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bshafer708(at)gmail.com
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 Posted: Wed Nov 28, 2012 12:31 pm Post subject: Oil in Turbo on 914 |
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Looking for some advice. My 914 hasn't been run for about 18 months. Oil has
been collecting in the bottom of the turbo. I have the hose between the
turbo and intercooler disconnected and I can suck up oil with paper towels
in that opening. After about 2 months, the oil leaks back in. Any
suggestions on what could be causing this? And can I run the engine with the
turbo to intercooler to intake disconnected? I'm assuming it would just run
like a 912 but not sure. I would only do that for testing.
Thanks,
Brad
Europa XS with Rotax 914
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frans(at)privatepilots.nl
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| Posted: Wed Nov 28, 2012 2:45 pm Post subject: Oil in Turbo on 914 |
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On 11/28/2012 09:30 PM, Brad Shafer wrote:
| Quote: |
Looking for some advice. My 914 hasn't been run for about 18 months. Oil has
been collecting in the bottom of the turbo.
|
This is often the case if you don't run the engine. The turbo is at a
low position, there is a valve in the oil return line but even a tiny
leak in that valve will allow the oil slowly to collect in the turbo.
Best is to run the engine regularly, at least once a month. Not only for
this turbo problem, but also for the rest of the engine.
You can also clean/replace the oil return valve. Ideally it should not
leak oil, but then again, 18 months is a very long time.
| Quote: | And can I run the engine with the
turbo to intercooler to intake disconnected?
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Why would you do that? Get out as much oil as you can with a piece of
transparent hose (stick it in the turbo, close the other end with your
finger, lift it out, take your finger off and the oil runs out of the
hose, repeat this until no oil can be caught anymore). Whatever is left
will then be burned in the cylinders.
Running the turbo without the hose will create a mess and the turbo
might(will?) overspeed. The TCU won't see any pressure in the intake so
it keeps the wastegate firmly closed, so the turbo will get the full
exhaust pressure, and without back pressure on the intake side, it will
spool up very fast, without anything limiting it. I wouldn't dare to
try, not even at idle. The engine is not ment to be run like that.
Frans
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budyerly(at)msn.com
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| Posted: Sun Dec 02, 2012 3:44 pm Post subject: Oil in Turbo on 914 |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Brad,
I agree with Frans. Disconnecting the airbox won't kill the engine, as it will start and run, like and 80 horse, but it is not made for that. (Although I have flown with the turbo inop, but it does take care and knowledge.
First, the oil seep into the turbo is normal and irritating.
Oil will get into the inlet and the exhaust side. Get some mild degreaser or dishwashing soap and water, as you will need it after start. The oil coming out of the exhaust will coat the underside and gear.
If the plane has sat for a few months, pull the air filter, and clean the filter if it is saturated.
Put a small piece of tubing and syringe to suck out the excess oil out of the cool side of the turbo or the carbs and sensors will get an oil bath.
Be sure to burp the engine and it may be wise to pull the top plugs and spin the engine until the oil pressure rises to at least 60 psi or 4 bars and continue cranking for 30 seconds to assure yourself that your lifters have oil in them. If all is well, then install the air filter and start it up and run it at 2200 or so until hot.
Failure to ensure your hydraulic lifters are full and pressurized will result in engine failure. And it is very sudden. The Rotax is a superb engine, but it needs oil and coolant constantly.
Your turbo oil leak is due to the oil ball check in the small line to the turbo. That should be disconnected and cleaned and checked that the ball seats properly into the bolt. Any small corrosion or crud will keep the oil feeding from the tank to the supply side of the oil pump and fill the turbo quite quickly after shutdown. It is nasty to do, but I will put the ball into its seat, roll it around to assure it is seated and blow with my mouth to check the seal. It may look like it is sealed, but small imperfections in the seat will cause a leak. Check that you have the new spring also. Depends on your year model.
If the oil begins leaking out of the sump can, get a gasket set and put in a new O ring and gaskets. Follow the Rotax manual completely and do not over-torque the fittings.
If you intend to not fly your 914 for long periods, you should consider following the procedure for engine storage in the Rotax Operators and line maintenance manuals available on line. Otherwise, things get gummed up, seals will fail in the water pump, gearbox seals will dry out, the gears will corrode, etc. Purge your oil system of all air IAW the Rotax instructions before start.
For coolant I use glycol, but Evans coolant seems to corrode less at the fittings than the Evans. Evans does not seem to transfer heat as fast and with glycol I can keep my temps cooler down here in Florida with our sized radiator and ducting. Up north, Evans is fine.
If you can, run the engine every two weeks to a full warm up and taxi to run up to keep it cleaned out.
The key to a reliable aircraft is to exercise it often, maintain it by the book and do a thorough 25 hour inspection at oil change intervals. If mine sits three to six months, I open the carbs, and do a 100 hour inspection on the engine, because I know it will not be reliable enough to jump in and fly off somewhere.
I put in fresh fuel and oil. Aeroshell Sport Plus 4 semi synthetic is good oil, but it does get gummy with time as any oil does. I prefer Mobile MX4T or Racing T (but only with unleaded fuel) as it is cleaner and lubes very well over time without gumming up, however, it is thin and does fill my turbo quickly after a few days..
Airframe wise:
I keep my battery on a battery tender and take the Odessy to the dealer every couple of years for a deep cycle. Visit the plane every two weeks like visiting an old friend and check it over, fill the tires, and look for leaks. Cycle the battery on and start it up and check all the systems. Then if the sun is shinning, go for a quick flight to exercise your own skills.
Best regards.
Bud Yerly
Tech support.
[quote] ---
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