Re: O-Ring Sealants - Saab 9-5 Bulletin Board - Saabnet.com
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Re: O-Ring Sealants
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Posted by Mark in Marine (MN) (more from Mark in Marine (MN)) on Wed, 20 Jul 2011 17:06:00 Share Post by Email
In Reply to: O-Ring Sealants, Robp, Wed, 20 Jul 2011 16:00:35
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Sorry to hear about your leak. I did this job recently, and I agree that it's not very fun!

Addressing your question about sealants: they might work okay, but I would go with something more like the Hylomar HPF. The best seal will be an o-ring the right size, well-lubricated (HPF), with very clean joint (remove all corrosion for sure). You are counting on the elasticity of the o-ring (hopefully Viton) to be compressed, not harden, and keep a pressure seal. Sealants that swell the o-ring are bad, because the o-ring will eventually shrink back and leak. Sealants that don't stick well to the surfaces that they seal have an issue too - and that surface might be the o-ring.

All that said, I get nervous every time I do a job where the o-ring makes a critical seal. Get your joint really clean, lube with the HPF (or perhaps silicone grease), and do be certain you have a proper fit. If there was much corrosion removed, that might mean a very slightly oversize o-ring - in which case make the effort to be sure you have fluoroelastomer o-ring(Viton is a tradename for one), and don't go so large that it buckles.

Good luck - don't give up!

Mark in Marine

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