RV-List Digest Archive

Sun 04/22/12


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 07:29 AM - Re: RV-List Digest: 2 Msgs - 04/21/12 (neilc)
     2. 07:40 PM - Re: Re: RV-List Digest: 2 Msgs - 04/21/12 (R.C. Flyer)
     3. 10:35 PM - Re: Re: RV-List Digest: 2 Msgs - 04/21/12 (John D)
 
 
 


Message 1


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    Time: 07:29:54 AM PST US
    From: neilc <neilc2@mindspring.com>
    Subject: Re: RV-List Digest: 2 Msgs - 04/21/12
    I would recomend screwing in a pressure gauge to check actual engine oil pressure neil c -----Original Message----- >From: RV-List Digest Server <rv-list@matronics.com> >Sent: Apr 22, 2012 12:00 AM >To: RV-List Digest List <rv-list-digest@matronics.com> >Subject: RV-List Digest: 2 Msgs - 04/21/12 > >* > > ================================================= > Online Versions of Today's List Digest Archive > ================================================= > >Today's complete RV-List Digest can also be found in either of the >two Web Links listed below. The .html file includes the Digest formatted >in HTML for viewing with a web browser and features Hyperlinked Indexes >and Message Navigation. The .txt file includes the plain ASCII version >of the RV-List Digest and can be viewed with a generic text editor >such as Notepad or with a web browser. > >HTML Version: > > http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 12-04-21&Archive=RV > >Text Version: > > http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 12-04-21&Archive=RV > > > =============================================== > EMail Version of Today's List Digest Archive > =============================================== > > > ---------------------------------------------------------- > RV-List Digest Archive > --- > Total Messages Posted Sat 04/21/12: 2 > ---------------------------------------------------------- > > >Today's Message Index: >---------------------- > > 1. 05:20 AM - Re: Oil Presure Gauge (Doug Gray) > 2. 09:23 AM - Re: Oil Presure Gauge (Scott) > > > >________________________________ Message 1 _____________________________________ > > >Time: 05:20:53 AM PST US >Subject: Re: RV-List: Oil Presure Gauge >From: Doug Gray <dgra1233@bigpond.net.au> > >R.C., > >Yes a shop could sort this out for you, just apply cash. > >The multimeter looks to be just the ticket. I see it is already set on the o >hms scale, so here is a plan.... > >1. Disconnect the transducer, check the resistance between the terminal and t >he transducer body - this should be close to the 240 ohms. If not then you d >o not have the correct transducer. I notice you purchased the transducer fro >m ACS, but the gauge is from Vans. With this type of gauge the transducer h >as to have the resistance profile with pressure to match the gauge. I belie >ve Vans sells the correct transducer, I am uncertain if this matches anythin >g from ACS. > >2. Now reconnect the transducer and disconnect the Sense terminal and the gr >ound from the gauge. The sense wire should go directly to the transducer te >rminal, and the ground should connect to the case of the transducer (probabl >y via the airframe ground) c- measure the resistance between the two free en >ds - this should measure the same as for the transducer alone - about 240 oh >ms. If not then there is a wiring issue between the transducer and the sens >e terminal or to ground. Fix this if it not correct. > >If necessary run a new wire between the gauge and the transducer terminal, a >nd run a new ground wire between the case of the transducer to the gauge gro >und. Retest for the 240 ohms. > >3. Check the airframe ground connection (this is the negative of the battery >, or the engine case) to the transducer case. The should be less than 0.1 oh >m. If not find out why and fix. > >4. Finally check the gauge itself - get hold of a 100ohm resistor - wire it b >etween the gauge sense terminal and the gauge ground. Gauge supply terminal > should already be wired to the supply - this should be 12-14 volts relative > to the ground. Gauge ground wired to ground. With the 100ohm resistor in p >lace and power applied the gauge should indicate close to 50psi. If it does > your gauge should be ok. > >Much easier to do than to describe. > >Doug > > >Sent from my iPad > >On 21/04/2012, at 4:55 PM, "R.C. Flyer" <smirdrv@hotmail.com> wrote: > >> Doug, >> I installed a new sending unit from ACS this evening and fired up the O-32 >0-160........same, same. I