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oil pressure adjustment

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greghale

Joined: 10 Jan 2007
Posts: 91
Location: Tulsa, Oklahoma

Posted: Sat Feb 12, 2011 8:29 pm Post subject: oil pressure adjustment

Hey Guys,

My oil pressure has been running a tad bit high.  I wanted to adjust the pressure down.  Does anyone know which way (CW CCW) the adjustment screw should be turned to lower the pressure?   I could guess, but if I'm wrong, I have to pull the cowling off again.   Don't want to chip the new paint.



Thanks,

Greg...

_________________
Greg Hale rv10 -- N210KH
www.nwacaptain.com

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sat Feb 12, 2011 8:53 pm Post subject: oil pressure adjustment

I would recommend leaving it alone. Slightly high won't hurt anything.  

It likely will come down as soon as warm weather returns.

On 2/12/2011 9:29 PM, greghale wrote:

 	  Quote: 	
		   



 Hey Guys,

 My oil pressure has been running a tad bit high.  I wanted to adjust the pressure down.  Does anyone know which way (CW CCW) the adjustment screw should be turned to lower the pressure?   I could guess, but if I'm wrong, I have to pull the cowling off again.   Don't want to chip the new paint.



 Thanks,

 Greg...



 --------

 Greg Hale rv10 -- N210KH

 www.nwacaptain.com





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=330849#330849

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

greghale

Joined: 10 Jan 2007
Posts: 91
Location: Tulsa, Oklahoma

Posted: Sun Feb 13, 2011 7:30 am Post subject: Re: oil pressure adjustment

My oil pressure has been running around 95psi since new.  This is during the first start of the day.  After the engine has run for awhile, it will go down to 85 psi which is OK for me.  I just want to lower it some.  The AFS engine monitor becomes a nuisance until the pressure drops below 95 which is where I have the top limit set.



Greg...

_________________
Greg Hale rv10 -- N210KH
www.nwacaptain.com

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sun Feb 13, 2011 7:45 am Post subject: oil pressure adjustment

New 172s if I recall correctly have their redline for IO-360 set at 100 

psi, and the pickoff is in a location that would give closer to 115 psi 

in the old pickoff location. I'd say it would be a lot easier to just 

reset your AFS limit to 100. Many planes will go over red line on first 

takeoff of the day in cool/cold weather. Nothing to be concerned about 

unless you start losing oil outside the engine. IMHO this falls under 

don't fix what isn't broke.

Kelly

A&P/IA

On 2/13/2011 8:30 AM, greghale wrote:

 	  Quote: 	
		   



 My oil pressure has been running around 95psi since new.  This is during the first start of the day.  After the engine has run for awhile, it will go down to 85 psi which is OK for me.  I just want to lower it some.  The AFS engine monitor becomes a nuisance until the pressure drops below 95 which is where I have the top limit set.



 Greg...



 --------

 Greg Hale rv10 -- N210KH

 www.nwacaptain.com





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=330876#330876

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Sun Feb 13, 2011 7:56 am Post subject: oil pressure adjustment

Hey Greg,



We had the same issue.  As I remember, it is not a screw adjustment.  The 

way we adjusted the oil pressure on the IO 540 was to cut the safety wire 

and unscrew the cap on the oil pressure gizmo on the copilot side of the 

engine -- that reveals a steel ball and a pressure spring.  On the opposite 

end of the spring from the ball are a couple of washers used as spacers to 

increase/decrease the tension on the spring -- which regulates the oil 

pressure.  We took one washer out, and all is well.  At first, it doesn't 

look like there are spacers down in there, but they are.



Sorry about the lack of technical jargon -- I can take a picture of it later 

this PM if needed.



Later, - Lew

---

_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sun Feb 13, 2011 8:14 am Post subject: oil pressure adjustment

I'd agree fully.  I was seeing mid-to-high 90's

when cold, and then when summer comes, on roll-out from

landing I'd get an alarm because my alarm was set to

40...which I then set to 35.  You're better off just

setting the alarm limit up because you're not way out

of spec or anything and this is still winter.

You just really don't have a problem.

Tim Olson - RV-10 N104CD

do not archive

On 2/13/2011 9:42 AM, Kelly McMullen wrote:

 	  Quote: 	

 New 172s if I recall correctly have their redline for IO-360 set at 100

 psi, and the pickoff is in a location that would give closer to 115 psi

 in the old pickoff location. I'd say it would be a lot easier to just

 reset your AFS limit to 100. Many planes will go over red line on first

 takeoff of the day in cool/cold weather. Nothing to be concerned about

 unless you start losing oil outside the engine. IMHO this falls under

 don't fix what isn't broke.

