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ajroseca(at)nf.sympatico.
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 Posted: Sat Apr 03, 2010 1:55 pm Post subject: Oil pressure gauge |
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I am having a problem with the oil pressure gauge in my 701,
The meter jumps from 80 to 40 or back to 60..it is very erratic
I have replaced the gauge and sender three times .but each
gives problems after a short time. These gauges are electric.
If I replace it with a mechanical gauge it works fine...there are no joins
in the connecting wires but I think I will have to replace them.
anyone have any Ideas to cure the problem..The unit I installed recently
is Electronic but it gives me the same trouble.
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blackmore(at)platinum.ca
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| Posted: Sat Apr 03, 2010 2:30 pm Post subject: Oil pressure gauge |
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rene(at)felker.com
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| Posted: Sat Apr 03, 2010 5:24 pm Post subject: Oil pressure gauge |
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This may not apply, but on my RV-10 I had a bad ground connect and was having similar problems with my fuel pressure sender.
Rene'
801-721-6080
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Alvin Rose
Sent: Saturday, April 03, 2010 3:54 PM
To: zenith701801-list(at)matronics.com
Subject: Oil pressure gauge
I am having a problem with the oil pressure gauge in my 701,
The meter jumps from 80 to 40 or back to 60..it is very erratic
I have replaced the gauge and sender three times ..but each
gives problems after a short time. These gauges are electric.
If I replace it with a mechanical gauge it works fine...there are no joins
in the connecting wires but I think I will have to replace them.
anyone have any Ideas to cure the problem..The unit I installed recently
is Electronic but it gives me the same trouble.
| Quote: | | http://www.matronics.com/Navigator?Zenith701801-List |
01234567
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Sun Apr 04, 2010 5:20 am Post subject: Oil pressure gauge |
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Alvin, the general rule of thumb when dealing with an electrical gremlin in an aircraft is: Alway check the ground. I don't know why it is but the problems almost alway seem to be in the ground side of the circuit.
The potential ground issues that I can see in this circuit are:
1. Engine to airframe
2. gauge to ground buss
3. Battery ground (not likely as other issues would be apparent)
Hope this helps
Doug MacDonald
CH-701 Scratch Builder
Painting
Do Not Archive
--- On Sat, 4/3/10, Alvin Rose <ajroseca(at)nf.sympatico.ca> wrote:
| Quote: |
From: Alvin Rose <ajroseca(at)nf.sympatico.ca>
Subject: Oil pressure gauge
To: zenith701801-list(at)matronics.com
Received: Saturday, April 3, 2010, 4:54 PM
I am having a problem with the oil pressure gauge in my 701,
The meter jumps from 80 to 40 or back to 60..it is very erratic
I have replaced the gauge and sender three times ..but each
gives problems after a short time. These gauges are electric.
If I replace it with a mechanical gauge it works fine...there are no joins
in the connecting wires but I think I will have to replace them.
anyone have any Ideas to cure the problem..The unit I installed recently
is Electronic but it gives me the same trouble.
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Sun Apr 04, 2010 2:44 pm Post subject: Re: Oil pressure gauge |
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Those senders brand ELO gave out early, best use the VDO as replacements. The port they are screwed into is looking straight at the oil pump output, which peaks and pulses sharply at times, as reported by Jabiru in their bulletins and SBs.
So if you want to have the sender last longer screw it into the hole below the original location, this one is on the end of the oil gallery that feeds the bearings after the pressure has been slowed down approx. 10 psi by the oil cooler adaptor, the oil cooler, the oil filter.
And if your worn out sender has the idiot light connection, leave it there and wire up a light so you have a backup indication. When a sender fails the wire under the wiper breaks at the normal running portion of the gauge, and you get full scale indications while it disconnects.
Ralph
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Ralph - CH701 / 2200a |
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