checked the connections under the dash in the cow >l; found a loose connection. So I put a new connector on the end and tighten >ed it down.. no joy. I have this meter pictured, but am a novice and not sur >e how to set it up to check the values on the gauge. Is this something that a > shop can check is I take it in to them? I also have an ACK-30 encoder that > doesn't want to transmit the altitude. Would that have to be checked in the > plane, or can it be bench checked? Thanks. >> >> R.C. >> >> >> Subject: Re: RV-List: Oil Presure Gauge >> From: dgra1233@bigpond.net.au >> Date: Sat, 14 Apr 2012 09:37:15 +1000 >> To: rv-list@matronics.com >> >> Some data points that may help: >> >> For a working Vans Oil Pressure gauge.... >> >> The transducer should measure about 240 ohms at atmospheric pressure (zero >) - mine measured 238 ohms. >> >> I tested the gauge with fixed value resistors, >> >> 152 ohms gave 23 psi, >> 98ohms gave 51psi, >> 60 ohms gave 81 psi and >> 41ohms gave 95psi. >> >> So armed with a multimeter you should be able to track down where you have > a problem. A poor contact in the circuit will increase the resistance indic >ating a lower pressure, but any number of Faults could give the indication. >> >> I recommend you do not fly without resolving the issue. >> >> Doug >> >> >> On 14/04/2012, at 4:36 AM, "R.C. Flyer" <smirdrv@hotmail.com> wrote: >> >> Thanks to you all for your input. Weather permitting, I'll locate the iss >ue and report the findings. >> R.C. >> >> From: johnd@wlcwyo.com >> To: rv-list@matronics.com >> Date: Fri, 13 Apr 2012 09:29:32 -0700 >> Subject: RE: RV-List: Oil Presure Gauge >> >> I had the same problem with Van oil pressure gauge, except mine would be o >k at startup and after 15 or 20 minutes it would show 25 to 30 psi. >> >> I replaced the sending unit twice. Luckily I also installed an idiot light > with pressure sender for the light at 45 psi. The light never came on. I in >stalled the idiot light so I wouldn=99t forget to turn the master off a >t shutdown. >> >> I ended up replacing the gauge with a Electronic International oil pressur >e and oil temp combination gauge. After replacement oil pressure stayed at 7 >0 psi and never wavered. >> >> >> >> John L. Danielson >> Senior Engineering Technician >> WLC Engineering, Surveying & Planning >> 200 Pronghorn St., Casper, WY 82601 >> 307-266-2524 >> >> <image001.jpg> >> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matr >onics.com] On Behalf Of Tom & Cathy Ervin >> Sent: Friday, April 13, 2012 5:43 AM >> To: rv-list@matronics.com >> Subject: Re: RV-List: Oil Presure Gauge >> >> >> >> R.C., >> I have all the Van's gauges in my panel with the exception of voltage > & manifold pressure and never had an issue in 100 plus hours. >> Check all your connections...good grounds are a must...to make sure t >hey are clean and tight. If everything looks flight ready then I would start > by checking the sending unit to make sure it's functioning properly. >> Tom in Ohio RV >6-A >> >> I have an Oil pressure gauge that came with the project I purchased. I've b >een flying with it for just a few hours and yesterday after start up, the ga >uge wouldn't rise above 20psi. The gauge has a picture of Van's Plane @ the b >ottom. I seem to remember hearing about these not being very reliable. Does t >his sound familiar to anyone? After checking under the cowl, then idling for > a while and monitoring the CHT & Oil temps, I took a couple of circuits aro >und the pattern.....all was normal except for the lack of Oil pressure at it >'s usual reading. I plan on pulling the pressure line from the engine to the > sending unit to verify that it is not clogged, and already checked the sign >al line to the gauge. Any other suggestions? Thanks in advance. >> >> R.C. >> >> >> >> >> >> >> get=_blank>http://www.matronics.com/Navigator?RV-List >> ttp://forums.matronics.com >> =_blank>http://www.matronics.com/contribution >> >> <DSC01027.JPG> > >________________________________ Message 2 _____________________________________ > > >Time: 09:23:10 AM PST US >From: Scott <acepilot@bloomer.net> >Subject: Re: RV-List: Oil Presure Gauge > > >Or maybe one could use a "real" oil pressure gauge with an oil line >coming to it. The downside would be the possibility of leaks inside the >cabin area. :( > > >On 4-21-2012 12:17, Doug Gray wrote: >> R.C., >> >> Yes a shop could sort this out for you, just apply cash. >> > > > > > > > > >


