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Low Oil Pressure....High Oil Pressure

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Mon Jun 30, 2008 3:41 am Post subject: Low Oil Pressure....High Oil Pressure

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  

       [quote][b]

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Tommy Walker
N25A - Anniston, AL

Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Tue Aug 26, 2008 2:29 pm Post subject: Low Oil Pressure - Revisited

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.  Iâ€™m going to hook it up this week and compare pressure readings.  

   

Thanks again,  

   

Tommy Walker in Alabama  

N8701  

Do Not Archive  

        	  Quote: 	
		  [b]

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Tommy Walker
N25A - Anniston, AL

arno7452(at)bellsouth.net
Guest

Posted: Tue Aug 26, 2008 3:05 pm Post subject: Low Oil Pressure....High Oil Pressure

Tommy,

I had similar readings with my 912ULS.  Per Lockwood, oil pressure 

indicating higher when reducing rpm from 3500 to 2000 is normal.  Has to do 

with hydraulics.  i.e. oil flow in Rotax increases at lower rpm.  Therefore, 

pressure indication will indicate higher at lower rpm.



I ended up with Mitchell 80# sender and Mitchell 80# gauge.  My readings 

are:

50# at 3500 rpm

60# at 2000 rpm



Regards,

Ken

Flying CH701 N701LK

do not archive



---

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Roger Lee

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

Posted: Tue Aug 26, 2008 8:41 pm Post subject: Re: Low Oil Pressure....High Oil Pressure

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.



p.s.

I just saw what Paul posted. He has good advise. I don't think you have to fly it, but a good ground run up will tell you right off it it will make a difference.

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

walstroom

Joined: 24 May 2008
Posts: 3

Posted: Wed Aug 27, 2008 6:24 am Post subject: Low Oil Pressure....High Oil Pressure

We do maintenance on Rotax en we often have to change the VDO pres. sender. 

A few month's ago the 3rd NEW sender worked well !

Walstroom Netherlands



--------------------------------------------------

From: "Tommy Walker" <twalker(at)cableone.net>

Sent: Wednesday, August 27, 2008 12:29 AM

To: <rotaxengines-list(at)matronics.com>

Subject: Re: Low Oil Pressure....High Oil Pressure



 	  Quote: 	
		   

 <twalker(at)cableone.net>



 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.  Iâ?Tm going to hook it up this week and compare pressure 

 readings.



 Thanks again,



 Tommy Walker in Alabama

 N8701

 Do Not Archive



> [b]

 --------

 Tommy Walker





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 0765#200765

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ollie6a(at)embarqmail.com
Guest

Posted: Wed Aug 27, 2008 9:27 am Post subject: Low Oil Pressure....High Oil Pressure

A sender from GRT works fine and only costs $35 versus $258 from Lockwood/last catolog.

Ollie



On Wed, Aug 27, 2008 at 10:23 AM, Walstroom (Isbeschikbaar) <walstroom(at)isbeschikbaar.nl (walstroom(at)isbeschikbaar.nl)> wrote:

 [quote]--> RotaxEngines-List message posted by: "Walstroom (Isbeschikbaar)" <walstroom(at)isbeschikbaar.nl (walstroom(at)isbeschikbaar.nl)>

  

 We do maintenance on Rotax en we often have to change the VDO pres. sender. A few month's ago the 3rd NEW sender worked well !

 Walstroom Netherlands

 

 --------------------------------------------------

 From: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>

 Sent: Wednesday, August 27, 2008 12:29 AM

 To: <rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)>

 Subject: Re: Low Oil Pressure....High Oil Pressure

 

  	  Quote: 	
		   --> RotaxEngines-List message posted by: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>

 

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

 

 Thanks again,

 

 Tommy Walker in Alabama

 N8701

 Do Not Archive

 

  	  Quote: 	
		   [b]

 	
 

 

 --------

 Tommy Walker

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=200765#200765

 

 

 

 

 

 

 

 

 

 

 

 

	


 

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[b]

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mjhamm01

Joined: 12 Jun 2008
Posts: 4

Posted: Wed Aug 27, 2008 11:47 am Post subject: Re: Low Oil Pressure - Revisited

Tommy,



You might check to make sure that the resistance range for oil pressure

for the pressure sender and VDO gauge are a perfect match.



I did encounter a slight difference with a fuel pressure application

(in a 914) using a JPI Gauge and a VDO sender. Adding a 5 to

10 ohm resister in series from either the sender to the ground wire or 

the sender to the Gauge would slightly boost pressure readings.  In the end, I elected to leave out the resisters and just go with a slightly lower reading.



Additionally, it may be possible that some of your difference in high/low oil pressure readings may be due to a slightly lower system voltage at or after startup in comparison with higher RPM's and more output from the

altenator.  Perhaps someone could comment on that possibility.



.... Marv Hamm



==========

 	  Tommy Walker wrote: 	
		  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

        	  Quote: 	
		  [b]

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Sun Aug 31, 2008 5:19 pm Post subject: Verification of Friction Torque 912 ULS

I am trying to perform the 100 Hr Inspection items from the Line Maintenance Manual.  I was doing pretty well until I got to this section:  2.2.5) Check of propeller gear box

   a) Verification of the friction torque.  i seem to have hit a dead end in finding the reference for this procedure.  



Would someone be kind enough to point me to this procedure?  I have the Line Maintenance Manual open, but can find the reference  (See Chapter 12-00-00, para 7.1)   



Many thanks,



Tommy Walker in Alabama

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_________________
Tommy Walker
N25A - Anniston, AL

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