Oil pressure (sensor) failure

[Irmin]

Of course it was scary to watch the oil pressure while you’re en route and see it slowly falling down to almost nothing. Yes I declared an emergency but only two minutes later I fortunately compared the old oil pressure gauge with the new one built in the Garmin, GI275, which showed absolutely no problem and temperature also normal. At home I had a look at the sensors and came to the conclusion that the wiring was built in with not enough slack and therefor had to fail sooner or later. Please have a look at the photos attached. Can I replace only the rear part of that pressure sensor? Also the fuel pressure sensor seems in a similar bad wiring situation. I can see already a little bit of blank wire. If it’s possible I would like to replace only two rear parts of the sensor. Please advise if this is possible as it seems to be detachable.

Best regards, Irmin

 

 

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[MichMooney201]

Irmin

 

I had the exact same thing happen to me save I was not using Garmin equipment but I lost my oil pressure on my Electronics International setup; and I had removed all of my legacy gauges so I did NOT have a back up comparison and did the same as you, emergency and to the ground I went...rapidly.  I did not have a wiring slack issue but my oil pressure sensor just decided to quit after only about 4 months installed.  I called EI and a new oil pressure sender was on its way and installed at the FBO I happened to land at in Eau Claire, WI...problem fixed.  So yes, just the oil pressure sender is replaceable; at least for the EI sender but your setup appears identical to mine.  This is of course if it is indeed the sender and not the wire harness clip end that has malfunctioned.  The way those clip ends are manufactured are pretty robust and you would have to loose all electrical contact in order for a 0 psi reading to register from a bad clip, but weird things happen daily.  Installing a new sender and a run test would give you your answer pretty quickly without messing with an ohm meter and trying to figure out how the sender is sending signals.  Garmin tech might be helpful what the sender is supposed to put out for signal but I am not certain as I worked with EI on mine..

[N201MKTurbo]

If you really lose oil pressure, your prop will go out of control and your RPM will increase. usually the prop will start to surge. It happened to me once a long time ago. There is nothing subtle about it. If your engine continues to run well, it is probably all right. But you should still land ASAP and figure it out.

[Guest]

Irmin,

You could always do something like this to mount your transducers.

[Irmin]

It seems the backs of the transducers are covered with a protective plastic. Soo it’s confirmed that they are detachable. Are the backs where the wires are coming out screwed in or is it some kind of a bayonet mount?


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[Guest]

6 hours ago, Irmin said:

It seems the backs of the transducers are covered with a protective plastic. Soo it’s confirmed that they are detachable. Are the backs where the wires are coming out screwed in or is it some kind of a bayonet mount?


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The wires in the stainless steel transducers are glued in place during manufacture, the brass versions have a removable plug.