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ajroseca(at)nf.sympatico.
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 Posted: Thu Sep 01, 2011 1:29 pm Post subject: oil Pressure |
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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
[quote][b]
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Thu Sep 01, 2011 1:44 pm Post subject: oil Pressure |
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YES...
Cold Oil high pressure
Normal Oil - Normal pressure
Hot Oil - Low pressure
Barry
DTS
On Thu, Sep 1, 2011 at 5:26 PM, AJR <ajroseca(at)nf.sympatico.ca (ajroseca(at)nf.sympatico.ca)> wrote:
[quote] 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
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ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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litesellme(at)yahoo.com
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| Posted: Thu Sep 01, 2011 2:38 pm Post subject: oil Pressure |
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The spring on your oil pump check valve is bad. It pops open to maintain a oil pressure less than the max rated.
Connected by MOTOBLUR™ on T-Mobile
-----Original message-----
[quote]From: AJR <ajroseca(at)nf.sympatico.ca>
To: rotaxengines-list(at)matronics.com
Sent: Thu, Sep 1, 2011 14:37:12 PDT
Subject: RotaxEngines-List: oil Pressure
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
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Sep 01, 2011 7:37 pm Post subject: Re: oil Pressure |
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Yes it can be normal and your readings may be off some too. The high at first cool start is normal and lower readings are normal after a full warm up. The only way to do a good job in verifying your oil pressure is to put a mechanical gauge in line a see what it says. You can install the new oil pressure regulator cone, spring and plug screw and that may reduce the gap between cold and hot.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Dan Wilde
Joined: 05 Jun 2011
Posts: 34
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| Posted: Fri Sep 02, 2011 12:59 pm Post subject: oil Pressure |
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On 9/1/2011 2:26 PM, AJR wrote: | Quote: | 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
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Mine does the same thing.
Dan Wilde
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri Sep 02, 2011 3:03 pm Post subject: Re: oil Pressure |
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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.
Video attached.
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.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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