 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Bubblehead
Joined: 26 Oct 2007
Posts: 48
Location: N. Richland Hills, TX
|
 Posted: Wed May 18, 2011 4:16 am Post subject: Intake o-ring install |
 |
|
2 years ago I had to replace 4 bad cylinders on my IO 360 A1F6D. The intake tubes are the type that use o-rings to seal inside the sump. Over the last 9 months 3 of the 4 o-rings have started leaking as evidenced by rough running and high EGTs during low power ops.
When I removed and inspected the o-rings they appeared to have a dark line on the od and the id. When I rubbed the lines they turned out to be small cracks. In one area the skin of the o-ring peeled back.
I don't know if I just got bad o-rings or did not install them correctly. The Lyc overhaul manual does not say much. I used a little silicon o-ring grease on them when I installed them. Could that have contributed to their failure? Do people on this forum use anything on the o-rings during installation?
I wish I had the other style sump with the short hoses and clamps. That seems like a better system. I am thinking of finding a second hand one at a salvage shop. Any words of wisdom if I go that way? Is it worth the trouble?
| | - The Matronics LycomingEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?LycomingEngines-List |
|
_________________
John
Keller, TX
RV-8 N247TD |
|
| Back to top |
|
 |
BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
|
| Posted: Wed May 18, 2011 5:09 am Post subject: Intake o-ring install |
|
|
John:
I can not comment on the silicone grease right now. But, give me a few weeks because I am running tests at work that address the exact same question.
First thing would be the age of the 'O' rings - there should have been a shelf life on the package.
Second, 'O' rings are usually made of Neoprene, Buna-N or Viton.
All stand up very well to Gas, Diesel and Oil -AND - even Silicone.
My bet is you have a loose fit and there is vibration which is causing ware and deggeration due to the "o"ring ROLLING sideways.
The only reason to lubricate an 'O'ring is to prevent it from rolling over during install. AND the other basic rule is to lubricate with the similar materials that will be found in its operational environment.
Also check the fit area for burrs and roughness.
Barry
====================
On Wed, May 18, 2011 at 8:16 AM, Bubblehead <jdalmansr(at)gmail.com (jdalmansr(at)gmail.com)> wrote:
[quote]--> LycomingEngines-List message posted by: "Bubblehead" <jdalmansr(at)gmail.com (jdalmansr(at)gmail.com)>
2 years ago I had to replace 4 bad cylinders on my IO 360 A1F6D. The intake tubes are the type that use o-rings to seal inside the sump. Over the last 9 months 3 of the 4 o-rings have started leaking as evidenced by rough running and high EGTs during low power ops.
When I removed and inspected the o-rings they appeared to have a dark line on the od and the id. When I rubbed the lines they turned out to be small cracks. In one area the skin of the o-ring peeled back.
I don't know if I just got bad o-rings or did not install them correctly. The Lyc overhaul manual does not say much. I used a little silicon o-ring grease on them when I installed them. Could that have contributed to their failure? Do people on this forum use anything on the o-rings during installation?
I wish I had the other style sump with the short hoses and clamps. That seems like a better system. I am thinking of finding a second hand one at a salvage shop. Any words of wisdom if I go that way? Is it worth the trouble?
--------
John Dalman
Keller, TX
RV-8 N247TD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=340255#340255
===========
nes-List" target="_blank">http://www.matronics.com/Navigator?LycomingEngines-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
| | - The Matronics LycomingEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?LycomingEngines-List |
|
|
|
| Back to top |
|
|
gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
|
| Posted: Wed May 18, 2011 5:28 am Post subject: Intake o-ring install |
|
|
That other style sump is only on the parallel valve engines. I've gone the
other way - putting the angle valve sump on a parallel valve engine and it
requires modified intake tubes, i.e. neither the normal parallel or angle
intake tubes fit. I assume your swap would need modified tubes as well. The
angle valve sump is generally more desirable since the intake does not go
through hot oil. It's part of the tuned induction that gets the extra
horsepower in the angle valve engines. I did it to get the forward facing
injector. I'm not sure if there is a parallel valve equivalent. There are a
lot of those engines used without problems. I'd get new o-rings and install
dry or with something other than silicone, like fuel lube or engine oil, and
go fly.
Greg Young
--
| | - The Matronics LycomingEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?LycomingEngines-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
