VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #11  
Old 09-27-2011, 05:45 AM
RV10inOz's Avatar
RV10inOz RV10inOz is offline
 
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
Default

Yes I think so.

But thats how they come from the factory!
Reply With Quote
  #12  
Old 09-27-2011, 06:02 AM
Wayne Gillispie Wayne Gillispie is offline
 
Join Date: Apr 2009
Location: USA
Posts: 1,499
Default Flanges are not flat.

My new IO-540 has slight gaps in the center. Now, after seeing the cause, mine are coming off before first flight to get the flange surface sanded flat then I will reassemble with hylomar.

When we prime our fuel injected engines, the fuel pours right down the tube. The reason for deterioration is from having the gap which allows fuel in and movement during pressure pulses. Hylomar or equivalent should get you three times the hours. Paying as much as we do for these engines, one would expect better fit and gaskets. We don't want any leaks on intake as it is unfiltered/heated air which throws off fuel servo fuel delivery ratios.

For those flying to check for leaks install small shop vac exhaust to fab inlet with filter in place to slightly pressurize intake tubes and use soap bubbles to check for leaks.

Edit: I can fit a .010" feeler gage on every intake tube flange between two bolts.
__________________
Good judgment comes from experience, and a lot of that comes from bad judgment.

Last edited by Wayne Gillispie : 09-27-2011 at 06:06 AM.
Reply With Quote
  #13  
Old 09-27-2011, 06:19 AM
RV10inOz's Avatar
RV10inOz RV10inOz is offline
 
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
Default

Quote:
Edit: I can fit a .010" feeler gage on every intake tube flange between two bolts.
On a brand new un run engine??????

Its lucky we get 250 hours then!

Do tell more folks.

I have lodged a defect report with CASA which eventually makes its way to the FAA if there is merit....I will link this thread to them if there is enough eveidence.

This sucks........well it doesn't suck as much as it should I suppose
Reply With Quote
  #14  
Old 09-27-2011, 06:34 AM
Wayne Gillispie Wayne Gillispie is offline
 
Join Date: Apr 2009
Location: USA
Posts: 1,499
Default

Just the standard factory test cell run approx 1 hr.

This is not caused by heating of the cast flange. On jet engines, helicopters, automobiles mating surfaces must be parallel and flat to get a good seal. They have to be cast or machined that way. I have mated many 24" X 18" accy gearbox cases with nothing but hylomar. One leak in 4 yrs. Sent it in for machining to level/flatten surface.

I don't have time to pull them right now but will before first engine start.
__________________
Good judgment comes from experience, and a lot of that comes from bad judgment.
Reply With Quote
  #15  
Old 09-27-2011, 02:03 PM
HROCKLEN HROCKLEN is offline
 
Join Date: May 2007
Location: woodbridge ct.
Posts: 4
Default Intake gasket leak

I have a RV6 with a o320 that had the same problem.I found that the intake flanges were bent .The cure for me was to machine both the surface where the pipe flange seats & the outside surface of the flange.Its been about 400 hrs since then with no new problems.
Reply With Quote
  #16  
Old 09-27-2011, 07:45 PM
RV10inOz's Avatar
RV10inOz RV10inOz is offline
 
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
Default

Seems this is not unusual, the machining of the flange clamp I can see as possible, the heads would need to come off to do them and the thin flange on the pipe is too thin to machine.

Some super Goo may be the next treatment. Hylomar may be the answer. It just should not have to be.
Reply With Quote
  #17  
Old 09-27-2011, 09:26 PM
Wayne Gillispie Wayne Gillispie is offline
 
Join Date: Apr 2009
Location: USA
Posts: 1,499
Default

If it makes you feel any better, I removed two bolts and lowered one flange, attempted to pull gasket loose...it fell apart. Yes, brand new engine. I have purchased better gaskets than those for my truck. I'll fix it this winter after test flights and some family trips. I can see plane maintenance and repair time staying right there with the hobbs meter. Oh but just think of all the beautiful sights from above. Think positive Wayne!
__________________
Good judgment comes from experience, and a lot of that comes from bad judgment.
Reply With Quote
  #18  
Old 08-06-2014, 04:05 AM
Kevin Horton's Avatar
Kevin Horton Kevin Horton is offline
 
Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
Default

Quote:
Originally Posted by Mcminn View Post
I used these High Temperature compliant gaskets made from Flurosilicon rubber.
Where did you purchase these gaskets?
__________________
Kevin Horton
RV-8
Moses Lake, WA, USA
http://www.kilohotel.com/rv8/
Reply With Quote
  #19  
Old 08-06-2014, 07:17 AM
Neal@F14's Avatar
Neal@F14 Neal@F14 is offline
 
Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
Default

Interested also...

I had to change my Lyc paper gaskets at 400 hours and would like to try something better next time since my engine is carbureted and leaks in these gaskets can cause worse lean mixture probs than on an injected engine.
__________________
Neal Howard
Airplaneless once again...
Reply With Quote
  #20  
Old 08-07-2014, 04:45 PM
BD4Guy BD4Guy is offline
 
Join Date: Sep 2007
Location: Los Angeles CA
Posts: 25
Default

I'm interested too.
__________________
Donated 2013.
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 06:35 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.