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  #1  
Old 06-05-2017, 08:28 AM
KRAUSEGB KRAUSEGB is offline
 
Join Date: Oct 2008
Location: AGOURA, CALIFORNIA
Posts: 111
Default Zero oil pressure

After changing all of the hoses per the 5-year recommendation, I started the engine to check for any leaks and the alarm went off, showing zero oil pressure. I did not have any issues with the sending unit up to that time.
I have read previous blogs, going back for some years and not sure what the consensus is for the best sending unit replacement. I have logged 260 hours and have the Dynon 180 efis.
I intend to move the sending unit to the firewall as has been recommended by many.

Gary
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  #2  
Old 06-05-2017, 08:33 AM
jabarr jabarr is offline
 
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Location: Fayetteville, Georgia
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Did you purge the oil system after changing the hoses? Good chance there's nothing wrong with the sender if the system was not purged per the manual.
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  #3  
Old 06-05-2017, 09:40 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Part of a properly completed purge procedure is to turn the engine over by hand until an oil pressure reading is attained so you shouldn't be starting the engine after this type of maint. and being surprised by there being no oil pressure.

With the D-180, the oil pressure sensor is fed its reference voltage from the aircraft electrical system so if you somehow started the engine but then had the master switch turned off with the screen operating on its backup battery, the oil pressure would read zero
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  #4  
Old 06-05-2017, 10:26 AM
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Infidel Infidel is offline
 
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On the 912 series engine, I'd always pull the cap off the oil bottle and rotate the prop by hand until hearing the oil burping in the oil tank.
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  #5  
Old 06-05-2017, 01:48 PM
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MartySantic MartySantic is offline
 
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Quote:
Originally Posted by rvbuilder2002 View Post
With the D-180, the oil pressure sensor is fed its reference voltage from the aircraft electrical system so if you somehow started the engine but then had the master switch turned off with the screen operating on its backup battery, the oil pressure would read zero
Or had the D-180 operating on the backup battery (cause I bumped the button while getting in) with the avionics switch off. Don't ask how I know!
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Last edited by MartySantic : 06-05-2017 at 01:58 PM.
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  #6  
Old 05-10-2019, 04:10 PM
P51krause P51krause is offline
 
Join Date: Jan 2019
Location: Camarillo
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Per the POH it has you start the aircraft on the backup battery. Note the oil pressure within 10 sec, then turn on the avionics master switch. There is no oil pressure with the back up battery on the D180, but as soon as you turn the avionics master switch on presto, oil pressure. Any thoughts? First time poster, long time listener.
Michael
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  #7  
Old 05-10-2019, 04:29 PM
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sglynn sglynn is offline
 
Join Date: Mar 2008
Location: Anacortes, WA
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Default Oil pressure

If you drained oil out of the lines you probably just need to spin the motor until the system is full of oil again. Loosen one spark plug on each cylinder and with fuel off and mag disconnected spin motor with starter until you see oil pressure. Could take 30 seconds.
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  #8  
Old 05-10-2019, 05:23 PM
Wolfgang Wolfgang is offline
 
Join Date: Dec 2018
Location: salida, co
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I changed the oil and fuel lines and did the purge and found low oil pressure that would be high on taxi and lower in climb and cruise. (I say low, I mean somewhat lower than I was used to....was around 46 psi, and 'normal' was about 55 psi or so.)I was advised that some air in the oil lines might take a while to work out After about 20 hours of flight the oil pressure is back to normal and temps are fine. Sometimes it takes patience to let air escape.
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  #9  
Old 05-10-2019, 05:55 PM
DHeal DHeal is offline
 
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Location: Windsor, California
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Quote:
Originally Posted by sglynn View Post
If you drained oil out of the lines you probably just need to spin the motor until the system is full of oil again. Loosen one spark plug on each cylinder and with fuel off and mag disconnected spin motor with starter until you see oil pressure. Could take 30 seconds.
This is not the proper procedure for a ROTAX 912 ULS engine. If you have drained the oil lines then you need to perform a "purge" of the oil system in accordance with the procedures specified in the ROTAX maintenance manual. Just spinning the motor may not cause oil to flow and may result in engine damage.
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  #10  
Old 05-10-2019, 07:54 PM
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rolick22 rolick22 is offline
 
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Darn Lycoming guys!!
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