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912 Bed-Mount bolt torque

 
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edflys2



Joined: 21 Nov 2018
Posts: 1
Location: Lethbridge, AB

PostPosted: Thu Nov 22, 2018 8:10 am    Post subject: 912 Bed-Mount bolt torque Reply with quote

Have a 912ULS configured with a bed mount. I am trying to determine the correct torque for the cap screws that hold the Zenair steel Angle Brackets to the bottom of the crank case (Sonex call them "Engine Mount Attach Bars"). I find various recommended torque values for the M8 cap screws as high as 26 ft lbs, which seems high for a bolt screwed into an aluminum crank case.

Any advise appreciated.
Tnx
Ed


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rickofudall



Joined: 19 Sep 2009
Posts: 1342
Location: Udall, KS, USA

PostPosted: Fri Nov 23, 2018 6:14 pm    Post subject: 912 Bed-Mount bolt torque Reply with quote

If it's a 8 X 1.25 that's close to a 5/16-18 for me and I wouldn't go beyond 14 ft lb and use Loctite 243 to keep it tight. The HMM specifies 17.7 ft lb for unlisted M8. I guess that gives you 16 ft lb +/- 1.5 ft lb. :-}.

Rick
On Thu, Nov 22, 2018 at 10:15 AM edflys2 <edkalau(at)shaw.ca (edkalau(at)shaw.ca)> wrote:

Quote:
--> RotaxEngines-List message posted by: "edflys2" <edkalau(at)shaw.ca (edkalau(at)shaw.ca)>

Have a 912ULS configured with a bed mount. I am trying to determine the correct torque for the cap screws that hold the Zenair steel Angle Brackets to the bottom of the crank case (Sonex call them "Engine Mount Attach Bars").   I find various recommended torque values for the M8 cap screws as high as 26 ft lbs, which seems high for a bolt screwed into an aluminum crank case.

Any advise appreciated.




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PostPosted: Mon Nov 26, 2018 6:39 am    Post subject: 912 Bed-Mount bolt torque Reply with quote

My 701 uses the bed mount also. The only reference I can find is in my
old Rotax Heavy Maintenance Manual. 71-00-00. Page 20. Paragraph (6.1.3)
May 01/2007. It's for a dynafocal mount. But it is using the same bolt
holes as the bed mount. 29.5 ft. lbs. Also specifies that these should
be 10.9 strength bolts. I recently replaced my M8 bolts after about 1500
hours on them. Finding this reference was why I changed them.


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