Mt. Vernon AE Vent flange gasket

[Harvey Schneider]

Recently when doing a thorough cleaning of my MVAE insert, I managed to tear the vent flange gasket. There is no reason why I can't replace it with another fiberglass reinforced silicone rubber gasket.
I think it might be easier to put together and seal with a high temperature RTV silicone, like Permatex Ultra Copper.
Can anybody see a reason not to use this instead of the silicone rubber sheet material?

 

[Mr. Spock]

Once thing that comes to mind is that the fiberglass reinforced silicone rubber gasket may be a bit thicker/stronger thus maintaining a better seal under vibration and or expansion/contraction cycles.

 

[Mr. Spock]

What did you end up doing? Did you get a replacement gasket or decide to give the RTV a go?

 

[Harvey Schneider]

What did you end up doing? Did you get a replacement gasket or decide to give the RTV a go?

My sheet of gasket material arrived yesterday so I cut a new gasket. The new gasket is a bit thinner than the original but seems to be okay.
The seal isn't as tight as it should be so I may butter it with RTV later. Sometimes the seal improved after the first couple of firings. If it does improve, I'll leave it alone until next cleaning.

 

[mralias]

My sheet of gasket material arrived yesterday so I cut a new gasket.

Could you please share what and where you got this? Thanks.

 

[Harvey Schneider]

Could you please share what and where you got this? Thanks.

This is thinner, harder, denser than the original gasket. It cuts easily with a utility knife. One sheet will yield four vent flange gaskets. If I cut them undersized, I could probably get more, but full sized is easy to handle.
Instead of cutting holes for the two posts, I just made a slit. That way the gasket lays flat and stable while I wrestle with the 4" SS duct.

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