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High Oil Pressure

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Rich L

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

Posted: Tue Jun 24, 2008 7:58 pm Post subject: High Oil Pressure

I seem to have a new problem after the last oil change.  At startup, warm-up and takeoff it is a steady 69-72.  After about 15 Min's in the air it starts fluctuating from 79-92.  It was even higher (99), with the Rotax oil filter.  I changed to an after-market and it came down about 10 lbs.  I checked the Oil Sender connections.  The engine is running great otherwise so I'm not sure whats wrong.  Any Ideas?  Thanks



Rich

daberti(at)sbcglobal.net
Guest

Posted: Wed Jun 25, 2008 3:17 pm Post subject: High Oil Pressure

I ran into the same thing and eliminated the problem by not filling the oil

tank to the high level mark.  Changing the filter may have dropped the oil

level just enough to accomplish the same thing but like you I changed

senders and filters and got the same results.  My pressure would indicate

little spikes on the needle and eventually just peg the thing.  I have to

admit it was a little unnerving the first time I glanced at my gage and saw

the needle pegged.  I thought sure I spun a bearing but the oil temps stayed

steady.



Dave 912ULS



--

Rich L

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

Posted: Wed Jun 25, 2008 6:52 pm Post subject: Re: High Oil Pressure

Thanks for the reinforcement Dave.  I was going to order a pressure sender tomorrow but will hold off for now.  I don't like changes that occur without reason.  I use the EIS so all my readouts are digital and it really jumps around after 15 minutes or so.  Otherwise it is rock solid and runs cool and smooth.  I can't help but think its instrumentation. (I hope so).  If I find out anything else, Ill post it.  thanks again

Rich

Ollie Washburn

Joined: 10 Jan 2006
Posts: 56
Location: Central Florida

Posted: Thu Jun 26, 2008 4:48 am Post subject: High Oil Pressure

I also have EIS and my oil press reads 99 at idle, but in cruise oil

press reads normal although it jumps around a bit. When i pull the

power back for landing the press goes to 99 again. I temporialy

installed a oil press gage and it read normal at all rpms so I suspect

it is the Rotax press sender, which is expensive. Some have suggested

it should be mounted on the firewall.

Ollie     Central FL.



On 6/25/08, Rich L <kitfox812(at)gmail.com> wrote:

 	  Quote: 	
		   



 Thanks for the reinforcement Dave.  I was going to order a pressure sender

 tomorrow but will hold off for now.  I don't like changes that occur without

 reason.  I use the EIS so all my readouts are digital and it really jumps

 around after 15 minutes or so.  Otherwise it is rock solid and runs cool and

 smooth.  I can't help but think its instrumentation. (I hope so).  If I find

 out anything else, Ill post it.  thanks again

 Rich





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=189866#189866

_________________
Ollie RV6-A & Rans S7S
Central FL

fygdog(at)yahoo.com
Guest

Posted: Thu Jun 26, 2008 5:56 am Post subject: High Oil Pressure

you should clean off all thread sealant on pressure sender and see what happens



--- On Wed, 6/25/08, Rich L <kitfox812(at)gmail.com> wrote:

 [quote]From: Rich L <kitfox812(at)gmail.com>

Subject: Re: High Oil Pressure

To: rotaxengines-list(at)matronics.com

Date: Wednesday, June 25, 2008, 8:52 PM



[quote]--> RotaxEngines-List message posted by: "Rich L" <kitfox812(at)gmail.com>  Thanks for the reinforcement Dave.  I was going to order a pressure sender tomorrow but will hold off for now.  I don't like changes that occur without reason.  I use the EIS so all my readouts are digital and it really jumps around after 15 minutes or so.  Otherwise it is rock solid and runs cool and smooth.  I can't help but think its instrumentation. (I hope so).  If I find out anything else, Ill post it.  thanks again Rich     Read this topic online here:  http://forums.matronics.com/viewtopic.php?p=189866#189866                  [quote][b]

Roger Lee

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

Posted: Sun Jun 29, 2008 5:53 pm Post subject: Re: High Oil Pressure

Hi Guys,



I would not think the oil pressure is really at 99psi. You need to check this against a mechanical gage which I think will show you your pressure is normal. My first thought is the oil pressure sensor wire is too close to an energy producing wire. Move your oil pressure sender wire away from all energy producing wires.

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

davidjoyce(at)doctors.org
Guest

Posted: Mon Jun 30, 2008 1:11 am Post subject: High Oil Pressure

Roger, Another alternative is that it has a poor connection. If a wire 

breaks or becomes disconnected the default reading is very high, as I 

discovered once just after take off in the middle of France. Reconnecting it 

sorted it. Regards, David Joyce, G-XSDJ

---

malannx(at)bigpond.com
Guest

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

Has happened to me(wildly varying oil pressure). Replaced the sender unit 

but no difference. Finally tracked it down to the wire fractured at the 

connector to the sender unit.



The tefzel outer was still intact and gave no indication to the broken wire.

Finally found it by moving the sender wire with the engine running. The wire 

was secured better re-crimped, and the original sender has now done 400 hrs.



Rotax mechanic here suggested planes with dynamically balanced props seem to 

suffer less of these types of problems.



Others experience maybe quite different.



Malcolm Ferguson

Esqual 912S

Roger Lee

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

Posted: Mon Jun 30, 2008 6:00 am Post subject: Re: High Oil Pressure

Hi All,



Wires and not the gages are typically notorious for false readings on gages. This is the first place I always look along with the mechanical gage. Ground's and power supply's should be the first thing checked. It is usually the easiest and cheapest. 



