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G On 03/10/2015 5:13 PM, "RotaxEngines-List Digest Server" <rotaxengines-list@matronics.com ([email]rotaxengines-list@matronics.com[/email])> wrote:[quote]*

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Hi Guys,
My Rotax 912 uls oil changes every 50 hours max, and plugs, little 100 avgas mostly premium unleaded, 1074 hours suddenly vibrates at 3000 revs.

gearbox cogs replaced... all good!

Do ...

Hi All,
For the record I've had a nasty vibration creeping into a good flight at 3000 revs in a 912 uls rotax engine with 1066 revs on the clock. It began to also sound a little rough at idle, but 3 ...

Thanks guys for tips. I'm inclined to think the oil and dust is better than embrittlement. (Nice term! ) I'm not being compromised on the cooling process, so it is only cosmetic, and to see if there a ...

Hi All,

I'm after some tips on how we clean oil cooler/ radiator fins of accumulated gunge ie fine coating of oil from oil change drips mixed with dust. Even though cooling is the least of my worri ...

Hi All,
I was hand turning the prop to try and get a gurgle, and was up to 120 revolutions of the prop when it struck me that the line back to the tank must be blocked. Well it was, but by the obscu ...

aha.. good point Thom. I only do this to purge lines up to crankcase. Good point for checking oil level however!

cheers

Geoff

Hi Roger,

Yes , very cautious about air in the lines! One thing I do is take all the spark plugs off so there is no compression when I change the oil and a half filled filter, and repurge the line ...

The great thing about living on the darkside of the world is when I post a question in our time, I wake to all this sea of knowledge, thanks again for your replies.
Thom.. no sign of oil anywhere on ...

Hi All,

I have a 912 uls that has cracked the 1000 hours, and have noticed a change in the way the oil lies in the scavenger tank. An oil check after shut down registers the level well below the l ...

Hi Johanne, I had a vibration problem at similar revs to you (5000) but not as bad in a 912uls. Having tried everything on the engine and gearbox I focused on the prop (thanks to Roger). It turned out ...

Hi Doug,

Have you tried a diferent Prop. I had the oppertunity to try some diferent props a few years ago, and each caused a diferent rough spot in the engine. Worth a go to eliminate that a ...

Hi All,
Roger, I was interested in your comment about 91 fuel storage issues after 1 month. What actually happens to it in terms of breakdown, and what will that do to engine/carby?

regards
Geoff ...

Hi Roger,
Thanks for the info. My curiosity will get the better of me, so I will try a .5 addition, just to see.

Cheers
Geoff Bell

Hi Roger et al

Great thread!
I’ve just put on a new Bolly Prop 3 blade to a STOL a/c T/O about 38kts and max cruise about 75kts, and am currently straight and level WOT at desired altitud ...

Hi George,
My 912 was exhibiting the same symptoms. Finally tightened all the hose clamps and problem was solved. No sign of a leak on the ground, but that was what was wrong in this case. Worth a tr ...

I have witnessed the Lexan/fuel (avgas) mix first hand. The effect was instant, with the windscreen cracking and weakening. it was a tiny amount, hot day, bingo! It could be duct taped to take it home ...

Rick,
I was referring to the $1.55 special as attachment in Craigs post. I used Dextron 3 as the oil inside the tubes. Very accurate and highly visible when its all happening!.
regards
Geoff

Craig,
I have been using this tool for some time now and can report it is very accurate, cheap, and easy to use. Don’t rest the hoses on your windscreen as the pulses through the engine will ...