH shows 12 Nm and the IM shows 15.

Sorry, but I have to ask a follow-up question in your response regarding the valve-cover bolt torque.  Once again there is an inconsistency between the ULS 10 Nm and the iS 12 Nm torque recommendations.  The M10 engine-mounting bolts are much larger than the M6 valve-cover bolts, so would expect them to have a higher torque value, so, can you confirm Rotax is really recommending the same 60 Nm torque value to be used on these smaller valve-cover bolts?  That’s just a very large change.  Thanks in advance for humoring me.

I apologize for any confusion caused by my previous response (I made edits to ensure clarity). My intention was not to imply that the valve cover bolts should be torqued to 60NM. Instead, I was referring to the fact that we have come across inconsistencies in torque specifications between different manuals.