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Old 03-26-2018, 11:40 PM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 51
Default Engine Mount to Case Bolt Torque

This has been discussed before but ....can anyone tell me definitively where to find the specified torque. The plans say to see the Rotax Illustrated Parts Catalog. I have searched this document pretty well but can't find it. I think it's 30 ft-lbs based on previous discussions here but would like to see it in writing.
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Old 03-27-2018, 01:49 AM
Vakashi Vakashi is offline
Join Date: Feb 2018
Location: Auckland, New Zealand
Posts: 5

A builder after my own heart - I too like to get it straight from the horse's mouth so that I sleep well at night.
Look in the maintenance manual heavy applicable to the 912ULS in chapter 71-00-00 section 6.1.3 p.20, where is says '6.1.3 Engine suspension frame assembly
See Figs. 71-10 and 71-11.
Screw the engine suspension frame (1) to the engine housing with the
lock washers and the allen screw M10x110 (3) and M10x35 (4),
tightening to 40 Nm (29.5 in each case.'
I installed mine just two days ago and had a **** of a battle for three hours getting the frame over the lower left water pump tube. I had to eventually accept that the powder coating had to be damaged to get it on. The thickness of the powder coating was the tolerance. I touched it up with a dab or two of 2K paint.
You will probably find that a regular torque wrench and allen socket will not fit into the M10 Allen screw above the number four cylinder. I cut a 25 mm length of 8 mm allen key, which I inserted into the M10 cap screw. I then slipped an 8 mm ring spanner over the short length of allen key. I tried torquing the open end of the spanner (compensating for the extra lever arm) but the open end was not up to it and bent open at about 30 Nm (equivalent to about 35 Nm at the M10 cap screw), so I then rigged up a tight fitting pipe over the spanner and suspended a carefully calculated weight at the end of it to reach 40 Nm. Again, I stress that this is what I did, and by no means should this be construed as advice on how you should do it.
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Old 03-27-2018, 11:02 AM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 51

Thanks, found the reference where you said it would be. Good enough for me. I've read here and there in the forum that there is a 25 hour inspection requirement on these bolts. Have you come across that in the Van's or Rotax manuals?

I'm installing the bolts dry as the Rotax documentation doesn't say otherwise and I'm sure the 40NM torque value is based on a dry installation. I needed a washer on the upper left mount. Just the slightest of a gap but was able to get a washer in there by pulling on the mount a bit.
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Old 03-27-2018, 11:07 AM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,873

Checking the bolt torque is on the 100 hour inspection check list (which is prescribed to be done at 25 hrs, and then every 100 hrs after that).

At some point in the past few years, Rotax removed all torque references from the illustrated parts catalog and moved them to the general maint. manuals.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 03-27-2018, 02:57 PM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 51

Thanks Scott.
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