Alan,
I think you've missed my point, which was about how far the oil can drain d
own during certain aspects of normal use. Of course there is a procedure to
follow for reinstating oil to the tank to be able to accurately confirm th
at sufficient total quantity of oil is present.
The later dipsticks provide for a greater quantity of oil than the early ve
rsions, probably in response to this in-use 'drainage' issue and to reduce
the danger of the oil circuit becoming unprimed.
Note also that the UL Power engines now need a greater quantity to prevent
oil starvation during aerobatics; similar sort of issue.
Duncna McF.
----Original Message----
From: alanb@dpy01.co.uk
Date: 16/06/2018 13:44
Subj: Re: Europa-List: Gurgling (burping)
>>I find there is a net drain of oil (from the catch tank) during any prolo
nged idle (e.g of a few minutes, and including glide decents) where followe
d by shutdown. Alarmingly so on occasions (to below the minimum dipstick ma
rk). <<
The max - min marks in the dipstick only have meaning after the gurgling pr
ocess in SI-27-1997 are you doing that first?
AlanG-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
after flight the check, when cold, only needs a few blades as all the oil h
as already been returned to the tank. Never had oil draining from the tank
back 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.
AlanG-OBJT
Sent from my iPad
On 16 Jun 2018, at 11:30, "ami-mcfadyean@talktalk.net" <ami-mcfadyean@talkt
alk.net> wrote:
Jonathan,How do you know that the oil is draining overnight? Do you check o
il level immediately after last engine shutdown?I ask because I find there
is a net drain of oil (from the catch tank) during any prolonged idle (e.g
of a few minutes, and including glide decents) where followed by shutdown.
Alarmingly so on occasions (to below the minimum dipstick 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 bef
ore shutdown.
Duncan McF.
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of jonathanmilbank <jdmilbank@yahoo.co.uk>
Sent: Wednesday, May 30, 2018 5:53:47 PM
Subject: Europa-List: Gurgling (burping)
>
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
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 th
e 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 slo
wly to push the oil back into the
tank, while these days it can often take 50 or more compressions. Why?
My supposition is that the oil escapes past the oil pump and the rate of es
cape 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 r
elief valve is sticking in some
way?
Your experience and knowledge of likely causes would be gratefully received
.
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