People should always be aware that the use of silicone sealants where an
oxygen sensor is involved is a big no-no.

It the product says 'oxygen sensor safe' on it, it's probably ok then.

If do fine with gasket-to-metal, but flanges must be flat and very parallel
to the port surface, even if it means heating and slightly bending the
exahsut pipe, tho I've barely ever done that.

But mostly, the flange-to-exhaust-port relationship has to be pretty right,
anything else may work for a while, but is more a temporary fix.

Exhaust leaks at the exhaust ports contribute to burning exhaust valves, so
if there are leaks, it's more than just something noisy, it contributes to
wear on other places too.

Scott

www.turbovans.com <http://www.turbovans.com/>

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike Collum
Sent: Friday, March 07, 2008 5:18 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Exhaust flange silicone sealer

I've had several requests for information on exhaust gasket sealer.  I

use it as a gasket dressing and not as a "Replacement" for gaskets.

Permatex Ultra Copper RTV Silicone Gasket:

http://www.permatex.com/documents/tds/automotive/81878.pdf

There are other brands, too, and one calls their product "Mega Copper" RTV.

Of course, you first want to file the mating surfaces flat if necessary.

Mike

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