Author Topic: oil pressure drop  (Read 556 times)

Chris Canty

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oil pressure drop
« on: September 06, 2012, 11:23:36 AM »
Experiencing oil pressure drop, once the engine and oil is warmed up in flight. Recreated this problem on the ground, running engine 2000 rpm, 15 minutes.Mechanic stated that we were at the minimum so everything was ok. Mechanic now thinks,lower end bearing problem and thinks the engine needs to come out. I0-470

Donald Lawrenz

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Re: oil pressure drop
« Reply #1 on: September 07, 2012, 09:29:00 AM »
I am a bit unclear as to the problem you are asking about. Is it that you have noticed that the oil pressure in flight, after the oil has thoroughly warmed, is now lower than previously experienced? If that is what you are seeing the problem may also be trash under the oil pressure relief valve seat preventing it from fully closing to maintain pressure.

Now, that trash could be indicating something serious, such as cam spalling or some other part throwing off metal, so the end result, pulling the engine, might be the same. Never-the-less you might want to pull the valve, clean and inspect the seat, and also closely examine the filer (if you have one) for metal particles. If you only have a screen pull it also because, while not as good as a filter, it will also occasionally stop bigger pieces of metal. If you don't find anything under the seat, don't be surprised if the pressure is restored on the next flight. Sometimes those little pieces causing the mischief drop off or out of the way when the relief is pulled and you never notice them.

Chris Canty

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Re: oil pressure drop
« Reply #2 on: September 07, 2012, 01:03:18 PM »
All of that has been done. No trash visible anywhere. None in the oil filter

Lewis Gage

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Re: oil pressure drop
« Reply #3 on: September 07, 2012, 01:57:51 PM »
Running an engine on the ground for 15 minutes at 2000 RPM is not a good idea. Also, the oil pressure will/may drop when it is hot. So long as it is in the green in flight and you have found no damage via the inspections of the oil filter there is PROBABLY nothing wrong with the engine. Just fly with your fingers crossed and relax.

Regards,  Lew Gage

Donald Lawrenz

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Re: oil pressure drop
« Reply #4 on: September 08, 2012, 07:21:48 AM »
Chris

Could you please answer the first question posed?

Lewis Gage

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Re: oil pressure drop
« Reply #5 on: September 09, 2012, 10:13:30 AM »
Has the pressure gauge been checked? Either electric or mechanical gauges will or may become out of calibration after many years of service. Be sure to tap the check gauge into the same line the original gauge reads from as the pressures will vary at different places around the engine.

Regards,  Lew Gage