Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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 Posted: Tue Oct 05, 2010 10:37 am Post subject: [jabiruaircraft] Re: 3300 pressure sensing problem-HELP-UPDA |
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Lol, not that good, it's not a wiring issue. I have proven that several
ways, it was also wired by me so why would there be an issue....
Well today didn't go well as the new sender and meter arrived very late,
after I fitted it it read -7 psi static (a low zero).
Then when I tried to start the engine for a ground run the battery was
still flat. The charger I borrow had a high/low switch and apparently I
should have set it on high.
I'm at the airport now flying off for 2 weeks work so all stop and I'll
not be able to more forward until I get back.
Thanks for the suggestions.
Regards, Clive
________________________________
From: jabiruaircraft(at)yahoogroups.com
[mailto:jabiruaircraft(at)yahoogroups.com] On Behalf Of A
Sent: 05 October 2010 12:48
To: jabiruaircraft(at)yahoogroups.com
Subject: [jabiruaircraft] Re: 3300 pressure sensing problem-HELP-UPDATE
Isnt PTFE a good insulator? are the threads the earth?
Enrico
--- In jabiruaircraft(at)yahoogroups.com
<mailto:jabiruaircraft%40yahoogroups.com> , "James, Clive R"
<clive.james(at)...> wrote:
| Quote: |
Hi Norm, thanks for mulling it over for me
'So you have proven that your senders, wiring and the gauge on the
panel
|
| Quote: | are working - but only when the sender is out of the engine'
I also had a sender on the engine wired up with the top off the sender
so I could manipulate the wiper, that worked fine, also ran the engine
with it jammed at a 2 bar reading, stayed solid reading on my panel.
Roger suggested pressuring up the oil galleries with air to see what
the
|
| Quote: | relief valve pops at and also should get a reading on the senders, I
haven't had an opportunity to do that but will at some point.
BTW I screw them in with PTFE, carefully so none goes into the engine.
Anyhow I have an update, I was musing the dynamics and what had
changed:
|
| Quote: | So I changed the oil to pure 80 and fitted a new filter
Cranking with plugs out, nothing on galleries, nothing on pump output
So I refitted the oil cooler into circuit and primed and topped up
Nothing on galleries but a 'normal' reading on the pump output
'normal'
|
| Quote: | position. 4 bar.
Yesterday I pulled the plane out and ground ran it, 3.7 bar warming to
4
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| Quote: | bar. 200' cloud base stopped me flying it though.
I sit in the house waiting for a 'Tim' sender and panel meter to be
delivered 'guaranteed next day' The plane is wired and the panel has a
new 52mm hole waiting for this. I plan to run this alongside the VDO
set
|
| Quote: | up. 'Tim' on the engine galleries and VDO on the normal pump output
position.
We will see.....I hope something....
Regards, Clive
Re:Oil pressure sensing problem.....3300 HELP
Here's something which jumps out at me Clive:
"I fitted a standard mechanical gauge and read ~ 4 bar on the
galleries
|
| Quote: | and
on the normal pump output sensing positions."
So you have proven that the engine is in fact pumping oil.
"I checked the senders with an air supply and test gauge and got
reasonable
readings on the panel meter but back in the engine cranking with plugs
out
nothing."
So you have proven that your senders, wiring and the gauge on the
panel
|
| Quote: | are
working - but only when the sender is out of the engine.
The only thing left is in how you are installing the pressure sender
into
the engine. Are you using anything on the threads of the sensors, such
as
thread sealing paste or, hopefully not but I have seen it used on fuel
fittings, thread sealing plumbers Teflon tape? I'm guessing no to
both,
|
| Quote: | but
it's worth asking.
Failing that, can you do a simple "earth jump" test from maybe the
sender
thread or the case of the sender? - a short wire to some extra earth
place
nearby on the engine.
Norm
In OZ.
|
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