Joe Larussa Posted February 14, 2018 Report Share Posted February 14, 2018 Thoughts on fluctuations in oil pressure reading? Time to overhaul gauge or? 90F935DC-C6B1-4001-955F-FA2DDE64AF2A.MOV Quote Link to comment Share on other sites More sharing options...
DonMuncy Posted February 14, 2018 Report Share Posted February 14, 2018 If it were me, I would check and see if it does it on the ground. If so, plumb in another gauge and see if it does the same. Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 14, 2018 Author Report Share Posted February 14, 2018 Doesn't really do it on the ground of course. Quote Link to comment Share on other sites More sharing options...
KSMooniac Posted February 14, 2018 Report Share Posted February 14, 2018 It could be the ground wire...try tightening the screws around the strip gauges. One of them holds a ground wire to the back of the panel.Sent from my LG-US996 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 14, 2018 Author Report Share Posted February 14, 2018 12 minutes ago, KSMooniac said: It could be the ground wire...try tightening the screws around the strip gauges. One of them holds a ground wire to the back of the panel. Sent from my LG-US996 using Tapatalk Good idea! Quote Link to comment Share on other sites More sharing options...
KSMooniac Posted February 14, 2018 Report Share Posted February 14, 2018 Good idea! You might need a wrench on the back side...so you might need to pop the glareshield out for access. Might be worth disconnecting the ground lug and scotch-brite the back of the panel and the lug.Sent from my LG-US996 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
flyboy0681 Posted February 15, 2018 Report Share Posted February 15, 2018 Mine did the identical thing, except it swung ever so slightly more to the left, into the top of the yellow. At first I figured it was a grounding problem since we had issues only a few months before and it was the same symptoms. When I landed I checked the oil, only to find none. The tear down and ensuing overhaul were not a pleasant nor cheap experience. I would have thought that the needle would have been pegged to the left, but this is what we can expect with 35+ year old machines. 1 Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 16, 2018 Author Report Share Posted February 16, 2018 On 2/14/2018 at 5:17 PM, flyboy0681 said: Mine did the identical thing, except it swung ever so slightly more to the left, into the top of the yellow. At first I figured it was a grounding problem since we had issues only a few months before and it was the same symptoms. When I landed I checked the oil, only to find none. The tear down and ensuing overhaul were not a pleasant nor cheap experience. I would have thought that the needle would have been pegged to the left, but this is what we can expect with 35+ year old machines. Uh? Where did the oil go? Quote Link to comment Share on other sites More sharing options...
flyboy0681 Posted February 16, 2018 Report Share Posted February 16, 2018 3 minutes ago, Joe Larussa said: Uh? Where did the oil go? Teardown found a stuck exhaust value so it all burned up. There was absolutely no indication on the panel that something was amiss, oil temperature was in the normal range and she was running very smoothly even until shutdown. 1 Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 16, 2018 Author Report Share Posted February 16, 2018 1 hour ago, flyboy0681 said: Teardown found a stuck exhaust value so it all burned up. There was absolutely no indication on the panel that something was amiss, oil temperature was in the normal range and she was running very smoothly even until shutdown. How many hours did you have on the engine? Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 16, 2018 Author Report Share Posted February 16, 2018 On 2/13/2018 at 8:10 PM, KSMooniac said: It could be the ground wire...try tightening the screws around the strip gauges. One of them holds a ground wire to the back of the panel. Sent from my LG-US996 using Tapatalk Just came to mind, I have the old style gauge where a hose hooks up to the gauge. Quote Link to comment Share on other sites More sharing options...
KSMooniac Posted February 16, 2018 Report Share Posted February 16, 2018 Still worth a try as the gauge has to translate the oil pressure into a needle movement. I believe that is an electrical operation.Sent from my LG-US996 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
flyboy0681 Posted February 16, 2018 Report Share Posted February 16, 2018 34 minutes ago, Joe Larussa said: How many hours did you have on the engine? 1250 Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 17, 2018 Author Report Share Posted February 17, 2018 4 hours ago, flyboy0681 said: 1250 Ouch Quote Link to comment Share on other sites More sharing options...
Guest Posted February 17, 2018 Report Share Posted February 17, 2018 A Bourdon tube pressure gauge is purely mechanical, no electrics required other than if it has an internal light bulb. Clarence Quote Link to comment Share on other sites More sharing options...
Joe Larussa Posted February 18, 2018 Author Report Share Posted February 18, 2018 Flew three hours today. Gauge couldn't be more steady! I give up. Quote Link to comment Share on other sites More sharing options...
Guest Posted February 18, 2018 Report Share Posted February 18, 2018 You might remove and check the oil pressure relief valve. Lycoming S/I 1172C may apply. Clarence Quote Link to comment Share on other sites More sharing options...
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