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Is Permatex ULTRA COPPER high temp rtv silicone gasget maker a suitable product to use on an intake manifold gasget. I would like to use a sealant. (I noticed on the back it says not for use on head gasgets or where it will contact gasoline)
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Re: INTAKE MANIFOLD GASGET SEALER
Rob----
Permatex Ultra Copper is fine for intake manifold gaskets. However, I would only use it SPARINGLY around the water passages and a small "dab" at each corner where the side gaskets meet the end seals (if you use the stock-type end seals). That's it. Don't use any sealer elsewhere on the manifold gaskets. It's not necessary and it will do more harm than good. The factory used NONE.
I do recommend the use of Ultra Copper in place of the intake manifold end seals. It's not "stock" or "original", but it will seal a lot better if it's done right.
You cannot use Ultra Copper (or any other commonly available RTV silicone sealer) on areas exposed to gasoline. These types of sealers are DECIDEDLY not impervious to gasoline and certain other solvents. They will degrade RAPIDLY exposed to gasoline. If you want to use an RTV silicone in an application that involves exposure to gasoline you must use a FLUROELASTOMER. You won't find these in any auto parts store, though. These are strictly for industrial applications and they're VERY expensive (like $50+ for a SMALL tube).In Appreciation of John Hinckley -
Re: INTAKE MANIFOLD GASGET SEALER
Rob,
TO add to that - the way I've done the ends is lay down a bead of sealer instead of the end seals like Joe suggested and let it 'skin' then install the manifold - someone mentioned that to me and it seems to have worked well for me. Good luck,Comment
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if you use silicone sealer as the end gaskets
make sure that you "tin" the surfaces with sealer by rubbing it onto both surfaces with your finger. this will make sure the sealer "wets" the block and the manifold for a good sealComment
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Re: if you use silicone sealer as the end gaskets
clem-----
Even better is a special RTV primer used in the aerospace industry. Applied about 15 minutes before application of the RTV and allowed to dry, it makes RTV stick like glue. The only problem is that a pint can costs about $50 and has a shelf life of about 6 months, or less. I bought some once and it worked great. Unfortunately, I only used about 1/4 oz for the job I was doing and the other 15-3/4 ounces was no good by the time I wanted to use some again.In Appreciation of John HinckleyComment
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