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Is Exhaust sealant necessary?

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lozza
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Joined: 23 Sep 2010
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PostPosted: 14:47 - 24 Feb 2011    Post subject: Is Exhaust sealant necessary? Reply with quote
hi, im putting in a new exhaust gasket soon as my nsr 125 is running like crap after i reconnected the exhaust using the same gasket.

the gasket is one of those large metal rings (honda call them springs?).

im just wondering if its actually necessary to use exhaust sealant as well or does it work just as well without it?
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lozza
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PostPosted: 15:00 - 24 Feb 2011    Post subject: Reply with quote
ah thanks.

was worried because i had ordered some paste stuff from ebay, and have just been reading up on how unreliable it is because it sets brittle.

wasnt looking forward to having to remove the exhaust and replace the gasket again when the paste decided to go crumble
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DrDonnyBrago
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Joined: 03 Jan 2010
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PostPosted: 15:05 - 24 Feb 2011    Post subject: Reply with quote
Laurencem wrote:
ah thanks.

was worried because i had ordered some paste stuff from ebay, and have just been reading up on how unreliable it is because it sets brittle.

wasnt looking forward to having to remove the exhaust and replace the gasket again when the paste decided to go crumble


You don't need it at the cylinder head if your downpipe gaskets seal well.

You sometimes need it to fit the link pipe or endcan if it leaks when you run it. Exhaust assembly paste (firegum etc) is supposed to come off easily, exhaust repair paste (gun gum etc) is not. If you bought repair paste, dont use it for an assembly job Thumbs Up .
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lozza
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PostPosted: 15:16 - 24 Feb 2011    Post subject: Reply with quote
not quite sure what you mean there donny

its hylomar eap5 - exhaust assembly paste

its just that after googling exhaust paste everyone seems to bash it saying that it crumbles away pretty quickly and leaves them with a blowing exhaust.

it is quite difficult getting the pipe collar into proper contact with the head, let alone keeping the gasket in place while you get it there.

gonna take it off again in a sec and clean up the contact surfaces as the gasket should arrive tomorrow.

i was thinking of lubricating it with some kind of oil to ease the assembly but i guess it would just burn away and then leave a gap between the surfaces.
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fiery tupp
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Joined: 24 May 2010
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PostPosted: 17:30 - 24 Feb 2011    Post subject: Reply with quote
Laurencem wrote:


it is quite difficult getting the pipe collar into proper contact with the head, let alone keeping the gasket in place while you get it there.


Just stick the gasket in the head with a little grease , to hold it in place .
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lozza
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PostPosted: 17:32 - 24 Feb 2011    Post subject: Reply with quote
rusty sprocket wrote:

Just stick the gasket in the head with a little grease , to hold it in place .


thats what i was wondering - what kind of grease can i use
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fiery tupp
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PostPosted: 17:33 - 24 Feb 2011    Post subject: Reply with quote
Any it'll just burn off anyway .
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lozza
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PostPosted: 17:48 - 24 Feb 2011    Post subject: Reply with quote
ok! thanks for the answers
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DrDonnyBrago
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PostPosted: 09:54 - 25 Feb 2011    Post subject: Reply with quote
Laurencem wrote:
not quite sure what you mean there donny

its hylomar eap5 - exhaust assembly paste

its just that after googling exhaust paste everyone seems to bash it saying that it crumbles away pretty quickly and leaves them with a blowing exhaust.

it is quite difficult getting the pipe collar into proper contact with the head, let alone keeping the gasket in place while you get it there.

gonna take it off again in a sec and clean up the contact surfaces as the gasket should arrive tomorrow.

i was thinking of lubricating it with some kind of oil to ease the assembly but i guess it would just burn away and then leave a gap between the surfaces.


Didn't mean to confuse you, my comment concerned the type of exhaust paste you bought, you wouldn't be the first to assemble an exhaust with repair paste Very Happy but it seems you bought the right stuff anyway.

You shouldn't need paste around where the downpipe fits unless you have a crap seal. If you have a crap seal then a load of assembly paste is the bodge way of doing it, you'd be better off trying again to get a good seal with a new gasket. One place where you might need paste is around where other parts of the exhaust fit onto the downpipe(s) as these often come without gaskets and can leak. Assembly paste is designed to be brittle and come apart so that you can take the exhaust off afterwards.

I use copper grease to fit gaskets as whenever I have had to remove them they have been a pig to do but any grease will be fine just to hold the gaskets in place. When the grease burns off it wont leave a gap, 99% of it will have been forced out of the gap when you tightened down the downpipe collar anyway.
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neil.
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PostPosted: 10:26 - 25 Feb 2011    Post subject: Reply with quote
Copper grease all over the gasket before you fit it. Thumbs Up
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lozza
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PostPosted: 10:55 - 25 Feb 2011    Post subject: Reply with quote
Quote:
Didn't mean to confuse you, my comment concerned the type of exhaust paste you bought, you wouldn't be the first to assemble an exhaust with repair paste Very Happy but it seems you bought the right stuff anyway.

You shouldn't need paste around where the downpipe fits unless you have a crap seal. If you have a crap seal then a load of assembly paste is the bodge way of doing it, you'd be better off trying again to get a good seal with a new gasket. One place where you might need paste is around where other parts of the exhaust fit onto the downpipe(s) as these often come without gaskets and can leak. Assembly paste is designed to be brittle and come apart so that you can take the exhaust off afterwards.

I use copper grease to fit gaskets as whenever I have had to remove them they have been a pig to do but any grease will be fine just to hold the gaskets in place. When the grease burns off it wont leave a gap, 99% of it will have been forced out of the gap when you tightened down the downpipe collar anyway.


thanks man, answered my question perfectly.
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Pete.
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PostPosted: 13:08 - 25 Feb 2011    Post subject: Reply with quote
If you have a new gasket, fit it with no paste. Make sure you get the old gasket out (and possibly the one that was in htere before it) because it can be hard to tell there's a squashed gasket still stuck in the pirt. The port face should be smooth, a stuck gasket will have annular rings and ridges.

If you find that the new gasket you have fitted still doesn't seal, get another and fit it with the paste on both sides. It does cure hard, and brittle, but when sandwiched between the gasket and exhaust parts as a thin filler it's well enough supported to stay in place and do it's job.

The main reason why an exhaust would not seal in the port with a new gasket is if it had been repaired by welding and sitting out of line.

The reason you see so many negative comments about exhaust paste is because people try to get by with using it to bodge a rusted exhaust. It doesn't last long there.
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