sidsel.svein(at)oslo.onli
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 Posted: Tue Aug 21, 2012 9:40 am Post subject: 912ULS engine mount - loose Binx nut |
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Hi all,
Just a word of caution:
The Rotax engine ring mount is bolted to the Europa engine frame with four bolts with M10 Binx nuts (the Binx nut version that is slightly oval inside before screwed on to the bolt, thus having a selflocking function).
Inspecting the engine today, with both cowl parts removed, I discovered that the nut had unscrewed itself so much that I could easily turn the nut and the bolt around (meaning, by the way, that the three other bolts were holding the engine firmly in place). Total 171 hours.
The “Rotax 912S Installation Manual” (my version and also the current one on Europa’s web site) specifies neither a certain torque nor any Loctite on these nuts, indicating that the nuts are assumed to lock sufficiently well. I remember clearly that I called Europa back then, and a very skilled representative of the company confirmed that no specific torque was required, just tighten it.
I certainly hope that my case is unique, but you are all advised to check regularly.
I had to remove the muffler to get to the bolt head at the back. Definitely some restriction to turn the nut on the bolt, but I put on Locktite 270 to be safe (stronger than the Locktite 243 recommended for the ring mount-to-engine bolt nuts).
On the attached photo you will see the marks made with water-proof felt pen on the nut and the ring mount for easy detection of any nut movement, re-drawn after tightening. The marks not lining up is how I noticed that something was wrong.
Fly safely.
Regards,
Svein
LN-SKJ
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