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Oil Pressure Sending unit location

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DanM

Joined: 16 Nov 2006
Posts: 64
Location: Kingsburg, Calif.

Posted: Mon Aug 20, 2007 8:54 am Post subject: Oil Pressure Sending unit location

Can the oil pressure sending unit be located on the lower port. My new sending unit is larger diameter than the factory unti and won't fit in the regular location. Attached photos show standard location and the plug port I want to use.



Thanks in advance

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_________________
Dan Mc Intyre
Kitfox IV
Jabiru 2200 SN 1311 , 59.7 hours
Sensenich 62x46
N443DM

matronics(at)rtist.nl
Guest

Posted: Mon Aug 20, 2007 9:28 am Post subject: Oil Pressure Sending unit location

 	  Quote: 	
		  From what I understand you can place it at some other place in the oil 

circuit but your pressure reading will be a bit too optimistic. The factory 
	


oil sender is located just before the oil pump, where the oil pressure is 

the lowest in the chain. If you can, run both the original sender and the 

new sender side by side and see what the difference is.



Rob



---

andy(at)suncoastjabiru.co
Guest

Posted: Mon Aug 20, 2007 10:51 am Post subject: Oil Pressure Sending unit location

Martin,



Rob's almost right, but the standard position for the sender is right AFTER

the pump, so it'll measure higher than the lower position, which despite it

being only just below the sender, is actually at the other end of the oil

system. Between the two points are the oil cooler and filter, but the

'lower' point is the gallery supplying the bearings etc. My preference would

be to put the sender at the lower point, but this would have the sender

possibly interfering with the prop flange or other forward parts as it would

stand-out in front of the engine. If you can get a sender into the lower

point, by all means use it.



Andy

Suncoast Sportplanes, Inc.

39248 South Ave, Zephyrhills, FL 33542

Tel: (813) 779 2324 Fax: (813) 779 2246

www.suncoastjabiru.com



--

matronics(at)rtist.nl
Guest

Posted: Mon Aug 20, 2007 11:46 am Post subject: Oil Pressure Sending unit location

Hi Andy,



I just checked the drawings and it appears we're both wrong.. Looking at 

page 93 of the inspection and maintenance manual (drawing 9493013-1), it 

shows that oil from the oil pump goes to the 'donut' adapter, from there 

through the oil cooler, then through the oil filter, and then into the oil 

gallery. The pressure sensor sits right at the exit of the oil filter, but 

before the oil gallery.



We have a bit low oil pressure reading when the run-in oil is hot, and we 

connected a secondary sensor to the line feeding the oil cooler using a 'T' 

adapter. Pressure reads about 5 psi higher than the original sensor.



---

DanM

Joined: 16 Nov 2006
Posts: 64
Location: Kingsburg, Calif.

Posted: Tue Aug 21, 2007 8:48 am Post subject: Re: Oil Pressure Sending unit location

So guys, is it ok to use the lower port?

_________________
Dan Mc Intyre
Kitfox IV
Jabiru 2200 SN 1311 , 59.7 hours
Sensenich 62x46
N443DM

andy(at)suncoastjabiru.co
Guest

Posted: Tue Aug 21, 2007 9:24 am Post subject: Oil Pressure Sending unit location

Dan,



Yes, it's OK to use the lower port. I've looked at the Drawing Rob refers

to, and I think it's wrong. It's ambiguous the way it's drawn, showing the

connection through the oil pump output port, and down into the gallery, when

in fact the connection should stop at the (upper) pump output port. I'll

clarify with Jabiru and will post here if different. However, I've measured

the pressure at both points, and the lower port is definitely at a lower

pressure, consistent with it being after the cooler and filter. I note that

the drawing isn't included in the later manual version for hydraulic

lifters!



Andy

Suncoast Sportplanes, Inc.

39248 South Ave, Zephyrhills, FL 33542

Tel: (813) 779 2324 Fax: (813) 779 2246

www.suncoastjabiru.com



--

matronics(at)rtist.nl
Guest

Posted: Tue Aug 21, 2007 10:52 am Post subject: Oil Pressure Sending unit location

Andy,



Thanks for looking into this. I'm very interested to hear what Jabiru's take

is on this.



