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RotaxEngines-List Digest: 8 Msgs - 07/10/13

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n100rh(at)sbcglobal.net
Guest

Posted: Sun Jul 21, 2013 12:03 pm Post subject: RotaxEngines-List Digest: 8 Msgs - 07/10/13

A quick question for you all. I have a 912S in a Rans S7. Out of the 

blue the oil pressure gauge is rapidly swinging from high to low 

followed by a pause at the correct oil pressure. Then more of the same. 

This only happens after flying for 20 min or so in 70F weather. I 

figured it must be the sender unit which is attached to the block near 

the oil pump. I got the same readings on the next flight. Reducing the 

engine to idle causes the gauge to settle down.

However, here's where it gets interesting, I noticed that all the 

gauges, tach, oil temp, oil pressure and voltage are stable at the 

beginning of the flight but when the oil pressure starts to swing wildly 

the other gauges too have started to vibrate, not to the extent of the 

oil pressure.

I'm starting to become suspicious that the voltage regulator is getting 

ready to crap out. Thoughts?



Ralph

Reno, NV

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Jul 21, 2013 7:00 pm Post subject: RotaxEngines-List Digest: 8 Msgs - 07/10/13

Check engine to airframe grounds and instrument grounds first.



Rick Girard

do not archive



On Sun, Jul 21, 2013 at 3:02 PM, Ralph K. Hallett III <n100rh(at)sbcglobal.net (n100rh(at)sbcglobal.net)> wrote:

  	  Quote: 	
		  --> RotaxEngines-List message posted by: "Ralph K. Hallett III" <n100rh(at)sbcglobal.net (n100rh(at)sbcglobal.net)>

  

 A quick question for you all. I have a 912S in a Rans S7. Out of the blue the oil pressure gauge is rapidly swinging from high to low followed by a pause at the correct oil pressure. Then more of the same. This only happens after flying for 20 min or so in 70F weather. I figured it must be the sender unit which is attached to the block near the oil pump. I got the same readings on the next flight. Reducing the engine to idle causes the gauge to settle down.

  However, here's where it gets interesting, I noticed that all the gauges, tach, oil temp, oil pressure and voltage are stable at the beginning of the flight but when the oil pressure starts to swing wildly the other gauges too have started to vibrate, not to the extent of the oil pressure.

  I'm starting to become suspicious that the voltage regulator is getting ready to crap out. Thoughts?

 

 Ralph

 Reno, NV

 

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Jul 22, 2013 5:25 am Post subject: Re: RotaxEngines-List Digest: 8 Msgs - 07/10/13

Hi Ralph,



I'm with Rick. Sounds like a poor ground. It could be a loose ground or a corroded one.

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