 Kelly

 A&P/IA

 On 2/13/2011 8:30 AM, greghale wrote:

> 

>

> My oil pressure has been running around 95psi since new. This is

> during the first start of the day. After the engine has run for

> awhile, it will go down to 85 psi which is OK for me. I just want to

> lower it some. The AFS engine monitor becomes a nuisance until the

> pressure drops below 95 which is where I have the top limit set.

>

> Greg...

>

> --------

> Greg Hale rv10 -- N210KH

> www.nwacaptain.com

>

>

> Read this topic online here:

>

> http://forums.matronics.com/viewtopic.php?p=330876#330876

>

>

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Sun Feb 13, 2011 8:58 am Post subject: Re: oil pressure adjustment

One more thought on high oil pressure.  I heard of an oil cooler being blown out due to too high oil pressure on another plane.  I don't know how high that would have to be, to be of concern, but I never would have thought of that at all.



Later, - Lew

_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sun Feb 13, 2011 9:54 am Post subject: oil pressure adjustment

Probably when it's cold out:

http://www.reiffpreheat.com/Oil%20cooler%20heater.htm



An oil cooler should be able to handle normal situations fine...and

if you were talking high pressure because of no preheat, then

you're talking an extreme situation that wouldn't be fixed by

changing the setting a little lower.



I did run into one RV-10 pilot at one time who didn't calibrate

his oil pressure on the EIS, and never set the proper scale

factor and offset to make it read properly.   It read high,

so he just adjusted the engine.  Scary....once you set the

proper scale factor and offset, you'd probably find he

reduced it way too low.



So FIRST, verify the reading is all calibrated and set

right, then decide what to do.  But, you're not going to

save an oil cooler from blowout due to routine normal

oil pressure extremes, unless it's a bad cooler.



Tim Olson - RV-10 N104CD

do not archive

On 2/13/2011 10:58 AM, Lew Gallagher wrote:

 	  Quote: 	
		   



 One more thought on high oil pressure.  I heard of an oil cooler being blown out due to too high oil pressure on another plane.  I don't know how high that would have to be, to be of concern, but I never would have thought of that at all.



 Later, - Lew



 --------

 non-pilot

 crazy about building

 NOW OFICIALLY BUILDER #40549

 Fly off completed !





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=330896#330896

flysrv10(at)gmail.com
Guest

Posted: Sun Feb 13, 2011 10:09 am Post subject: oil pressure adjustment

But if you really want to; counter clockwise will reduce the pressure. 

Do not archive

Sent from my iPad

On Feb 13, 2011, at 8:42 AM, Kelly McMullen <kellym(at)aviating.com> wrote:

 	  Quote: 	

 New 172s if I recall correctly have their redline for IO-360 set at 100 psi, and the pickoff is in a location that would give closer to 115 psi in the old pickoff location. I'd say it would be a lot easier to just reset your AFS limit to 100. Many planes will go over red line on first takeoff of the day in cool/cold weather. Nothing to be concerned about unless you start losing oil outside the engine. IMHO this falls under don't fix what isn't broke.

 Kelly

 A&P/IA

 On 2/13/2011 8:30 AM, greghale wrote:

> 

> 

> My oil pressure has been running around 95psi since new.  This is during the first start of the day.  After the engine has run for awhile, it will go down to 85 psi which is OK for me.  I just want to lower it some.  The AFS engine monitor becomes a nuisance until the pressure drops below 95 which is where I have the top limit set.

> 

> Greg...

> 

> --------

> Greg Hale rv10 -- N210KH

> www.nwacaptain.com

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=330876#330876

> 

> 

> 

> 

> 

> 

> 

> 

> 

>

flysrv10(at)gmail.com
Guest

Posted: Sun Feb 13, 2011 3:11 pm Post subject: oil pressure adjustment

On some engines, it is a screw. Mine was. 



Do not archive. 

Sent from my iPad



On Feb 13, 2011, at 8:50 AM, "Lew Gallagher" <lewgall(at)charter.net> wrote:



[quote] 

 

 Hey Greg,

 

 We had the same issue.  As I remember, it is not a screw adjustment.  The way we adjusted the oil pressure on the IO 540 was to cut the safety wire and unscrew the cap on the oil pressure gizmo on the copilot side of the engine -- that reveals a steel ball and a pressure spring.  On the opposite end of the spring from the ball are a couple of washers used as spacers to increase/decrease the tension on the spring -- which regulates the oil pressure.  We took one washer out, and all is well.  At first, it doesn't look like there are spacers down in there, but they are.

 

 Sorry about the lack of technical jargon -- I can take a picture of it later this PM if needed.

