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Port for additional oil pressure gauge for testing

in 912 / 914 Technical Questions 12 years ago
The 912S in our Falke motor glider has a quite low oil pressure (2 bar, at the bottom of the green arc). Therfore I want to attach a mechanical gauge only for testing purposes and double check. In one article I onderstooood there is an aditional port for testing purposes. Can anyone explain where iI exactly can find this additional port. (Maybe a picture or a drawing)
Many thanks in advance,

Regards,
Hardy

  • Re: Port for additional oil pressure gauge for testing

    by » 12 years ago

    Hi Hardy,

    There is another port. It is right in front of the other oil pressure port. This port may be open to you or it may be in use depending on your engine setup. You can also take out the primary oil sender and tee in a mechanical gauge. You can look in the illustrated parts manual and see these parts.. It all works. You have the right idea to do a comparison test. My bet is you have one of three problems, who knows if mo are acting up. It can easily be a poor ground wire and or a had pressure sender and both of these are very common. The other item may be the older style oil plug screw, spring and ballbearing. You have the right idea to mechanically compare and check the real oil pressure.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Gerhard Beckers
      
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  • Re: Port for additional oil pressure gauge for testing

    by » 11 years ago

    Roger, we're new to the 912S, and currently designing our EFIS/EMS fit (MGL XTreme)for our a/c (Eurofox).

    We'd like a backup for both the RPM and Oil Pressure indications on the engine, in case of failure of the EMS (or a/c electrical failure).

    Would the extra port you mention be suitable for the additional Oil Pressure measurement, with suitable indication (oil pressure gauge and/or visual/audio warning) on the panel?
      
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  • Re: Port for additional oil pressure gauge for testing

    by » 11 years ago

    Hi Richard,

    It would work, but personally I don't see any reason to have back-up rpm and oil pressure. If you were flying and the rpm went dark what would change in your flying? Would it be a real issue or are you really paying more attention to air speed. The engine isn't going to care what rpm your at until you find an airport unless of course your WOT and over the limits, but that shouldn't happen. It would be rare indeed that rpm goes dark during a flight. The same goes for the oil pressure. If your flying along and the oil pressure goes dark or acts up what would change in flight? You'll look at the other gauges and see if there are any other changes and you'll fly to the nearest airport and land to check it out. I see odd oil pressure readings quite often in peoples planes. It is rare that it is a real oil pressure problem and most of the time it's the sender. Could you have a real oil pressure problem, sure like a friend of mine that allowed an oil hose to contact the hot exhaust and burn a hole through, but having two gauges wouldn't have helped any. That cost him a new engine. I guess my point is the engine and gauges most likely won't go bad at the same moment. If something happens to the gauge alone the engine is fine. If the gauge is fine and the engine has an issue the the gauge is there to help you.


    Just a thought and thinking out loud and of course if you really want them by all means put them in.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Port for additional oil pressure gauge for testing

    by » 11 years ago

    Many thanks for your detailed reply, Roger - much appreciated.

    I was really considering loss of the EFIS/EMS; unlikely with MGL kit, I understand, but possible. Losing the EFIS wouldn't be a problem - we just revert to pressure flight instruments (in the UK, for our category of a/c, it's mandatory to backup up glass with pressure ALT/AIS/Compass - probably the same in the US?).

    But loss of EMS could get more interesting on a longer trip, or with limited alternates. Loss of oil pressure, if genuine, is serious, and means getting the a/c down as soon as practical. Carrying on a flight (there are always additional reasons)without EMS, for an hour or so would be risky.

    I take your point, that it would be unlikely to have an additional problem, but we'd feel happier with a warning.

    It's just been suggested that we could change the standard VDO OP sensor to one with additional 'With Warning Contact ' functionality, which could be wired to illuminate a separate Low Oil Pressure warning light. That seems reasonable?
      
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