Today's Message Index:
----------------------
1. 01:59 PM - Re: oil Pressure (Dan Wilde)
2. 04:06 PM - Re: oil Pressure (Roger Lee)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: oil Pressure |
On 9/1/2011 2:26 PM, AJR wrote:
> On my 912 ULS engine the oil pressure is about 42 psi when engine is
> warmed up
> or in cruise..When the engine is started from cold the pressure is 80
> PSI....Is this
> normal performance for the rotax 912 ULS in a Zenair ch-701
> Alvin Rose
> *
>
> *
Mine does the same thing.
Dan Wilde
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: oil Pressure |
I was out cruising with a friend when he had an in flight problem on a 2 mile approach.
He heard what might have been a metal to metal squeal and his oil pressure
dropped to 15 psi and started to bounce between 20-35 psi. I ask if there
were any other gauges that were out of line and did his engine change in any
way (i.e. noise or rpm)? The answer was no to both. Landed without any issues.
I told him that 98% of the time it is a bad sender when it acts this way. If
the pressure goes real high (100 psi) then it is usually a ground. If it fluctuates
all over it is a bad sender or bad wire connection. If it just drops way
down low it is usually the sender. So the next morning we took a look at the
engine. I told him we needed to make a diagnosis based on some facts and not
just hunt and peck around. It was time to break out the oil pressure test setup
that cost about $20 to make. It all comes from any hardware store. Here are
some pictures and a video to look at. I apologize up front for the poor video
quality as it was a spur of the moment thought. I'll do it again one day for a
better quality sequel. It is just 1/8" copper tubbing, a brass tee, 4 x 1/8 NPT-27
thread compression fittings and a 100 psi gauge. Pull the oil pressure sender
out. Screw in a brass fitting and run it out about 18" and place the tee
in line. then run the rest of the tubing and gauge into the cockpit. Screw the
oil pressure sender in the top of the tee and connect the oil pressure sending
wire. The gauge will be grounded through the copper tube. Start the engine,
loosen the fitting by the gauge and let a few drops of oil come out to purge
any air. Now you can compare the engine's actual oil pressure to the instrument
panel reading.
http://www.youtube.com/watch?v=5hgVR4pJU6s
p.s.the metal to metal squeal was actually the low oil pressure alarm. The problem
was just a bad oil pressure sender.
--------
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=351288#351288
Attachments:
http://forums.matronics.com//files/oil_test_fitting_in_oil_pressure_sending_port_387.jpg
http://forums.matronics.com//files/oil_test_fitting_in_oil_pressure_port_1__134.jpg
http://forums.matronics.com//files/oil_pressure_test_tee_fitting_with_sender_190.jpg
http://forums.matronics.com//files/oil_pressure_test_setup_193.jpg
http://forums.matronics.com//files/oil_pressure_test_gauge_268.jpg
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|