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Oil Pressure on Rotax 912UL

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dgraham7(at)TWCNY.RR.COM
Guest

Posted: Sat Aug 16, 2014 1:23 pm Post subject: Oil Pressure on Rotax 912UL

Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce. 

My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120. 

We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

Regards,

Damien Grtaham

N48TK

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asandul

Joined: 12 Feb 2014
Posts: 12

Posted: Sat Aug 16, 2014 3:03 pm Post subject: Oil Pressure on Rotax 912UL

Had the same problem and I had ordered the 5 bar sender and not 10 bar sender. They will exchange if that is the problem. 



Sent from my iPhone



 	  Quote: 	
		   On Aug 16, 2014, at 5:22 PM, Damien Graham <dgraham7(at)TWCNY.RR.COM> wrote:

 

 

 

 Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce. 

 My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120. 

 We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

 Regards,

 Damien Grtaham

 N48TK

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_________________
ALAN

dgraham7(at)TWCNY.RR.COM
Guest

Posted: Sat Aug 16, 2014 4:07 pm Post subject: Oil Pressure on Rotax 912UL

Thanks very much.

Regards,

Damien



Sent from my iPad



 	  Quote: 	
		   On Aug 16, 2014, at 7:02 PM, Alan Sandul <asandul(at)yahoo.com> wrote:

 

 

 

 Had the same problem and I had ordered the 5 bar sender and not 10 bar sender. They will exchange if that is the problem. 

 

 Sent from my iPhone

 

> On Aug 16, 2014, at 5:22 PM, Damien Graham <dgraham7(at)TWCNY.RR.COM> wrote:

> 

> 

> 

> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce. 

> My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120. 

> We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

> Regards,

> Damien Grtaham

> N48TK

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craig(at)craigandjean.com
Guest

Posted: Sat Aug 16, 2014 4:29 pm Post subject: Oil Pressure on Rotax 912UL

I think "bar 5" or "bar 10" is stamped on the side of the sensor's hex nut.



-- Craig



On Sat, Aug 16, 2014 at 5:07 PM, Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)>

  

 Thanks very much.

 Regards,

 Damien

 

 Sent from my iPad

 

 > On Aug 16, 2014, at 7:02 PM, Alan Sandul <asandul(at)yahoo.com (asandul(at)yahoo.com)> wrote:

 >

 > --> RotaxEngines-List message posted by: Alan Sandul <asandul(at)yahoo.com (asandul(at)yahoo.com)>

 >

 > Had the same problem and I had ordered the 5 bar sender and not 10 bar sender. They will exchange if that is the problem.

 >

 > Sent from my iPhone

 >

 >> On Aug 16, 2014, at 5:22 PM, Damien Graham <dgraham7(at)TWCNY.RR.COM (dgraham7(at)TWCNY.RR.COM)> wrote:

 >>

 >> --> RotaxEngines-List message posted by: Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)>

 >>

 >> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce.

  >> My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120.

  >> We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

  >> Regards,

 >> Damien Grtaham

 >> N48TK

 >

 >

 >

 >

 >

 

 

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Roger Lee

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

Posted: Sun Aug 17, 2014 6:39 am Post subject: Re: Oil Pressure on Rotax 912UL

You need a gauge to go up to at least 100 psi. The max oil pressure can be up to 72 psi.

If the oil pressure sender has something on the threads it won't ground properly. Make sure all your grounds are tight because this will cause this type of issue. Senders are more often at fault than the gauge itself by a long shot.

Before you do anything put a mechanical gauge on the oil system to check the real pressure. This can be done down at the sender. Usually the port right in front of the oil pressure sender can be used. It is only plugged off with a screw. It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace Hardware. If you have the old style oil pressure regulator ball-bearing this migh be adding to your problems. Even if you don't get the extended TBO it is worth spending the $75 and ten minutes to install it.

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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

dgraham7(at)TWCNY.RR.COM
Guest

Posted: Sun Aug 17, 2014 9:36 am Post subject: Oil Pressure on Rotax 912UL

Thanks Roger. I always appreciate your advice.

