Europa-List Digest Archive

Mon 05/18/09


Total Messages Posted: 8



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


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    Time: 01:53:32 PM PST US
    From: europa@pstewart.f2s.com
    Subject: 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


    Message 2


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    Time: 01:54:26 PM PST US
    From: europa@pstewart.f2s.com
    Subject: 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 3


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    Time: 02:41:54 PM PST US
    From: Jim Brown <acrojim7534@YAHOO.COM>
    Subject: Re: oil leak
    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


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    Time: 02:41:55 PM PST US
    From: Frans Veldman <frans@paardnatuurlijk.nl>
    Subject: Re: oil leak
    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


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    Time: 03:10:24 PM PST US
    From: "Brian Davies" <bdavies@dircon.co.uk>
    Subject: Rotax tacho
    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


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    Time: 07:39:19 PM PST US
    From: "Erich Trombley" <erichdtrombley@juno.com>
    Subject: Re: oil leak
    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


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    Time: 09:24:40 PM PST US
    From: "Robert C Harrison" <ptag.dev@tiscali.co.uk>
    Subject: oil leak
    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


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    Time: 09:39:41 PM PST US
    From: "Robert C Harrison" <ptag.dev@tiscali.co.uk>
    Subject: Rotax tacho
    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




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