exhaust & Inlet manifold gasket sealants???

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falling-out-with-my-car
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exhaust & Inlet manifold gasket sealants???

Post by falling-out-with-my-car »

Hi, I am appealing to those of you that strip down engines frequently.

is there anything in the modern sealants range that will tolerate exhaust manifold temperatures.?
and what would be best to use as an inlet manifold sealant?

just thought I'd ask as times change and the old Hermitites seem all the harder to get a hold of we used to be able to buy a blue hylomar sealant that set hard but these days it sets soft and golden hermetite seems to have dissapeared altogether, I am wondering if I can use some of the high tech silicone's but knowing which is a bit of a lottery.

any help would be gratefully appreciated, in helping to reassemble my 2cv.

cheers Nigel.
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Re: exhaust & Inlet manifold gasket sealants???

Post by andy5 »

falling-out-with-my-car wrote: I am wondering if I can use some of the high tech silicone's but knowing which is a bit of a lottery.
I've no idea of the answer to that for your Citroen, but there was definitely a special acid-free silicone rubber used by Rover on the plate gasket that covers across the middle of their V8 engine
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Post by Xantidote »

Wasn't it the Blue Hylomar that remained a bit flexible, and the Red Hylomar that set solid? I've still got a tube of the blue lurking somewhere :D
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Post by CitroJim »

There is a high temperature gasket sealant, based on silicone, for exhausts but I have no experience of it. I believe it might be copper-loaded. Try your local factors...
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Post by Gibbo2286 »

I've got half a dozen or so tubes of Red Hermetite still sitting on my shelf here if anybody wants one. (they're sticky on the outside where one leaked.)

And it's correct the blue Hylomar was a non setting sealant developed by Rolls Royce for face to face (no gasket) fits, reckoned to take up 10 thou of tolerance.
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Post by Paul-R »

Xantidote wrote:Wasn't it the Blue Hylomar that remained a bit flexible, and the Red Hylomar that set solid? I've still got a tube of the blue lurking somewhere :D
Almost I think. Green Hermetite set solid, Red Hermetite sort of dried up and went non-sticky and Gold Hermetite remained sticky.

My favourite was also Blue Hylomar. I used to use it on my Alfa Romeo 1300 twin cam engine which needed frequent (!) rebuilds. It was available in aerosol form and a light spray on the headgasket ensured that it peeled off nicely from the ally head and block (cast iron wet liners) so that potentially damaging scraping wasn't needed.
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Post by Peter.N. »

Don't knw about exhaust manifolds but for pretty well everything else I use ordinary silicone sealant. If you apply it to one surface the night before you want to reassemble, it forms a nice soft rubber gasket that doesn't accidentally scrape off.

Peter
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