    Message 2


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    Time: 07:40:50 PM PST US
    From: "R.C. Flyer" <smirdrv@hotmail.com>
    Subject: Re: RV-List Digest: 2 Msgs - 04/21/12
    Today I performed checks as per Dougs instructions and beleive the problem to be the gauge. > Date: Sun=2C 22 Apr 2012 07:28:11 -0700 > From: neilc2@mindspring.com > To: rv-list@matronics.com > Subject: RV-List: Re: RV-List Digest: 2 Msgs - 04/21/12 > > > I would recomend screwing in a pressure gauge to check actual engine oil pressure > neil c > > -----Original Message----- > >From: RV-List Digest Server <rv-list@matronics.com> > >Sent: Apr 22=2C 2012 12:00 AM > >To: RV-List Digest List <rv-list-digest@matronics.com> > >Subject: RV-List Digest: 2 Msgs - 04/21/12 > > > >* > > > > ======================= = > > Online Versions of Today's List Digest Archive > > ======================= = > > > >Today's complete RV-List Digest can also be found in either of the > >two Web Links listed below. The .html file includes the Digest formatted > >in HTML for viewing with a web browser and features Hyperlinked Indexes > >and Message Navigation. The .txt file includes the plain ASCII version > >of the RV-List Digest and can be viewed with a generic text editor > >such as Notepad or with a web browser. > > > >HTML Version: > > > > http://www.matronics.com/digest/digestview.php?Style=82701&View=htm l&Chapter 12-04-21&Archive=RV > > > >Text Version: > > > > http://www.matronics.com/digest/digestview.php?Style=82701&View=txt &Chapter 12-04-21&Archive=RV > > > > > > ======================= ======================== > > EMail Version of Today's List Digest Archive > > ======================= ======================== > > > > > > ---------------------------------------------------------- > > RV-List Digest Archive > > --- > > Total Messages Posted Sat 04/21/12: 2 > > ---------------------------------------------------------- > > > > > >Today's Message Index: > >---------------------- > > > > 1. 05:20 AM - Re: Oil Presure Gauge (Doug Gray) > > 2. 09:23 AM - Re: Oil Presure Gauge (Scott) > > > > > > > >________________________________ Message 1 _____________________________ ________ > > > > > >Time: 05:20:53 AM PST US > >Subject: Re: RV-List: Oil Presure Gauge > >From: Doug Gray <dgra1233@bigpond.net.au> > > > >R.C.=2C > > > >Yes a shop could sort this out for you=2C just apply cash. > > > >The multimeter looks to be just the ticket. I see it is already set on t he o > >hms scale=2C so here is a plan.... > > > >1. Disconnect the transducer=2C check the resistance between the termina l and t > >he transducer body - this should be close to the 240 ohms. If not then y ou d > >o not have the correct transducer. I notice you purchased the transducer fro > >m ACS=2C but the gauge is from Vans. With this type of gauge the transdu cer h > >as to have the resistance profile with pressure to match the gauge. I be lie > >ve Vans sells the correct transducer=2C I am uncertain if this matches a nythin > >g from ACS. > > > >2. Now reconnect the transducer and disconnect the Sense terminal and th e gr > >ound from the gauge. The sense wire should go directly to the transducer te > >rminal=2C and the ground should connect to the case of the transducer (p robabl > >y via the airframe ground) c- measure the resistance between the two fre e en > >ds - this should measure the same as for the transducer alone - about 24 0 oh > >ms. If not then there is a wiring issue between the transducer and the s ens > >e terminal or to ground. Fix this if it not correct. > > > >If necessary run a new wire between the gauge and the transducer termina l=2C a > >nd run a new ground wire between the case of the transducer to the gauge gro > >und. Retest for the 240 ohms. > > > >3. Check the airframe ground connection (this is the negative of the bat tery > >=2C or the engine case) to the transducer case. The should be less than 0.1 oh > >m. If not find out why and fix. > > > >4. Finally check the gauge itself - get hold of a 100ohm resistor - wire it b > >etween the gauge sense terminal and the gauge ground. Gauge supply termi nal > > should already be wired to the supply - this should be 12-14 volts rela tive > > to the ground. Gauge ground wired to ground. With the 100ohm resistor i n p > >lace and power applied the gauge should indicate close to 50psi. If it d oes > > your gauge should be ok. > > > >Much easier to do than to describe. > > > >Doug > > > > > >Sent from my iPad > > > >On 21/04/2012=2C at 4:55 PM=2C "R.C. Flyer" <smirdrv@hotmail.com> wrote: > > > >> Doug=2C > >> I installed a new sending unit from ACS this evening and fired up the O-32 > >0-160........same=2C same. I checked the connections under the dash in t he cow > >l=3B found a loose connection. So I put a new connector on the end and t ighten > >ed it down.. no joy. I have this meter pictured=2C but am a novice and n ot sur > >e how to set it up to check the values on the gauge. Is this something t hat a > > shop can check is I take it in to them? I also have an ACK-30 encoder t hat > > doesn't want to transmit the altitude. Would that have to be checked in the > > plane=2C