Today's Message Index:
----------------------
1. 01:53 PM - Rotax tacho (europa@pstewart.f2s.com)
2. 01:54 PM - oil leak (europa@pstewart.f2s.com)
3. 02:41 PM - Re: oil leak (Jim Brown)
4. 02:41 PM - Re: oil leak (Frans Veldman)
5. 03:10 PM - Re: Rotax tacho (Brian Davies)
6. 07:39 PM - Re: oil leak (Erich Trombley)
7. 09:24 PM - Re: oil leak (Robert C Harrison)
8. 09:39 PM - Re: Rotax tacho (Robert C Harrison)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Some time ago I posted a query about the nonsense readings of our Rotax tacho.
Have now got the TCU rpm output to compare. When idle (TCU about 1500rpm) rotax
tacho not too far off (about 1700). When engine running at 2500 according to the
TCU Rotax tach reads >4500! Any thoughts as to if this suggests a duff tach or
a duff signal from the coils?
Regards
Paul
G-GIDY
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
we have just run the engine up (914) for the third time. After about 5 min there
was oil dripping from the right hand airbox drain and the air filter is soaked
in oil. There is no apparent leak from anywhere else. The oil tank has never
been over filled. The engine does not appear to be burning oil. It appears that
it has been drawn up into the airbox from the turbo - but why the air filter
soaked in oil? The first couple of engine runs (couple of months ago) there was
no evidence of oil leaking anywhere. Any thoughts?
Regards
Paul
G-GIDY
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Paul
-
Usually when oil is in the airbox, the bearing-oil seal is bad on the intak
e side of the turbo
-
If the engine is burning white smoke look-at the bearing on-the exhaust
side of the turbo.
-
Jim Brown
--- On Mon, 5/18/09, europa@pstewart.f2s.com <europa@pstewart.f2s.com> wrot
e:
From: europa@pstewart.f2s.com <europa@pstewart.f2s.com>
Subject: Europa-List: oil leak
we have just run the engine up (914) for the third time. After about 5 min
there
was oil dripping from the right hand airbox drain and the air filter is soa
ked
in oil. There is no apparent leak from anywhere else. The oil tank has neve
r
been over filled. The engine does not appear to be burning oil. It appears
that
it has been drawn up into the airbox from the turbo - but why the air filte
r
soaked in oil? The first couple of engine runs (couple of months ago) there
was
no evidence of oil leaking anywhere. Any thoughts?
Regards
Paul
G-GIDY
le, List Admin.
=0A=0A=0A
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
europa@pstewart.f2s.com wrote:
> we have just run the engine up (914) for the third time. After about 5 min there
> was oil dripping from the right hand airbox drain and the air filter is soaked
> in oil. There is no apparent leak from anywhere else. The oil tank has never
> been over filled. The engine does not appear to be burning oil. It appears that
> it has been drawn up into the airbox from the turbo - but why the air filter
> soaked in oil? The first couple of engine runs (couple of months ago) there was
> no evidence of oil leaking anywhere. Any thoughts?
Looks like a turbo problem. Oil leaking via the bearing into the inlet.
The air stream takes small oil bubbles up into the airbox, but the
majority of the oil will probably dribble into the air filter.
Could there be a problem with the turbo oil return line? Should go to
the auxiliary oilpump, and from there to the oil tank. If you disconnect
it at the oil tank and run the engine, oil should be dripping out of
this line. If no oil shows up, then you have found the problem.
Wait a minute! You ran the engine a couple of months ago for the last time?
Maybe the oil flowed back, and sucked some air in the turbo oil return
pump. Once there is air in this pump, it won't pump oil anymore, and the
oil will need to find another way out. Most likely than it will overflow
into the inlet air channel.
You can also have air in the oil system if you (or someone else) turned
the propeller the wrong way. Never tested it myself, but I've heard that
just a quarter of a turn in the wrong direction can allow air to get
into the oil system.
