[SEL] Orings

Judge Tommy Turner lcjudge at scrtc.com
Mon May 9 19:34:04 PDT 2011


Joe,  I've seen some of the swelled O Rings in the past.  I remember
accidentally dropping one once in can of lacquer thinner.  It took me a
couple of minutes to fish it out and it had swelled considerably in that
short period of time.  After a couple of hours it had swelled a LOT even
though it wasn't still in the thinner.  The thinner must have penetrated
the material in some way.

Tommy Turner
Magnolia, KY




-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of
avanti_64 at juno.com
Sent: Monday, May 09, 2011 7:25 PM
To: sel at lists.stationary-engine.com
Subject: Re: [SEL] Orings


O rings will work in both models and stationary engines. I used to sell
mechanical seals for a living and some of the guys here on the list
remember when I had the old fashioned asbestos gasket material. Well
nowadays I carry Garlock non asbestos material but that is another
subject. There are 2 basic rubber compounds that are available to you.
Buna N is the type that comes in the inexpensive commercial grade o ring
kits where you get about 200 of the different sized o rings. This
material is good to 210 degrees F. The other higher temp material is
called Viton, it will get you up to 400. O rings take the shape of the
groove they occupy and after awhile take a compression set. Basically if
you put a round o ring in a square groove it will come out square and
heat will harden it. Chemical attack makes them soft. I think a quad
ring may work better in some applications, this is found in hydraulic
cylinders and is basically a 4 sided o ring.  Do not use a material
called ethyle!  ne propylene (EP), petroleum lubricants will swell the
material and your engine won't move. Hope this helps. Joe


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