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oil pressure guage problem

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jlsk1(at)frontiernet.net
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Posted: Wed Mar 04, 2009 3:47 pm Post subject: oil pressure guage problem

Guys  (& Gals)I`m finishing my 912 install  & hit a small snag. The oil pressure sender has 4 wires. The (Westach)oil  pressure guage has 6. The 4 that go to the sender from the guage are readily  identified, the other 2,are , 1 black (ground ) 1 red, for (power supply).  Problem. When I introduced power (12 V) to the guage, it imediately pegged  "full" to the right, When I disconnected the sender, it went to "60 lbs".   When I disconnect the ground wire, whether the sender was connected or not, it  stayed at "0". Obviously the engine was not running, & I have double checked  that it is connected as I have explained. This guage & sender combo was used  in a plane before, all I did was move it from one to another. No paperwork on  the guage. Did I screw something up that I missed? any Ideas?

 Thanks in advance, 

  

 Jim Kmet

 getting close to a 912 pwered  Mk-3C

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Mar 04, 2009 4:19 pm Post subject: oil pressure guage problem

Jim K:

  

 Did you ground the engine to the airframe with a  good sized ground cable or strap?

  

 I had a hell of a time with my gauges when I  initially installed a 912 on my mkIII.  Come to find out, I had forgotten  to ground engine to airframe.

  

 john h

 mkIII

  

  

 [quote]    

   Guys  (& Gals)I`m finishing my 912    install & hit a small snag. The oil pressure sender has 4 wires. The    (Westach)oil pressure guage has 6. The 4 that go to the sender from the guage    are readily identified, the other 2,are , 1 black (ground ) 1 red, for    (power supply). Problem. When I introduced power (12 V) to the guage, it    imediately pegged "full" to the right, When I disconnected the sender, it went    to "60 lbs".  When I disconnect the ground wire, whether the sender was    connected or not, it stayed at "0". Obviously the engine was not running,    & I have double checked that it is connected as I have explained. This    guage & sender combo was used in a plane before, all I did was move it    from one to another. No paperwork on the guage. Did I screw something up that    I missed? any Ideas?

   Thanks in advance, 

    

   Jim Kmet

   getting close to a 912 pwered Mk-3C

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

mdnanwelch7(at)hotmail.co
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Posted: Wed Mar 04, 2009 4:46 pm Post subject: oil pressure guage problem

Jim C

 

  When you applied the 12V C and it pegged the gauge C it sounds like you hooked up the sending unit's voltage input wire.   The sending unit will be sending millivolts to the gauge (when the gauge sees pressure)

  

   Go to Westburg gauges for your particular oil gauge and check out their wiring diagram for you.    I don't know your gauge model C but here's oner of their instruction pages.

  

 http://www.westach.com/instructions/2C8.JPG  or  www.westach.com

  

  

 Good luck C

 Mike Welch

  

 do not archive



 



    



 From: jlsk1(at)frontiernet.net

To: kolb-list(at)matronics.com

Subject: Kolb-List: oil pressure guage problem

Date: Wed C 4 Mar 2009 17:47:02 -0600

    Guys  (& Gals)I`m finishing my 912 install & hit a small snag. The oil pressure sender has 4 wires. The (Westach)oil pressure guage has 6. The 4 that go to the sender from the guage are readily identified C the other 2 Care  C 1 black (ground ) 1 red C for (power supply). Problem. When I introduced power (12 V) to the guage C it imediately pegged "full" to the right C When I disconnected the sender C it went to "60 lbs".  When I disconnect the ground wire C whether the sender was connected or not C it stayed at "0". Obviously the engine was not running C & I have double checked that it is connected as I have explained. This guage & sender combo was used in a plane before C all I did was move it from one to another. No paperwork on the guage. Did I screw something up that I missed? any Ideas?

 Thanks in advance C 

  

 Jim Kmet

 getting close to a 912 pwered Mk-3C

 	  Quote: 	
		  



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jlsk1(at)frontiernet.net
Guest

Posted: Wed Mar 04, 2009 5:08 pm Post subject: oil pressure guage problem

Yep, engine grounded with a pencil sized wire..  The oil temp guage verified this .I just found Westachs website, &  on the troubleshooting page it sez to make sure the sender & gauge are  grounded at the exact same point. I just tried to call them to confirm that the  black wire from the sender is the ground wire.Do you think I`m safe in assuming  that is the case? seems odd that there would be 2 black wires comming from the  back of the guage, & both are grounds, one to airframe & 1 to sender,  but need to be grounded at the same place.

  

 Jim

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jlsk1(at)frontiernet.net
Guest

Posted: Wed Mar 04, 2009 5:11 pm Post subject: oil pressure guage problem

Mike, Thanks for the point to the wiring diagrams, I found  the 6 pin connector guage that I have, (actually, there were 2 models, but wired  up the same. Couldn`t read the stuff on the website, but they came out clear  when I printed them.There IS a red wire that goes directly to a 12-24v source.  Other than grounding the sender to the same point as the guage as mentioned on  the trobleshooting page, I wired this thing up correctly according to the  diagrams.  I`ll follow this up with a call to them Thursday, to ask the  grounding q.

 Thanks all, 

  

 Jim

  

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