Ferrino
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| posted on 26/1/07 at 02:13 PM |
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RTV Sealant
I need to apply some high-temp RTV sealant to the 4-2 join on my stainless exhaust manifold, as I get a slight leak which I'd like to sort out.
I've tried it before and it has blown out within miles as I wasn't very thorough when cleaning off the carbon deposits on the pipes and
may have not let it cure for long enough. I now want to do it properly!
I was told to bring the surfaces back to a shiny finish with something like Scotchbrite, so will do this. But how about the curing process - is it too
cold for it to cure properly with the current weather (ie. nothing close to room-temp in the garage)? Or could I just stick a heater in there for a
while.
Thanks, I know this sounds a bit petty but it's something I want to get right as it's a bit of a pain to disassemble the manifold every
time I try to seal it up.
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macnab
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| posted on 26/1/07 at 02:30 PM |
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I use gun gum, fab stuff just don't use alot as it expands
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bbwales
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| posted on 26/1/07 at 02:35 PM |
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Hi,
I have found fire gum to work very well. We used to use it on the Jag engines in the CVR(T) range of tanks on their exhausts
Bob
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jimgiblett
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| posted on 26/1/07 at 03:26 PM |
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I wouldnt bother with RTV as the pigments tend to be chalk based and dont like heat much. Use a good quality "Clear" silicone
sealant eg. Unibond.
- Jim
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Ferrino
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| posted on 26/1/07 at 04:02 PM |
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Thanks guys - definitely won't be using that fire/gun-gum stuff as it was nearly impossible to disassemble my old manifold with that! I have
already bought some high-temp RTV (rated to 350 degrees C) so will give that a go for now.
BTW, where can I buy Scotchbrite?!?
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RazMan
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| posted on 26/1/07 at 04:46 PM |
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quote:
Originally posted by Ferrino
BTW, where can I buy Scotchbrite?!?
The kitchen section in the supermarket - it is the green scratchy stuff used for scouring pots 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Confused but excited.
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| posted on 26/1/07 at 05:33 PM |
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You could always warm you pipes up with a hair dryer.
Tell them about the bent treacle edges!
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rusty nuts
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| posted on 26/1/07 at 07:32 PM |
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Might be better to make sure the manifold gasket surface is flat . Had the same problem with mine and after the third attempt to seal it I took the
manifold off and cut the mounting plate so that each pipe was seperated .Have had no problems with leaks since
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britishtrident
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| posted on 27/1/07 at 04:40 PM |
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quote:
Originally posted by Ferrino
Thanks guys - definitely won't be using that fire/gun-gum stuff as it was nearly impossible to disassemble my old manifold with that! I have
already bought some high-temp RTV (rated to 350 degrees C) so will give that a go for now.
BTW, where can I buy Scotchbrite?!?
RTV sealers just aren't suitable for the area
Firegum standard motor trade practice for sealing exhaust joints it dosen't cause any problems dismantling.
Gum-gum is even less of problem but is intended for big holes..
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Ferrino
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| posted on 27/1/07 at 05:31 PM |
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That's odd because one of the intended applications of the RTV product I have is for the sealing of exhaust manifolds and has been highly
recommended - will let you know how I get on! I definitely used GunGum on my last manifold and it was just a pig to get off!
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RazMan
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| posted on 27/1/07 at 06:06 PM |
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I was told that RTV is used a lot by the racer boys - it allows easy disassembly but still seals well enough to be effective.
[Edited on 27-1-07 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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