tag:blogger.com,1999:blog-26736972.post5795368781464143499..comments2024-03-24T23:38:41.972-07:00Comments on mechanicsupport.com: Lycoming Fluctuating Oil PressureAnonymoushttp://www.blogger.com/profile/15377633185895928429noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-26736972.post-80148099440798244992015-06-19T10:58:09.570-07:002015-06-19T10:58:09.570-07:00I am having similar issues on 2 O-360s. Aircraft s...I am having similar issues on 2 O-360s. Aircraft sat idle for a few years, ran ok for about 10 hours, and now we see the temp hits 220 degrees, oil pressure drops and the propellers go into feather position. Checking the vermotherm, sent out the oil coolers which were not hot at all, and if the vermotherm and oil coolers check out ok, then what? Maybe prop governors? CFI Academyhttp://cfiacademy.comnoreply@blogger.comtag:blogger.com,1999:blog-26736972.post-47214442205647104962014-08-26T06:17:12.564-07:002014-08-26T06:17:12.564-07:00Was there a solution to this problem? could it be...Was there a solution to this problem? could it be the oil suction screen (in the sump) being clogged? This screen should be inspected every oil change, or at least on every annual. Jackhttps://www.blogger.com/profile/00854044001163982553noreply@blogger.comtag:blogger.com,1999:blog-26736972.post-13774237786275263922012-08-16T12:10:10.487-07:002012-08-16T12:10:10.487-07:00I have been having the same problem for last sever...I have been having the same problem for last several years. O320E2C fixed pitch in an RV-6. Oil pressure is high at start up, then after it reaches 100 deg I can do a run up with out redlining oil pressure. After in flight and 180+ deg the pressure drops to mid 60's. When I pull the power back to below 1400 RPM's the pressure jumps up to mid 80's. Any thing above 1400 RPM's and it drops instantly to mid 60's. Oil analysis has been good so should I be concerned?Anonymoushttps://www.blogger.com/profile/12404997883303009920noreply@blogger.comtag:blogger.com,1999:blog-26736972.post-21526148446015626062011-10-05T11:02:31.209-07:002011-10-05T11:02:31.209-07:00I have the same problem on my o235-c1. I just com...I have the same problem on my o235-c1. I just completed a top overhaul and the pressure is good until I get to curise. It gradually decreases down to 60 psi and will come back and recover at 75psi. Its not consistent. Did you guys figure this issue out??Ryannoreply@blogger.comtag:blogger.com,1999:blog-26736972.post-32391817202589139392010-10-23T20:06:57.866-07:002010-10-23T20:06:57.866-07:00I'm having exact symptoms with Grumman Yankee ...I'm having exact symptoms with Grumman Yankee with Lycoming O-290-D2 with fixed pitch prop. Good pressure on start, run up, takeoff. After 5 minutes flying (oil temp reaches 185F) oil pressure drops to 60. When I reduce throttle for approach pressure returns to 75. Basically Oil P=60 for RPM>2000, Oil P=75 for 1500<RPM<2000. Temperatur constant ~185F. <br />Owned this airplane for 10 years and just started seeing this recently 25 hours after overhaul.<br />Helpful suggestions most welcome.terrierdahttps://www.blogger.com/profile/02865011329996826431noreply@blogger.comtag:blogger.com,1999:blog-26736972.post-49924241029920367482010-06-18T16:09:48.244-07:002010-06-18T16:09:48.244-07:00Good idea - I will pass it on.Good idea - I will pass it on.Anonymoushttps://www.blogger.com/profile/15377633185895928429noreply@blogger.comtag:blogger.com,1999:blog-26736972.post-23629158228092480512010-06-18T15:59:28.395-07:002010-06-18T15:59:28.395-07:00Could this problem be in the governor? It is menti...Could this problem be in the governor? It is mentioned that the pressure drops during cruse and rebounds on landing. The governor sends oil pressure to the propeller to increase pitch for cruse. If there is a problem in this section could excessive oil flowing back to the sump resulting in the observed pressure drop?ke4pcxhttps://www.blogger.com/profile/01149980119443929047noreply@blogger.com