Regards,

Damien

On Aug 17, 2014, at 10:39 AM, Roger Lee <ssadiver1(at)yahoo.com> wrote:



 	  Quote: 	
		   

 

 You need a gauge to go up to at least 100 psi. The max oil pressure can be up to 72 psi.

 If the oil pressure sender has something on the threads it won't ground properly. Make sure all your grounds are tight because this will cause this type of issue. Senders are more often at fault than the gauge itself by a long shot.

 Before you do anything put a mechanical gauge on the oil system to check the real pressure. This can be done down at the sender. Usually the port right in front of the oil pressure sender can be used. It is only plugged off with a screw. It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace Hardware. If you have the old style oil pressure regulator ball-bearing this migh be adding to your problems. Even if you don't get the extended TBO it is worth spending the $75 and ten minutes to install it.

 

 --------

 Roger Lee

 Tucson, Az.

 Light Sport Repairman - Maintenance Rated

 Rotax Repair Center - Heavy Maint. Rated

 Home 520-574-1080  TRY HOME FIRST

 Cell 520-349-7056

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=428603#428603

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dgraham7(at)TWCNY.RR.COM
Guest

Posted: Sun Aug 17, 2014 9:37 am Post subject: Oil Pressure on Rotax 912UL

Thanks Craig. I found the 10 bar stamp on the original sender. I will order the correct replacement. Thanks again.Regards,

Damien

On Aug 16, 2014, at 8:27 PM, Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)> wrote:

 	  Quote: 	
		  I think "bar 5" or "bar 10" is stamped on the side of the sensor's hex nut.



-- Craig



On Sat, Aug 16, 2014 at 5:07 PM, Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:

 	  Quote: 	
		  --> RotaxEngines-List message posted by: Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)>



Thanks very much.

Regards,

Damien



Sent from my iPad



 	  Quote: 	
		   On Aug 16, 2014, at 7:02 PM, Alan Sandul <asandul(at)yahoo.com (asandul(at)yahoo.com)> wrote:



 --> RotaxEngines-List message posted by: Alan Sandul <asandul(at)yahoo.com (asandul(at)yahoo.com)>



 Had the same problem and I had ordered the 5 bar sender and not 10 bar sender. They will exchange if that is the problem.



 Sent from my iPhone



> On Aug 16, 2014, at 5:22 PM, Damien Graham <dgraham7(at)TWCNY.RR.COM (dgraham7(at)TWCNY.RR.COM)> wrote:

>

> --> RotaxEngines-List message posted by: Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)>

>

> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce.

> My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120.

> We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

> Regards,

> Damien Grtaham

> N48TK




	




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 [quote][b]

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Sun Aug 17, 2014 9:48 am Post subject: Oil Pressure on Rotax 912UL

NOT LIKELY!

Since your VDO sending unit is ELECTRIC and since the sending unit has ONLY a low voltage and high voltage limit - Even it the real pressure increased to 500 PSI the output of the sending unit STILL would be ONLY the max allowed by the unit.  Ergo, it would NOT damage the indicator gauge.

 NOW!  What you and the group should do is take Voltage reading Vs Pressure indications.  Post those readings to the group and PLOT the resultants...  Voltage Vs Pressure.  Now, knowing those values you should be able to say:

 X Voltage (Low End) = X Pressure, Y Voltage (Middle) = Y Pressure, Z Voltage (High End) = Z Pressure and this would be Max Pressure readable by the gauge.

 Crazy question:  Is there a manual for the unit which gives a check value?

I also noticed there are a few different sending units...  Which unit do you have?  Which did you replace it with?  Here is a unit that reads from a Low of 11.4 PSI to a high of 150 PSI.  

 NOW! This unit even give a resistance value of 0 to 180 Ohms.  You can either read the output voltage across the sending unit or remove the wires and read the resistance.

 



But, the question is WHY is the pressure dropping each time?  COLD oil will cause high oil pressures and as the oil temp increases the pressure will drop.

 Is that what you are seeing?

 



Barry

 



On Sat, Aug 16, 2014 at 5:22 PM, Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: Damien Graham <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)>

  

 Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce.

  My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120.

  We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks.

  Regards,

 Damien Grtaham

 N48TK[b]

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