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Sodium filled valves, 914 vs 915.

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1 week 2 days ago #21100 by nomie
Sodium filled valves, 914 vs 915. was created by nomie
My first post here since I'm a new Rotax 914 owner!

And I can't believe my (bad) luck so far.

Firstly it turned out I need a new block and overhaul kit for my engine. And after waiting the required twelve weeks for the kit from Rotax, they send my an overhaul kit containing the 'faulty' sodium filled valves :(
The bulletin literally came out on the day I received the overhaul kit.

At first the mandatory ASB required all of these valves to be replaced by the previous solid valves, but I see now they softened their stance on the 914 engine:

Revision 1 (06-Dec-2018) of this ASB states that only 914 (Series) engines may optionally elect to replace the affected valves with Solid exhaust valves P/N 854111.
All 915 (series) engines must replace affected valves with new sodium exhaust valves P/N 854114.


Now my question is why does the valves need to be replaced in the 915 engine but not the 914 engine? I thought the engines are relatively similar at a basic level? If I install these sodium filled valves in my 914 I will always have some unease knowing that just perhaps these valves will let go at some point :ohmy:

p.s. I posted in the general section as the topic spans both the 914 and 915 engine.

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1 week 1 day ago #21109 by admin
Replied by admin on topic Sodium filled valves, 914 vs 915.
Currently, ALL of the P/N 854113 sodium filled valves are being replaced out of an abundance of caution. You MUST NOT use any 854113 exhaust valves, in any engine.

If you have a 915, you must wait for the new P/N 854114 sodium filled valves, and replace only with them.

If you have a 914, you have the option of waiting for the new 854114 sodium filled valves, and replace with them - OR - you may replace 854113 valves with the original-type 854111 'solid' exhaust valves.

Basically, 914 can use either 854111 or 854114... but the 915 is spec'd to only use sodium filled valves, thus only the 854114 - now that all the 854113 are being retired as a precaution.

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1 week 1 day ago #21111 by drthomasd
Replied by drthomasd on topic Sodium filled valves, 914 vs 915.
Does anyone have knowledge of the time frame for the availability of the new sodium valves?

Thanks,

Tom

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1 week 1 day ago - 1 week 1 day ago #21116 by RobSeaton
Replied by RobSeaton on topic Sodium filled valves, 914 vs 915.
EASA just released an emergency AD.
It allows 10hrs of flight (the ASB does not)
see attached.

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Last edit: 1 week 1 day ago by RobSeaton.

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1 week 18 hours ago #21118 by nomie
Replied by nomie on topic Sodium filled valves, 914 vs 915.
Thank you. The wording was not very clear to say the least!

Sounds like I am not flying this year again then!

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1 day 5 hours ago #21175 by drthomasd
Replied by drthomasd on topic Sodium filled valves, 914 vs 915.
I thought I would ask again if anyone might have an idea how long it will be before we see new exhaust valves. I have a newly completed gyroplane sitting in Italy. Wondering if I should start a new project while waiting!!

Tom

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18 hours 54 minutes ago #21178 by Roger Lee
Replied by Roger Lee on topic Sodium filled valves, 914 vs 915.
You would need to call a service center.
Most of these engines are all the 915's and the the 914's from this year. If you own either engine you need to look at your serial number to make sure.

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