Valve cover gaskets-912ULS

by in 912 / 914 Technical Questions 9 years ago

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Re: Valve cover gaskets-912ULS

by Rob Seaton » 9 years ago

Rob Seaton

3 1.32k 240

For the valve cover question the IPC and Heavy Maintenance Manual agreed so I picked the more authoritative publication to reference; the HMM.
Generally, the rule of thumb is the most recent ICA document, so the IPC is correct for the sprag nut. The HMM will be revised to Loctite 603 and 150Nm.

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Re: Valve cover gaskets-912ULS

by Roger Lee » 9 years ago

Roger Lee

125 5.12k 4.53k

I take back my comment, it was wrong. Sorry.
I deleted that post so it won't be confusing to anyone.

Here is the reply I got from up above.

"The problem is that it has always been 10 nM. When they changed the
material from yellow cad bolts, grade 8.8, the change was to a silver one
with higher grade. These can be torqued to 12nm/105in and at some point
they said that was correct. Later they changed back to the 90 inch lbs/10
nm, to avoid any confusion of people having to identify the type of bolt.
(grade) 12nm is too high for the yellow cad grade 8.8 bolt."

So 10nm or 90 in/lbs is correct.

The Heavy on the 912is has 12nm.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Valve cover gaskets-912ULS

by Conrad Beale » 9 years ago

Conrad Beale

3 66 22

Rob,
How does any one know what the latest torque is without going through each relevant page of the IPC, each relevant page of the HMM, every relevant page of Service Bulletins, Service Letters,and Service Instructions and then checking the issue date of each page and using the figure off the latest document.
Is there not a better way?
I must apologise to you as I know this is not your making, but I just dont know how the engineers in the field are supposed to keep up. I mean Roger made a mistake on the rocker cover torque, probably because the 912iS is different torque to the 912ULS.

Thank you for your continued support and valued feedback.

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Re: Valve cover gaskets-912ULS

by Rob Seaton » 9 years ago

Rob Seaton

3 1.32k 240

Dear Conrad, now that you have me in the corner, keep swinging
There is no easy way, yet.
Rotax or any manufacture cannot publish a new manual revision for every small change so the temporary revision, Service Instruction, Service Bulletin, Service Letter system is used depending on the severity and application. Eventually the information is captured in the maintenance manuals and the temporary system is rescinded.
The Parts catalogue (IPC) is not the correct manual for the torque values but when that feature was removed many years back the yelling and screaming was so loud they had to re-introduce it. And justifiably so, it is so darn handy...

Yes we need an app for torque values. The suggestion has been made.

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Valve cover gaskets-912ULS

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