>>I find there is a net drain of oil (from the catch tank) during any prolon
ged idle (e.g of a few minutes, and including glide decents) where followed b
y shutdown. Alarmingly so on occasions (to below the minimum dipstick mark).
<<
The max - min marks in the dipstick only have meaning after the gurgling pro
cess in SI-27-1997 are you doing that first?
Alan
G-OBJT
Sent from my iPad
> On 16 Jun 2018, at 12:14, Alan Burrill <alanb@dpy01.co.uk> wrote:
>
> 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
that usually results in the =9Cgurgle=9D after only a few blade
s. I also check before flight when engine cold but if I=99ve done it a
fter flight the check, when cold, only needs a few blades as all the oil has
already been returned to the tank. Never had oil draining from the tank bac
k into the engine.
>
> I have found cold engines will take 10 or 12 blades, sometime more, to get
the gurgle and this is often when I=99ve hired something Rotax and th
e previous 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@tal
ktalk.net> wrote:
>>
>> Jonathan,
>>
>> How do you know that the oil is draining overnight? Do you check oil leve
l immediately after last engine shutdown?
>>
>> I ask because I find there is a net drain of oil (from the catch tank) du
ring 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@ma
tronics.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)
>>
uk>
>>
>> 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 other
s who share the Europa with me are all happy with how sweetly it runs. The c
ompressions were measured very recently and are excellent (close to 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 becom
e worse over time. It used to take about a dozen compressions done quite slo
wly to push the oil back into the tank, while these days it can often take 5
0 or 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 receiv
ed.
>>
>>
>>
>>
>> Read this topic online here:
>>
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