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unsteady oil pressure

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ronlee

Joined: 25 Dec 2006
Posts: 141

Posted: Tue Jan 25, 2011 11:20 am Post subject: unsteady oil pressure

The last two flights my oil pressure after hot has begun to jump around. At the top end it is the same as it has always been, at 58 PSI hot. It stays there most of the time but occasionally it will bounce from 49-55-58 and then sit on 58 for a while. I know the senders have a tendency to go bad. Any suggestions of a more durable, cheaper one to use? Any suggestions of any other mechanical problems that would cause the problem.

_________________
Ron Lee
Tucson, Arizona

Roger Lee

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

Posted: Tue Jan 25, 2011 11:42 am Post subject: Re: unsteady oil pressure

Hi Ron,



Haven't heard from you in a while. Hope everything is good.



I would recommend the new parts for the oil pressure regulation. This could be a gauge issue, but the swings are still close enough not to be.

Here are the part numbers for the new Rotax parts. It takes 5 minutes to install. This has stabilized many an oil pressure as that is what it was originally designed for and it may raise your pressure 5 psi or so. I have installed these in at least 20 aircraft. These parts cost about $75



Rotax parts: cap screw 841-983,

Spring 838-122, and oil pressure regulator cone 857-230

Stop on by Ryan some time. We all fly at least twice a week and head out for our breakfast runs all over AZ.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

pchristensen10(at)austin.
Guest

Posted: Tue Jan 25, 2011 11:56 am Post subject: unsteady oil pressure

I had a similar problem and it turned out to be bad ground connection.



Pete

Kitfox III, 912

Leander, TX



On 1/25/2011 1:20 PM, ronlee wrote:

 	  Quote: 	
		   



 The last two flights my oil pressure after hot has begun to jump around. At the top end it is the same as it has always been, at 58 PSI hot. It stays there most of the time but occasionally it will bounce from 49-55-58 and then sit on 58 for a while. I know the senders have a tendency to go bad. Any suggestions of a more durable, cheaper one to use? Any suggestions of any other mechanical problems that would cause the problem.



 --------

 Ron Lee

 Tucson, Arizona





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=328461#328461

Duncan McFadyean

Joined: 18 Jan 2011
Posts: 220

Posted: Tue Jan 25, 2011 2:39 pm Post subject: unsteady oil pressure

I have 400 hours on one of these:

http://www.aircraftspruce.com/catalog/inpages/microflight1000.php

although the sensor is 'remotely' mounted.

Anyone want to buy an unused Rotax sender?!



Duncan McF



--

Roger Lee

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

Posted: Tue Jan 25, 2011 4:42 pm Post subject: Re: unsteady oil pressure

Grounds certainly do cause gauge swings, but usually they are a little wider apart than Ron's. Ron you can try to tighten all the grounds, but I don't think that will cure this, but who knows. Grounds are considered loose until you put a wrench on them. Remember finger tight, wrench loose. I would still put the other Rotax parts in no matter what you find.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Wed Jan 26, 2011 6:15 am Post subject: unsteady oil pressure

> I would recommend the new parts for the oil pressure regulation. This  could be

      a gauge issue, but the swings are  still close enough not to be.

      Here are the  part numbers for the new Rotax parts. It takes 5 minutes to  install.

      This has stabilized many an oil  pressure as that is what it was originally

       designed for and it may raise your pressure 5 psi or so. I have installed  these

      in at least 20 aircraft. These parts  cost about $75 <

  

  These parts caused my oil pressure to fluctuate all over the  place from what was previously a pretty steady indication so I went  back to the old original ball /spring which works fine. I guess the old  adage of "if it ain't broke ,don't fix it " applies in my case But  then I also have a weird 912 Ul of the early 90's vintage . It  does lots of things different from anyone else's 912

                                           Dick Maddux

                                           Milton,Fl



 [quote][b]

Roger Lee

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

Posted: Wed Jan 26, 2011 7:54 pm Post subject: Re: unsteady oil pressure

I put these parts in a 2006 Rotax 912ULS today and the plane has a nice steady 55 psi oil pressure, not to mention another 500 hrs onto the TBO.

Rotax parts: cap screw 841-983, 

Spring 838-122, and oil pressure regulator cone 857-230

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

wtcef(at)arn.net
Guest

Posted: Thu Jan 27, 2011 8:17 am Post subject: unsteady oil pressure

Roger,

I think this question has been asked before but I couldn't put my finger on

it.  We have a 914ul in a Europa XS.  Is this a desirable upgrade for

it...and does it extend the TBO on a 914?



Hal Carpenter, Amarillo, TX



--

Roger Lee

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

Posted: Thu Jan 27, 2011 2:34 pm Post subject: Re: unsteady oil pressure

If you are already at 1200 hrs. you don't get any more time. If you are 1000 hrs. you may get 200 hrs more if you qualify. Here is the SB for the 912 and 914. This is Revision 2.





http://legacy.rotax-owner.com/si_tb_info/serviceb/sb-912-041-ul.pdf

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

Rich L

Joined: 23 Feb 2008
Posts: 63
Location: North Idaho

Posted: Tue Feb 01, 2011 2:53 am Post subject: Re: unsteady oil pressure

My oil pressure was 38-42 at 5200 RPM.  Actually, it was less at higher rpm's.  I just installed the parts Roger recommended and was pleased with the result. A pretty solid 55psi overall. It was 13degF when I tried it today and I was startled when the startup pressure was 83psi. This went down below 65 by the time it got to 120deg.  Caused me to recheck the op manual.  Thanks Roger.

_________________
Rich Little
N812RL S-7 912ULS
North Idaho
Kiev Prop

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