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12-08-2015, 05:58 PM
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Join Date: May 2010
Location: Ft Laudedale FL
Posts: 180
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Good idea
Quote:
Originally Posted by Pat Stewart
I seem to remember an old discussion about the gasket for the prop governor and that it can be installed wrong and cause similar issues. This is just a guess and may not add any value.
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Good thought and not hard to check. But seems to be unlikely if your other tests were right. I would check this anyway.
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Dale
ATP, dreamer and maintainer; but not a builder
RV6a N18XP 960TT (builder: Jerry Cochran)
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12-08-2015, 06:07 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-09-2015, 07:13 AM
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Join Date: Jan 2005
Posts: 1,025
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If you have an internal leak in the oil pressure system, after the pump, the oil pressure should be low at idle and get improved as you increase engine and pump RPM. Your oil pressure is going down with increase in rpm with the prop governor removed and the nose bearing cavity in the crank blocked off. So to me you have eliminated all prop related issues. To me, your sequence of events doesn't suggest an internal leak. Oil pressure is going down with additional engine and pump RPM... not up. Blockage to the oil pump supply can cause good idle pressure and decreasing oil pressure as pump rpm is increased. So, my thought is there may be blockage to the oil pump. you sure a rag didn't get into the sump while doing the conversion? To me, something is causing the oil pump to have less efficiency when rpm is increased, ie inlet blockage, slipping drive etc.
Good Luck,
Mahlon
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12-09-2015, 08:22 AM
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Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
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I have worked on a lot of engines, in cars, bikes, boats and now airplanes. 9 times out of 10, when you just modified it and find something not working right....something odd happened in the change. Like Mahlon said, a rag left somewhere or a bolt that dropped and just happened to go into a supply line. Something weird that you couldn't do on purpose, but managed to happen on accident. Before you pull the engine and split the case....just be sure you haven't assumed anything. Pull it all back off and look it over.
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12-09-2015, 09:19 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by ColoRv
I have worked on a lot of engines, in cars, bikes, boats and now airplanes. 9 times out of 10, when you just modified it and find something not working right....something odd happened in the change. Like Mahlon said, a rag left somewhere or a bolt that dropped and just happened to go into a supply line. Something weird that you couldn't do on purpose, but managed to happen on accident. Before you pull the engine and split the case....just be sure you haven't assumed anything. Pull it all back off and look it over.
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Pulling the large oil screen in the sump might be a good first step to looking for a partial blockage...
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
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12-09-2015, 11:29 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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I'm with mahlon_r's theory. At your second point, I was thinking that something is blocking the oil from getting to the pump. Pull a mag and borescope and/or pull the screen and borescope.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
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12-09-2015, 04:03 PM
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Join Date: Feb 2006
Location: Eliot, Maine
Posts: 83
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Thanks for the suggestions. I'll take off an accessory or two and see what my my Chinese bore-scope may find. I did pull the oil screen in the sump to check it and it was clean as a whistle. This is definitely the time to take things slow. Especially with the cold Maine winters.
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Claudio Scremin
N221Z RV8A Maine 600+ hrs
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12-09-2015, 08:44 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by Scremm
Thanks for the suggestions. I'll take off an accessory or two and see what my my Chinese bore-scope may find. I did pull the oil screen in the sump to check it and it was clean as a whistle. This is definitely the time to take things slow. Especially with the cold Maine winters.
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This may be tough, depending upon your sump. My sump, from a D model, had a round chamber holding a cigar-like screen. There were two rectangular cutouts connecting the filter chamber to the main sump. If you can get a flashlight or small mirror in there, you may be able to see a blockage, otherwise, with that style pan, the major blockage would be in the main sump on the other side of the chamber wall, requiring sump removal for inspection.
Larry
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12-11-2015, 06:31 AM
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Join Date: Sep 2014
Location: IN
Posts: 254
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With a bore scope, I have had some luck going in through the oil filler tube to have a look inside of the engine case.
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12-11-2015, 06:39 AM
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Join Date: Sep 2014
Location: IN
Posts: 254
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Talk to a prop shop! Tell them what you did and ask them if they have ever seen this occur, they have likely had this or a similar occurrence and have a good idea where to look. If they have been in business for a long time and you get the guy who has been there for 30 years he can say yes or no to each probable prop / governor individual issue.
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