Rob

---

DanM

Joined: 16 Nov 2006
Posts: 64
Location: Kingsburg, Calif.

Posted: Tue Aug 21, 2007 11:05 am Post subject: Re: Oil Pressure Sending unit location

Thanks Andy & Rob, I'll watch the forum for any additional info on this subject.

_________________
Dan Mc Intyre
Kitfox IV
Jabiru 2200 SN 1311 , 59.7 hours
Sensenich 62x46
N443DM

andy(at)suncoastjabiru.co
Guest

Posted: Tue Sep 04, 2007 5:32 am Post subject: Oil Pressure Sending unit location

Rob and all,



I got confirmation from Jabiru that the drawing in the manual is (at best)

misleading and the routing of the oil circuit is as I described. For those

who didn't see the earlier posts, there was confusion as to the sensing

location of the oil sender. It senses the pressure right after the pump and

in some (instrument) setups, this can show-up as pressure fluctuations on

the gauge during normal running. The lower sensing location - just

underneath the electric sender - is at the end of the oil gallery supplying

the bearings. Between those two points (despite being close together) are

the oil cooler, the oil filter and the pressure relief valve. If you want to

sense the oil pressure at the lower point, you will notice a pressure

difference of some 50kPa lower (7 psi) than the standard position, but the

lower position gives a steadier reading and reflects the pressure supplied

to the bearings before the oil returns to the case.



I've asked Jabiru to amend the drawings of the respective oil circuit

schematics in the manuals to make this clearer. 



Andy Silvester



Suncoast Sportplanes, Inc.

39248 South Ave, Zephyrhills, FL 33542

Tel: (813) 779 2324 Fax: (813) 779 2246

www.suncoastjabiru.com



--

rshannon(at)cruzcom.com
Guest

Posted: Wed Sep 05, 2007 6:56 am Post subject: Oil Pressure Sending unit location

Andy,



Can you clarify the second location? By "just underneath the electric 

sender" are you referring to the oil pressure switch?



Ron



 	  Quote: 	
		   Rob and all,

 

 I got confirmation from Jabiru that the drawing in the manual is (at best)

 misleading and the routing of the oil circuit is as I described. For those

 who didn't see the earlier posts, there was confusion as to the sensing

 location of the oil sender. It senses the pressure right after the pump and

 in some (instrument) setups, this can show-up as pressure fluctuations on

 the gauge during normal running. The lower sensing location - just

 underneath the electric sender - is at the end of the oil gallery supplying

 the bearings. Between those two points (despite being close together) are

 the oil cooler, the oil filter and the pressure relief valve. If you want to

 sense the oil pressure at the lower point, you will notice a pressure

 difference of some 50kPa lower (7 psi) than the standard position, but the

 lower position gives a steadier reading and reflects the pressure supplied

 to the bearings before the oil returns to the case.

 

 I've asked Jabiru to amend the drawings of the respective oil circuit

 schematics in the manuals to make this clearer. 

 

 Andy Silvester

 

 Suncoast Sportplanes, Inc.

 39248 South Ave, Zephyrhills, FL 33542

 Tel: (813) 779 2324 Fax: (813) 779 2246

 www.suncoastjabiru.com

wypaul

Joined: 08 Jun 2007
Posts: 24

Posted: Wed Sep 05, 2007 8:54 am Post subject: Re: Oil Pressure Sending unit location

See the attached pix.

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_________________
Paul Spackman
Q-2 Jabiru 3300

Andy Silvester

Joined: 10 Jan 2006
Posts: 18
Location: Marica, Rio de Janeiro, Brazil

Posted: Wed Sep 05, 2007 9:22 am Post subject: Re: Oil Pressure Sending unit location

Perfect - Thanks, Paul. This is why the web-based format of this list is soooo much better than the YahooGroups offering!

Andy

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