VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #11  
Old 12-08-2015, 05:58 PM
RV6airplanePilot's Avatar
RV6airplanePilot RV6airplanePilot is offline
 
Join Date: May 2010
Location: Ft Laudedale FL
Posts: 180
Default Good idea

Quote:
Originally Posted by Pat Stewart View Post
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.
Good thought and not hard to check. But seems to be unlikely if your other tests were right. I would check this anyway.
__________________
Dale
ATP, dreamer and maintainer; but not a builder
RV6a N18XP 960TT (builder: Jerry Cochran)
RV6a flight experience 2100 hrs
Superior IO-360 2007
Hartzell Blended Airfoil Prop
Dual LS EI, Dual Battery
GRT HX efis & RAIM GPS, 2 axis GRT autopilot
G696, GDL39 WX, Traffic
Dynon D10
Gear Leg Stiffeners from Woodmanrog
Reply With Quote
  #12  
Old 12-08-2015, 06:07 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
Default

This thread????

http://www.vansairforce.com/communit...overnor+gasket
__________________
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."
Reply With Quote
  #13  
Old 12-09-2015, 07:13 AM
mahlon_r mahlon_r is offline
 
Join Date: Jan 2005
Posts: 1,025
Default

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
__________________
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
Reply With Quote
  #14  
Old 12-09-2015, 08:22 AM
ColoRv's Avatar
ColoRv ColoRv is offline
 
Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
Default

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.
__________________
RV-8 Flying
1,235th flying RV8
SARL Race#95
SnF Homebuilt Judge

2015 Sun n Fun Kit Built Reserve Grand Champion
2015 Oshkosh Kit Built Champion
2015 Jeffco Kit Built Grand Champion
2014 Oshkosh Outstanding Workmanship Award

Broken Warrior of the Jarhead Clan
Reply With Quote
  #15  
Old 12-09-2015, 09:19 AM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
Smile

Quote:
Originally Posted by ColoRv View Post
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.
Pulling the large oil screen in the sump might be a good first step to looking for a partial blockage...
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
  #16  
Old 12-09-2015, 11:29 AM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
Default

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.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Reply With Quote
  #17  
Old 12-09-2015, 04:03 PM
Scremm's Avatar
Scremm Scremm is offline
 
Join Date: Feb 2006
Location: Eliot, Maine
Posts: 83
Default

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.
__________________
Claudio Scremin
N221Z RV8A Maine 600+ hrs
Reply With Quote
  #18  
Old 12-09-2015, 08:44 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
Default

Quote:
Originally Posted by Scremm View Post
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.
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
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Reply With Quote
  #19  
Old 12-11-2015, 06:31 AM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
Posts: 254
Default

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.
Reply With Quote
  #20  
Old 12-11-2015, 06:39 AM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
Posts: 254
Default

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.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:15 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.