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n616tb(at)btsapps.com
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 Posted: Sun Sep 24, 2006 7:06 pm Post subject: Vision Microsystems NOT - oil pressure problem |
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Ok, I have exhausted all my avenues with the gauge and find this.
The wires at the sender test just fine as per VMI voltage test procedure
The fuel pressure was working just fine, so I swapped the two senders. The fuel pressure continues to work and the oil does not.
Now I have to ask myself. Does this engine produce oil pressure? Thank God I have not run it for more than a minute.
Question: How can I confirm if I even have oil pressure? Is it possible the engine oil system has an air bubble? How do I burp it?
My engine is an 0-360-A1A and is from Aero Sport
Thanks for all the input. No oil pressure reading means no flying.
Oh, will the DAR expect me to fire the engine to confirm the gauges work?
Tim
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Vanremog(at)aol.com
Sent: Sunday, September 24, 2006 7:38 PM
To: rv-list(at)matronics.com
Subject: Re: Vision Microsystems - oil pressure problem
In a message dated 9/24/2006 1:34:59 P.M. Pacific Daylight Time, chasb(at)satx.rr.com writes:
| Quote: |
If you have the VM-1000 Installation/User Manual, Section 5 is a
Trouble Shooting Guide. Page 88 give specific readings to check out
the oil pressure indicating system. If you don't have the manual,
contact me back channel and I'll send you a copy of the appropriate
page. |
===============
My experience may give you pause to consider what can happen in an intermittent piece of cable. This it the only explanation I was able to come up with my fuel pressure (carbureted) sender indications from day one until I changed the cable (remade it with all new materials).
From the first flights until about 6 months ago I had variations in my pressure indications that ran the gamut from zero to 9 psi at various times and then would settle down for months only to recur at odd times. I discussed with VMI and they told me that there is no way the sender or the conditioning and/or display driver circuits in the DPU could behave this way. Before my last trip to Sedona I finally gave up, rebuilt it and spent an hour on my back under the panel stripping out the old one and reconnecting the new one.
It has been working well ever since.
What I believe happens is that the cable VMI buys is the wonderfully high quality (he said facetiously) stuff that comes from overseas. It is constructed of individual primaries that get shielded and jacketed as a grouping. I suspect that when the cable making machine senses that one of the individual wires has reached the end of the spool, it stops and notifies the operator to manually load a new spool. The operator (making the equivalent of 5 cents a day) strips back some insulation on the free ends and twists them together. He hits go and the machine continues making more high quality cable and no one is the wiser.
The shipping guy tests the spool (if they test at all) and there is continuity on all wires. We're good to go off to the USA and fly in the instrumentation circuit of an aircraft.
Imagine an only slightly less motivated operator that doesn't strip the wires and a manufacturer that laid off the test function to cut costs. Good wire and cable is worth the money.
GV (RV-6A N1GV O-360-A1A, C/S, Flying 809hrs, Silicon Valley, CA)
01234567890123
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Vanremog(at)aol.com
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| Posted: Sun Sep 24, 2006 7:23 pm Post subject: Vision Microsystems NOT - oil pressure problem |
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In a message dated 9/24/2006 8:08:26 P.M. Pacific Daylight Time, n616tb(at)btsapps.com writes:
| Quote: | | Question: How can I confirm if I even have oil pressure? Is it possible the engine oil system has an air bubble? How do I burp it? |
===========================
Disconnect the lead to the starter to ensure that you don't get confused and get hit with a spinning prop.
Disconnect the ignition wires from the spark plugs and lay them aside. Remove all of the spark plugs.
Rotate the engine using the prop until you either get tired or you get a pressure indication.
GV (RV-6A N1GV O-360-A1A, C/S, Flying 809hrs, Silicon Valley, CA)
[quote][b]
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jsflyrv(at)verizon.net
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| Posted: Sun Sep 24, 2006 8:45 pm Post subject: Vision Microsystems NOT - oil pressure problem |
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Vanremog(at)aol.com wrote:
| Quote: | In a message dated 9/24/2006 8:08:26 P.M. Pacific Daylight Time,
n616tb(at)btsapps.com writes:
Question: How can I confirm if I even have oil pressure? Is it
possible the engine oil system has an air bubble? How do I burp it?
===========================
Disconnect the lead to the starter to ensure that you don't get confused
and get hit with a spinning prop.
Disconnect the ignition wires from the spark plugs and lay them aside.
Remove all of the spark plugs.
Rotate the engine using the prop until you either get tired or you get a
pressure indication.
GV (RV-6A N1GV O-360-A1A, C/S, Flying 809hrs, Silicon Valley, CA)
|
Or install a temp manual oil pressure, start engine and see if you have
oil pressure in the first 30 sec. my guess is that you do.
Jerry
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Doug Gray
Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia
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| Posted: Mon Sep 25, 2006 1:19 am Post subject: Vision Microsystems NOT - oil pressure problem |
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First off, physically remove the sender and confirm oil is at least
getting to it. You could check the sender with air pressure at the same
time.
Do you have a flow restrictor in the oil sensor line - is it drilled
correctly?
Doug Gray
On Sun, 2006-09-24 at 23:22 -0400, Vanremog(at)aol.com wrote:
| Quote: | In a message dated 9/24/2006 8:08:26 P.M. Pacific Daylight Time,
n616tb(at)btsapps.com writes:
Question: How can I confirm if I even have oil pressure? Is
it possible the engine oil system has an air bubble? How do I
burp it?
===========================
Disconnect the lead to the starter to ensure that you don't get
confused and get hit with a spinning prop.
Disconnect the ignition wires from the spark plugs and lay them aside.
Remove all of the spark plugs.
Rotate the engine using the prop until you either get tired or you get
a pressure indication.
GV (RV-6A N1GV O-360-A1A, C/S, Flying 809hrs, Silicon Valley, CA)
|
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n616tb(at)btsapps.com
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| Posted: Mon Sep 25, 2006 6:24 am Post subject: Vision Microsystems NOT - oil pressure problem |
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Well this creates a good question. The line from the engine to the sender
is about 24" long and is a dead end. If air is trapped in the line are you
suggesting it would not read a pressure? I would think the air would
pressurize the sender as well. I could bleed it if you think it would
matter. Assuming the engine is making pressure.
Tim
[quote] --
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Doug Gray
Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia
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| Posted: Mon Sep 25, 2006 1:52 pm Post subject: Vision Microsystems NOT - oil pressure problem |
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I'm not suggesting trapped air is the problem. As you rightly point out
it is not an issue.
I am suggesting that in the first instance you check that oil or should
I say oil pressure IS getting to the transducer.
Is the line blocked (perhaps by an undrilled flow restrictor), connected
to the wrong engine port etc? I would expect that if you remove the
sender itself oil should flow freely from the line when the prop is
turned through.
Simple test, something I would try.
Doug Gray
On Mon, 2006-09-25 at 07:22 -0700, Tim Bryan wrote:
[quote]
Well this creates a good question. The line from the engine to the sender
is about 24" long and is a dead end. If air is trapped in the line are you
suggesting it would not read a pressure? I would think the air would
pressurize the sender as well. I could bleed it if you think it would
matter. Assuming the engine is making pressure.
Tim
> --
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n616tb(at)btsapps.com
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| Posted: Mon Sep 25, 2006 3:35 pm Post subject: Vision Microsystems NOT - oil pressure problem |
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Thanks Doug,
Today I disconnected the transducer and screwed on a mechanical gauge. I do
have engine oil pressure, so back to figuring out the gauge/ transducer
issue.
Thanks again
Tim
[quote] --
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