Do the test with the oil return line, and if it doesn't produce oil, you
will have to prime the oil system. This works great by pressurizing the
oil tank and turning the propeller by hand until oil comes out of the
oil return line.
--
Frans Veldman
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Hi Paul,
I have had two tachos exhibit this fault ( on different aircraft) and in
both cases the fault was fixed by changing the tacho.
Regards
Brian Davies
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
europa@pstewart.f2s.com
Sent: 18 May 2009 21:46
Subject: Europa-List: Rotax tacho
Some time ago I posted a query about the nonsense readings of our Rotax
tacho.
Have now got the TCU rpm output to compare. When idle (TCU about 1500rpm)
rotax tacho not too far off (about 1700). When engine running at 2500
according to the TCU Rotax tach reads >4500! Any thoughts as to if this
suggests a duff tach or a duff signal from the coils?
Regards
Paul
G-GIDY
Checked by AVG - www.avg.com
06:28:00
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Paul,
I had a similar experience when I first commissioned the engine. Sounds like the
check valve on the turbo is/was stuck. The stuck check valve allows oil to
fill up the turbo on both the intake and exhaust sides. Upon start up the oil
on the intake side is blown into the air box where it then collects and drains
as you have observed. While you can remove the check valve and clean it, more
than likely it will re seat itself.
Good luck,
Erich Trombley
N28ET Classic Mono 914
we have just run the engine up (914) for the third time. After about 5 min there
was oil dripping from the right hand airbox drain and the air filter is soaked
in oil. There is no apparent leak from anywhere else. The oil tank has never
been over filled. The engine does not appear to be burning oil. It appears that
it has been drawn up into the airbox from the turbo - but why the air filter
soaked in oil? The first couple of engine runs (couple of months ago) there was
no evidence of oil leaking anywhere. Any thoughts?
Regards
Paul
____________________________________________________________
Fast Computer Training. Click here.
http://thirdpartyoffers.juno.com/TGL2131/fc/BLSrjnsC7v6Knu7eDjYzNVAlYb8GYEnlVsXxvffM7p2QMNEm4AXZJ1fJAFC/
Message 7
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Hi! Paul
Did you "burp" the oil tank by propping the engine prior to start up to
pull oil out of the sump?
Sounds like oil through the turbo seal which I understand is ceramic and
probably needs to get well up to temperature at least once to make it
good? However a leaking turbo seal could pass oil up to the airbox as
well as to the air filter.
The oil in the drain also sounds like some leak past a valve guide. I
just had that on start up after a long period standing.
I take it that the "Ps" and "Ts" were all good ?
Have you purged air locks from the oil system as per the Rotax
instructions?
Sounds like you need some qualified advice IMHO.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
europa@pstewart.f2s.com
Sent: 18 May 2009 21:42
Subject: Europa-List: oil leak
we have just run the engine up (914) for the third time. After about 5
min there
was oil dripping from the right hand airbox drain and the air filter is
soaked
in oil. There is no apparent leak from anywhere else. The oil tank has
never
been over filled. The engine does not appear to be burning oil. It
appears that
it has been drawn up into the airbox from the turbo - but why the air
filter
soaked in oil? The first couple of engine runs (couple of months ago)
there was
no evidence of oil leaking anywhere. Any thoughts?
Regards
Paul
G-GIDY
Message 8
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Hi! Paul
Don't ask me why or what but it sounds like you have the tacho connected
to the wrong place which doubles the speed recorded.
I have read other postings on this.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
europa@pstewart.f2s.com
Sent: 18 May 2009 21:46
Subject: Europa-List: Rotax tacho
Some time ago I posted a query about the nonsense readings of our Rotax
tacho.
Have now got the TCU rpm output to compare. When idle (TCU about
1500rpm) rotax
tacho not too far off (about 1700). When engine running at 2500
according to the
TCU Rotax tach reads >4500! Any thoughts as to if this suggests a duff
tach or
a duff signal from the coils?
Regards
Paul
G-GIDY
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|