RE: Europa-List: Gurgling (burping)

[ami-mcfadyean@talktalk.net <amimcfadyean@talktalk.net>]

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) 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 before shutdown. 
Duncan McF.


From: owner-europa-list-server@matronics.com 
<owner-europa-list-server@matronics.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 after
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 compressions
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 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 supposition 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?


Your experience and knowledge of likely causes would be gratefully received.


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