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Low Oil Pressure....High Oil Pressure

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pwmac(at)sisna.com
Guest

Posted: Tue Aug 26, 2008 5:55 pm Post subject: Low Oil Pressure....High Oil Pressure

Tommy,

Perform this test and tell us the result:

  Run a ground wire in place of what ever you now 

have directly from the sender to the gauge. Do 

not break the wire at the firewall - go around 

the firewall and thru the door.  Then fly the plane. Then we can go from there.

Tip: you might have to use an alligator clip at 

the sender to make sure you are really making a connection there.

Paul

==================



At 04:29 PM 8/26/2008, you wrote:

 	  Quote: 	
		  



Regarding my oil pressure issue.  I'm in the 

middle of the first annual here's what I've done to date:



With the Rotax Pressure Sender and a VDO gauge,

Oil Pressure at start up was 55 PSI

Cruise pressure was 30-35 PSI



1.  I replaced the pressure sender with one from another 912 I have.  No Joy.



2.  I swapped the VDO gauge.  Still No Joy.



3.  I replaced the wire from the sending unit to the VDO gauge.  Need I say?



4.  Today I removed the sending unit and 

temporarily hooked up a mechanical pressure 

gauge.  Upon start up the oil pressure went to 

67-68 PSI.  I let the engine run for a couple of 

minutes at 1800 RPM and then pushed the throttle 

in to about 3000 RPM.  The oil pressure stayed above 60 PSI.



So, I am thinking that either there is an 

incompatibility with my sending unit and gauge, 

or the problem lies elsewhere.  I suppose the 

mechanical gauge could be wrong, but really?  I 

doubt it.  It's sort of like changing parts till 

you get the answer you want, isn't it....  



So, have any of you switched to a mechanical 

gauge for your 912?  I would prefer an electric 

gauge because of the problems with running a 

tube into the cockpit.  I would think that a 

weak point would be the flared fitting at the connection to the block.



I am open to any suggestions.



I appreciate your thoughts.



Tommy Walker in Alabama

Do Archive



[quote="Tommy Walker"]Thanks folks, I got a 

mechanical gauge and all the plumbing.  I’m 

going to hook it up this week and compare pressure readings.



Thanks again,



Tommy Walker in Alabama

N8701

Do Not Archive



 > [b]

--------

Tommy Walker





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pwmac(at)sisna.com
Guest

Posted: Wed Aug 27, 2008 6:11 am Post subject: Low Oil Pressure....High Oil Pressure

Its true that a standard VOM cannot accurately measure small 

resistance. A specialized meter needs to be used that measures micro ohms.

Paul

==============

At 10:41 PM 8/26/2008, you wrote:

 	  Quote: 	
		  



Tommy,



try taking an alligator clip and wire and hooking up one to the 

ground on the gauge and hooking up to some other ground other than 

the one you are using now for the gauge. This will only take a few 

minutes. Let me know what happens. Oh, I forgot run the engine after 

this new ground is hooked up. I had the same issue a few months back 

and played with it for 2 hours. My meter said I had a good ground, 

but it ended up being a partial ground.



--------

Roger Lee

Tucson, Az.

Light Sport Repairman - Maintenance Rated

Rotax Service Center

520-574-1080





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