or can it be bench checked? Thanks. > >> > >> R.C. > >> > >> > >> Subject: Re: RV-List: Oil Presure Gauge > >> From: dgra1233@bigpond.net.au > >> Date: Sat=2C 14 Apr 2012 09:37:15 +1000 > >> To: rv-list@matronics.com > >> > >> Some data points that may help: > >> > >> For a working Vans Oil Pressure gauge.... > >> > >> The transducer should measure about 240 ohms at atmospheric pressure ( zero > >) - mine measured 238 ohms. > >> > >> I tested the gauge with fixed value resistors=2C > >> > >> 152 ohms gave 23 psi=2C > >> 98ohms gave 51psi=2C > >> 60 ohms gave 81 psi and > >> 41ohms gave 95psi. > >> > >> So armed with a multimeter you should be able to track down where you have > > a problem. A poor contact in the circuit will increase the resistance i ndic > >ating a lower pressure=2C but any number of Faults could give the indica tion. > >> > >> I recommend you do not fly without resolving the issue. > >> > >> Doug > >> > >> > >> On 14/04/2012=2C at 4:36 AM=2C "R.C. Flyer" <smirdrv@hotmail.com> wrot e: > >> > >> Thanks to you all for your input. Weather permitting=2C I'll locate th e iss > >ue and report the findings. > >> R.C. > >> > >> From: johnd@wlcwyo.com > >> To: rv-list@matronics.com > >> Date: Fri=2C 13 Apr 2012 09:29:32 -0700 > >> Subject: RE: RV-List: Oil Presure Gauge > >> > >> I had the same problem with Van oil pressure gauge=2C except mine woul d be o > >k at startup and after 15 or 20 minutes it would show 25 to 30 psi. > >> > >> I replaced the sending unit twice. Luckily I also installed an idiot l ight > > with pressure sender for the light at 45 psi. The light never came on. I in > >stalled the idiot light so I wouldn=99t forget to turn the master off a > >t shutdown. > >> > >> I ended up replacing the gauge with a Electronic International oil pre ssur > >e and oil temp combination gauge. After replacement oil pressure stayed at 7 > >0 psi and never wavered. > >> > >> > >> > >> John L. Danielson > >> Senior Engineering Technician > >> WLC Engineering=2C Surveying & Planning > >> 200 Pronghorn St.=2C Casper=2C WY 82601 > >> 307-266-2524 > >> > >> <image001.jpg> > >> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@ matr > >onics.com] On Behalf Of Tom & Cathy Ervin > >> Sent: Friday=2C April 13=2C 2012 5:43 AM > >> To: rv-list@matronics.com > >> Subject: Re: RV-List: Oil Presure Gauge > >> > >> > >> > >> R.C.=2C > >> I have all the Van's gauges in my panel with the exception of voltage > > & manifold pressure and never had an issue in 100 plus hours. > >> Check all your connections...good grounds are a must...to make sure t > >hey are clean and tight. If everything looks flight ready then I would s tart > > by checking the sending unit to make sure it's functioning properly. > >> Tom in Ohio RV > >6-A > >> > >> I have an Oil pressure gauge that came with the project I purchased. I 've b > >een flying with it for just a few hours and yesterday after start up=2C the ga > >uge wouldn't rise above 20psi. The gauge has a picture of Van's Plane @ the b > >ottom. I seem to remember hearing about these not being very reliable. D oes t > >his sound familiar to anyone? After checking under the cowl=2C then idli ng for > > a while and monitoring the CHT & Oil temps=2C I took a couple of circui ts aro > >und the pattern.....all was normal except for the lack of Oil pressure a t it > >'s usual reading. I plan on pulling the pressure line from the engine to the > > sending unit to verify that it is not clogged=2C and already checked th e sign > >al line to the gauge. Any other suggestions? Thanks in advance. > >> > >> R.C. > >> > >> > >> > >> > >> > >> > >> get=_blank>http://www.matronics.com/Navigator?RV-List > >> ttp://forums.matronics.com > >> =_blank>http://www.matronics.com/contribution > >> > >> <DSC01027.JPG> > > > >________________________________ Message 2 _____________________________ ________ > > > > > >Time: 09:23:10 AM PST US > >From: Scott <acepilot@bloomer.net> > >Subject: Re: RV-List: Oil Presure Gauge > > > > > >Or maybe one could use a "real" oil pressure gauge with an oil line > >coming to it. The downside would be the possibility of leaks inside the > >cabin area. :( > > > > > >On 4-21-2012 12:17=2C Doug Gray wrote: > >> R.C.=2C > >> > >> Yes a shop could sort this out for you=2C just apply cash. > >> > > > > > > > > > > > > > > > > > > > > =========== =========== =========== =========== > > >


    Message 3


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    Time: 10:35:55 PM PST US
    From: "John D" <altoq@cebridge.net>
    Subject: Re: RV-List Digest: 2 Msgs - 04/21/12
    From: R.C. Flyer Sent: Sunday, April 22, 2012 9:39 PM Subject: RE: RV-List: Re: RV-List Digest: 2 Msgs - 04/21/12 Today I performed checks as per Dougs instructions and beleive the problem to be the gauge. I don=99;t know the setup you have but, if the sending unit is screwed into an anodized oil manifold, that could a problem. Resistance between that manifold and the sending unit should be Zero. The best way to make sure is to run a ground wire between the sending unit body and a known good GROUND. John D




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