Today's Message Index:
----------------------
1. 07:39 AM - Re: Oil Pressure on Rotax 912UL (Roger Lee)
2. 10:36 AM - Re: Re: Oil Pressure on Rotax 912UL (Damien Graham)
3. 10:37 AM - Re: Oil Pressure on Rotax 912UL (Damien Graham)
4. 10:48 AM - Re: Oil Pressure on Rotax 912UL (FLYaDIVE)
Message 1
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| Subject: | Re: Oil Pressure on Rotax 912UL |
You need a gauge to go up to at least 100 psi. The max oil pressure can be up to
72 psi.
If the oil pressure sender has something on the threads it won't ground properly.
Make sure all your grounds are tight because this will cause this type of issue.
Senders are more often at fault than the gauge itself by a long shot.
Before you do anything put a mechanical gauge on the oil system to check the real
pressure. This can be done down at the sender. Usually the port right in front
of the oil pressure sender can be used. It is only plugged off with a screw.
It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace Hardware.
If you have the old style oil pressure regulator ball-bearing this migh
be adding to your problems. Even if you don't get the extended TBO it is worth
spending the $75 and ten minutes to install it.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=428603#428603
Message 2
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| Subject: | Re: Oil Pressure on Rotax 912UL |
Thanks Roger. I always appreciate your advice.
Regards,
Damien
On Aug 17, 2014, at 10:39 AM, Roger Lee <ssadiver1@yahoo.com> wrote:
>
> You need a gauge to go up to at least 100 psi. The max oil pressure can be up
to 72 psi.
> If the oil pressure sender has something on the threads it won't ground properly.
Make sure all your grounds are tight because this will cause this type of
issue. Senders are more often at fault than the gauge itself by a long shot.
> Before you do anything put a mechanical gauge on the oil system to check the
real pressure. This can be done down at the sender. Usually the port right in
front of the oil pressure sender can be used. It is only plugged off with a screw.
It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace
Hardware. If you have the old style oil pressure regulator ball-bearing this
migh be adding to your problems. Even if you don't get the extended TBO it is
worth spending the $75 and ten minutes to install it.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center - Heavy Maint. Rated
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=428603#428603
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Oil Pressure on Rotax 912UL |
Thanks Craig. I found the 10 bar stamp on the original sender. I will
order the correct replacement. Thanks again.
Regards,
Damien
On Aug 16, 2014, at 8:27 PM, Craig Payne <craig@craigandjean.com> wrote:
> I think "bar 5" or "bar 10" is stamped on the side of the sensor's hex
nut.
>
> -- Craig
>
>
> On Sat, Aug 16, 2014 at 5:07 PM, Damien Graham <dgraham7@twcny.rr.com>
wrote:
<dgraham7@twcny.rr.com>
>
> Thanks very much.
> Regards,
> Damien
>
> Sent from my iPad
>
> > On Aug 16, 2014, at 7:02 PM, Alan Sandul <asandul@yahoo.com> wrote:
> >
<asandul@yahoo.com>
> >
> > Had the same problem and I had ordered the 5 bar sender and not 10
bar sender. They will exchange if that is the problem.
> >
> > Sent from my iPhone
> >
> >> On Aug 16, 2014, at 5:22 PM, Damien Graham <dgraham7@TWCNY.RR.COM>
wrote:
> >>
<dgraham7@twcny.rr.com>
> >>
> >> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered
up for a flight last week the VDO oil pressure gauge was reading high
off the scale. I pulled the cowling and found that the wire had come
loose from the sender. A non-aviation mechanic friend and I managed to
damage the sender so I order a new VDO sender from Aircraft Spruce.
> >> My IA was helping me with some upgrades on my Zodiac and he
replaced the sender today. When I powered up today the oil pressure
gauge was still reading high, 135, but it was not off the scale. I shut
down and powered up again and it read 120.
> >> We are wondering if the VDO oil pressure gauge was affected by the
earlier off scale readings when the wire was broken. If so, will the
gauge come back to normal readings or should I buy a new VDO oil
pressure gauge and see if that fixes the problem? Thanks.
> >> Regards,
> >> Damien Grtaham
> >> N48TK
> >
> >
> >
> >
> >
>
>
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Message 4
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| Subject: | Re: Oil Pressure on Rotax 912UL |
NOT LIKELY!
Since your VDO sending unit is ELECTRIC and since the sending unit has ONLY
a low voltage and high voltage limit - Even it the real pressure increased
to 500 PSI the output of the sending unit STILL would be ONLY the max
allowed by the unit. Ergo, it would NOT damage the indicator gauge.
NOW! What you and the group should do is take Voltage reading Vs Pressure
indications. Post those readings to the group and PLOT the resultants...
Voltage Vs Pressure. Now, knowing those values you should be able to say:
X Voltage (Low End) = X Pressure, Y Voltage (Middle) = Y Pressure, Z
Voltage (High End) = Z Pressure and this would be Max Pressure readable by
the gauge.
Crazy question: Is there a manual for the unit which gives a check value?
I also noticed there are a few different sending units... Which unit do
you have? Which did you replace it with? Here is a unit that reads from a
Low of 11.4 PSI to a high of 150 PSI.
NOW! This unit even give a resistance value of 0 to 180 Ohms. You can
either read the output voltage across the sending unit or remove the wires
and read the resistance.
But, the question is WHY is the pressure dropping each time? COLD oil will
cause high oil pressures and as the oil temp increases the pressure will
drop.
Is that what you are seeing?
Barry
On Sat, Aug 16, 2014 at 5:22 PM, Damien Graham <dgraham7@twcny.rr.com>
wrote:
> dgraham7@twcny.rr.com>
>
> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for
> a flight last week the VDO oil pressure gauge was reading high off the
> scale. I pulled the cowling and found that the wire had come loose from the
> sender. A non-aviation mechanic friend and I managed to damage the sender
> so I order a new VDO sender from Aircraft Spruce.
> My IA was helping me with some upgrades on my Zodiac and he replaced the
> sender today. When I powered up today the oil pressure gauge was still
> reading high, 135, but it was not off the scale. I shut down and powered up
> again and it read 120.
> We are wondering if the VDO oil pressure gauge was affected by the earlier
> off scale readings when the wire was broken. If so, will the gauge come
> back to normal readings or should I buy a new VDO oil pressure gauge and
> see if that fixes the problem? Thanks.
> Regards,
> Damien Grtaham
> N48TK
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