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JonathanMilbank
Joined: 14 Apr 2012
Posts: 388
Location: Aberdeen area
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 Posted: Wed May 30, 2018 1:53 pm Post subject: Oil tank gurgling (burping) |
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My 912ULS engine has done 250 hours since complete strip-down and rebuild after I bought it from an acknowledged Rotax engine expert. The three friends who share the Europa with me are all happy with how sweetly it runs. The compressions were measured very recently and are excellent (approaching 200 psi). The oil pressure is good being in the vicinity of 4 bar. BUT....
Nine times out of ten the oil drains quickly (overnight) from the tank to a level below the flat on the dipstick. This wasn't always so and has become worse over time. It used to take about a dozen compressions done quite slowly to push the oil back into the tank, while these days it can often take 50 or more compressions. Why?
My imagination is that the oil escapes past the oil pump and the rate of escape depends on the position of the pump lobes when at rest. So if the oil pressure remains good in flight, what's changed? Perhaps the oil pressure relief valve is sticking in some way when the engine's at rest? However I also appreciate that the pump and relief valve may have nothing to do with the problem.
Your experience and knowledge of likely causes would be gratefully received.
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Sat Jun 02, 2018 2:21 pm Post subject: Re: Oil tank gurgling (burping) |
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absolutely normal behavior
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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