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Re: Europa-List: Gurgling (burping)

Subject: Re: Europa-List: Gurgling (burping)
From: Alan Burrill <alanb@dpy01.co.uk>
Date: Sat, 16 Jun 2018 12:14:18
I assume that you are following SI-27-1997 on checking the oils level.

Personally I check after flight, I let the engine cool a little first, and t
hat usually results in the =9Cgurgle=9D after only a few blades.
 I also check before flight when engine cold but if I=99ve done it aft
er flight the check, when cold, only needs a few blades as all the oil has a
lready been returned to the tank. Never had oil draining from the tank back i
nto the engine.

I have found cold engines will take 10 or 12 blades, sometime more, to get t
he gurgle and this is often when I=99ve hired something Rotax and the p
revious user has not done it warm.

Alan
G-OBJT

Sent from my iPad

> On 16 Jun 2018, at 11:30, "ami-mcfadyean@talktalk.net" <ami-mcfadyean@talk
talk.net> wrote:
> 
> Jonathan,
> 
> How do you know that the oil is draining overnight? Do you check oil level
 immediately after last engine shutdown?
> 
> I ask because I find there is a net drain of oil (from the catch tank) dur
ing any prolonged idle (e.g of a few minutes, and including glide decents) w
here followed by shutdown. Alarmingly so on occasions (to below the minimum d
ipstick mark). Prolonged idle may sometimes be unavoidable during taxiing in
 traffic, or voluntary, such as when allowing exhaust valves/piston rings  (
and turbo?) to cool before shutdown.
> 
> 
> 
> Duncan McF.
> 
> From: owner-europa-list-server@matronics.com <owner-europa-list-server@mat
ronics.com> on behalf of jonathanmilbank <jdmilbank@yahoo.co.uk>
> Sent: Wednesday, May 30, 2018 5:53:47 PM
> To: europa-list@matronics.com
> Subject: Europa-List: Gurgling (burping)
>  
k>
> 
> My 912ULS engine has done 250 hours since complete strip-down and rebuild a
fter I bought it from an acknowledged Rotax engine expert. The three others w
ho share the Europa with me are all happy with how sweetly it runs. The comp
ressions were measured very recently and are excellent (close to 200 psi). T
he 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 w
orse 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 o
r more compressions. Why?
> 
> My supposition is that the oil escapes past the oil pump and the rate of e
scape depends on the position of the pump lobes when at rest. So if the oil p
ressure remains good in flight, what's changed? Perhaps the oil pressure rel
ief valve is sticking in some way?
> 
> Your experience and knowledge of likely causes would be gratefully receive
d.
> 
> 
> 
> 
> Read this topic online here:
> 
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