 

 Later, - Lew

 

 

 ---

greghale

Joined: 10 Jan 2007
Posts: 91
Location: Tulsa, Oklahoma

Posted: Sun Feb 13, 2011 4:35 pm Post subject: Re: oil pressure adjustment

Thanks everyone for the replies.  I did find what I wanted on google.  I adjusted the pressure by turning the adjustment screw out CCW 1 turn.  Pressure now on takeoff 85 instead of the 95 I saw earlier.  Alls well and the airplane is flying great.  The 14 inches of Oklahoma snow finally melted and the temperature outside was 60 degrees.

_________________
Greg Hale rv10 -- N210KH
www.nwacaptain.com

EFDsteve(at)aol.com
Guest

Posted: Sun Feb 13, 2011 5:59 pm Post subject: oil pressure adjustment

Please excuse my question, because my plane isn't flying yet so I just  don't have this experience, but my engine has a vernatherm, which is a required  replacement at overhaul and is supposed to vary the oil flow into the oil  cooler, based on the temperature of the oil.  When I hear about an oil  cooler being "blown" because of high oil pressure, when the oil is cold, how can  that happen if there is a temperature compensated valve in the engine limiting  the flow to the oil cooler?

  

 Thanks.

  

 Steve Weinstock

 40230, finishing kit

  

  In a message dated 2/13/2011 11:54:55 A.M. Central Standard Time,  Tim(at)MyRV10.com writes:

  	  Quote: 	
		  -->    RV10-List message posted by: Tim Olson <Tim(at)myrv10.com>



Probably    when it's cold    out:

http://www.reiffpreheat.com/Oil%20cooler%20heater.htm



An oil    cooler should be able to handle normal situations fine...and

if you were    talking high pressure because of no preheat, then

you're talking an extreme    situation that wouldn't be fixed by

changing the setting a little    lower.



I did run into one RV-10 pilot at one time who didn't    calibrate

his oil pressure on the EIS, and never set the proper    scale

factor and offset to make it read properly.   It read    high,

so he just adjusted the engine.  Scary....once you set    the

proper scale factor and offset, you'd probably find he

reduced it    way too low.



So FIRST, verify the reading is all calibrated and    set

right, then decide what to do.  But, you're not going to

save    an oil cooler from blowout due to routine normal

oil pressure extremes,    unless it's a bad cooler.



Tim Olson - RV-10 N104CD

do not    archive

On 2/13/2011 10:58 AM, Lew Gallagher wrote:

 	  Quote: 	
		      -->  RV10-List message posted by: "Lew    Gallagher"<lewgall(at)charter.net>



 One more thought on high    oil pressure.  I heard of an oil cooler being blown out due to too high    oil pressure on another plane.  I don't know how high that would have to    be, to be of concern, but I never would have thought of that at    all.



 Later, - Lew



 --------

    non-pilot

 crazy about building

 NOW OFICIALLY BUILDER    #40549

 Fly off completed !





    Read this topic online here:



    http://forums.matronics.com/viewtopic.php?p=330896#330896






	


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 [quote][b]

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sun Feb 13, 2011 6:07 pm Post subject: Re: oil pressure adjustment

Answer to the last question is, I think, that the vernatherm never closes completely, so the oil cooler sees full pressure even with low flow rates thru it.

_________________
Bob Turner
RV-10 QB

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Sun Feb 13, 2011 6:42 pm Post subject: oil pressure adjustment

The vernatherm is wide open when cold, allowing oil to  bypass the

cooler. It needs to fully close shutting off the bypass when the oil

reaches 180 degrees, forcing the oil through the cooler. IOW your

thinking about how it operates is backwards.



On Sun, Feb 13, 2011 at 7:07 PM, Bob Turner <bobturner(at)alum.rpi.edu> wrote:

 	  Quote: 	
		   



 Answer to the last question is, I think, that the vernatherm never closes completely, so the oil cooler sees full pressure even with low flow rates thru it.



 --------

 Bob Turner

 RV-10 QB





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=330967#330967

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sun Feb 13, 2011 6:49 pm Post subject: oil pressure adjustment

Of course you really need to know from a calibrated pressure gauge that 

the pressure is actually high. Without calibration, 5-10 lbs one way or 

the other is meaningless. I'm with Tim. I'd bet that come summer you 

will be adjusting it back to where it was.

On 2/13/2011 11:08 AM, Rob Kermanj wrote:

 	  Quote: 	
		   



 But if you really want to; counter clockwise will reduce the pressure.



 Do not archive

 Sent from my iPad

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Mon Feb 14, 2011 10:24 am Post subject: Re: oil pressure adjustment

Thanks for the info, Kelly. I tend to think backwards anyway!

_________________
Bob Turner
RV-10 QB

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