In a message dated 9/26/05 5:05:00 PM, macdonald1987@SBCGLOBAL.NET writes:

<<  Seems that

the bolt part of the flanges seems to be fine but the part in the middle

of the flanges is leaking air. I am using the metal one side gaskets

which is correct for this van. I am looking for ideas for what to do

next to solve this since I don't think the van will pass smog even if I

get the pipe leak fixed. The O2 sensor is adding more fuel. Do the

flanges warp? Can they be fixed or ground flat? Is there a sealent

that can be used on the gaskets that won't affect the O2 sensor?

William >>

Forget the exhaust sealant, it will quickly blow out of the joint.  The
flanges have to be faced.  A good tool for this is a stationary disk sander.  If
you know how to use a file, that will also serve the purpose.  I've had exhaust
flange fasteners loosen, but I never had a warped flange.  Are the gaskets
installed correctly with the metal side to the head?

George