Note*

I will have to say sometimes finding a bad wire can be like looking for a ghost. The partial ground that I stated above took me 4 hours to find because the test meter said there was a ground. 

Now I have a few simple quick test. I will bypass the gage ground or power supply and use a jumper wire for a quick and dirty test. The mechanical gage setup is so cheap and easy to make everyone should have one in their tools and diagnostic equipment.



Let us know what you find Rich. The more experience we all post the easier it is for the next guy.

_________________
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: Thu Jul 10, 2008 7:56 am Post subject: Re: High Oil Pressure

I installed a new oil pressure sender today from GRT who makes the EIS.  Went flying with it and the pressure was 57 on start-up and about 62 for 15 mins. in the air.  Then it started climbing in spurts up to 90 so I came home.  Still looking..........

Rich L

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

Posted: Thu Jul 10, 2008 7:58 am Post subject: Re: High Oil Pressure

Oh Ya, I forgot to say that when I throttle back to land, the oil pressure drops back to normal (67-72).  While taxiing in, it was a steady 57.



???

Roger Lee

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

Posted: Thu Jul 10, 2008 3:55 pm Post subject: Re: High Oil Pressure

Try and hook up a new temporary ground wire and then try it. Just take a jumper wire and bypass the original ground wire. tell us what happens.

_________________
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: Fri Jul 11, 2008 7:56 pm Post subject: Re: High Oil Pressure

Nailed it.  Thank you  Roger and all who helped me in my search.  What it turned out to be was the Ground Wire from the Battery to the engine.  It read 10 ohms and when I wiggled it, went to 0 ohms.  I puddled solder into the crimp then took it up  for a test.  The Oil Pressure was rock solid from 57 to 62 during a 30 min flight.  The other good thing is during my search I found another possible problem in the suction Oil Line from the Oil Cooler to the engine.  It is the Blue Oil Line they sell and the Radius was 3 inches and had started to crimp under the firesleeve.  I replaced the line and widened out the radius with some brass fittings.  I think I will go to rigid oil lines.  Anyway, thanks to all and the Kitfox/Rotax is an awsome combination.



Rich

rampil

Joined: 04 May 2007
Posts: 870

Posted: Sat Jul 12, 2008 12:36 pm Post subject: Re: High Oil Pressure

Rich,



Best not to replace the flex oil line with metal.  Have you noticed the 

degree of vibration on start and stop?  You will tear up any metal lines

on the engine side of the firewall.  By the same token, always follow

good manufacturing practice and AC43.13 when it comes to bend 

radius and the other 5 or 6 rules of flex hose use.

_________________
Ira N224XS

Rich L

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

Posted: Sat Jul 12, 2008 1:26 pm Post subject: Re: High Oil Pressure

Good point and thanks Ira.   The oil line ends up very close to the exhaust manifold, 1/2", and I am thinking of ordering some exhaust wrap (header wrap) to shield it.  At this moment I am also looking at rerouting the oil line but there don't seem to be many options.  It is running and flying great but I have to keep my eye on that area.  It doesn't show any signs of overheating the oil line yet though.



Rich

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sun Jul 13, 2008 3:41 pm Post subject: High Oil Pressure

Keep a real close eye on that solder joint.  After a few hours you may find

cracking at the edge of where the solder permeated the wire.  I have a

friend who used to do the same fix on older cars.  The fix lasted less than

a year on average.  A new crimp fitting would last a long time.

Noel



--

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Roger Lee

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

Posted: Sun Jul 13, 2008 6:24 pm Post subject: Re: High Oil Pressure

Hi Rich,



I wrapped my exhaust pipes on my Filght Design CT. I wrapped the header coming right out of the exhaust and down to the muffler including the knuckled joint. It has made a world of difference in high temps in the immediate area of the exhaust pipes and no more blow-by of exhaust gases out past the joint. This made all my surrounding hoses and wires and engine mounts much cooler. The header wrap I used is the 2" and then over wrap each inch. My exhaust pipe was 15" long and took about 74" of 2" wrap. After I land I can actually put my hand on my exhaust pipes. The wrap company claims a 70% decrease in temps, but who knows the real truth. You will not notice any difference if you have EGT probes. I have a Dynon system and it didn't make a bit of difference in my temps.

You can by the wrap at most automotive stores. 50' is about $45. I would recommend the header wrap to anyone. Flight Design gave me a factory approval with out any problems.

_________________
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: Sun Jul 13, 2008 7:13 pm Post subject: Re: High Oil Pressure

I checked my local auto  store and the price was $56 for 50' so I went to Aircraft Spruce and got the "Exhaust insulating wrap" at 1" x 15' at $12 w/shipping.  Think that is all I need for that area.  I hope I don't cause a hot spot but I didnt know and after Roger said he is using it everywhere, it sounds good.  I use the Dynon D-100 also.



I also ordered a #6 multistrand with crimp on lugs to replace that ground wire I soldered.  I am out in the sticks so the auto stores only have big wire and lugs.  I agree on the solder having limited life.  Sure fixed my oil sender problem though.



The new radius of that oil line from the suction input to the oil cooler is 6" vs 3 inches now by using some brass extensions on the cooler.  The 43.13 is great if you read it right.  That bad oil hose had 160 hours on it with no signs of overheating from the exhaust even though it was within 1/2"  It is right in front where the ram air blows directly on it which may have helped.



thanks

Rich

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