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1. 02:05 AM - Re: [jabiruengines] Puzzeling oil pressure (James, Clive R)
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| Subject: | RE: [jabiruengines] Puzzeling oil pressure |
This is the same phenomena that I experienced with my 3300. Increasing
RPM was giving decreasing pressure. More extreme than mentioned below
however.
I changed the oil and filter and tried two new senders (nothing wrong
with them, wiring etc proven from exhaustive testing)
I took the cooler off and read the pressure off the oil gallery and
ended up with zero oil pressure on final after it dropping from 3 bar on
climb out.
Lots more tests on ground and no reading at all unless I used a
mechanical pressure gauge.
Changed oil + filter again (lower viscosity), nothing, then replaced
cooler into circuit and got a ground run that looked normal.
I have two oil pressure sender/panel meters now fitted, one standard VDO
in the normal pump discharge position and one Equus in the engine
gallery position.
The VDO one was the one that it was suggested was faulty when I posted
the original problem, nothing has been changed with it and it's reading
now.
Ground runs then looked 'normal' on both readings.
Flew a few days ago and below is what I have recorded:
RPM VDO EQUUS TEMP
1000 3.3 2.0 cold
1400 4.4 3.0 60
700 2.9 2.0 65
1500 4.1 2.8 75
700 1.9 1.3 78
1400 4.4 3.0 60
700 3.2 2.4 60
1200 4.1 3.0 55
2700 3.7 2.0 80
Flew again yesterday for an air test for handling checks and the
readings still look 'normal'.
Got oil temp up to 105 still no problems, 2 bar + on Equus meter.
I have some pressure with regard to the aircraft permit so don't want to
start 'messing about' with the engine again.
I will however when I have the time as it makes no sense what I saw
through the period when I had the thicker oil in the engine.
Regards, Clive
________________________________
From: jabiruengines@yahoogroups.com
[mailto:jabiruengines@yahoogroups.com] On Behalf Of Barbara Davies
Sent: 06 November 2010 08:32
Subject: Re: [jabiruengines] Puzzeling oil pressure
I seem to recollect something similar recently being put down as
Cavitation of the oil at certain engine RPM, but cannot recollect the
thread or date,
Cheers,
B,
kai_lyche wrote:
>
> Lynn, thanks for your input. I have another nice one: oil pressure is
> fine- oil level at min. or max. marks on the dipstick, cold engine,
> hot engine, fast idle, partload, cruise (2700-2900)and WOT (3250) oil
> pressure is fairly steady at 45-50psi. But at almost exactly 3000 rpm
> on the tach the oil pressure drops below 30 psi. At first I suspected
> the sender and replaced it. No change. Then I put in another gage;
> still the same. Then I suspected some kind of problem because of
> voltage drop, but the generastor is charging fairly steadily at 14,1
> to 14.3 Volts when the engine is above 1600. So I took off the oil
> filter and dismanteled the relief valve. Both seat and piston were
> worn (300 hours of operation). Got them refaced and put the thing back
> together. Still the same: at 3000 rpm the oil pressure goes down.
WHY??
>
>
> ----------------------------------------------------------
>
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