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Old 08-22-2017, 05:58 AM   #1
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Exhaust pipe sealant ?

I'm gathering up all my parts to put my exhaust back together on my generator. What sealant if any should I use on the exhaust pipe threads or should I just use copper anti seize ? The guy before did not use any anti seize and the pipe fittings married each other . These connections are prior to the water injection.
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Old 08-22-2017, 06:58 AM   #2
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I have used Permatex ultra high temp copper gasket maker for exhaust on the boat manifolds, both gen and engine and it works and holds up.

On my Onan gen, I sealed exhaust manifold to block with it.
And coated it on some rusty areas of the manifold, and it did not burn off.
Some of the blue paint burned off on top of the gasket maker.
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Old 08-22-2017, 08:28 AM   #3
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Originally Posted by Pack Mule View Post
I'm gathering up all my parts to put my exhaust back together on my generator. What sealant if any should I use on the exhaust pipe threads or should I just use copper anti seize ? The guy before did not use any anti seize and the pipe fittings married each other . These connections are prior to the water injection.
So, this is a HOT, dry joint? I'd use nickel based anti-sieze.
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Old 08-22-2017, 09:28 AM   #4
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So, this is a HOT, dry joint? I'd use nickel based anti-sieze.
Yes this is hot and dry . I'm not sure how hot , but yes I just checked and the nickel based is good for 2400 degrees.
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Old 08-22-2017, 09:34 AM   #5
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Antiseize should be fine for hot and dry pipe threads.
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