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Exhaust gasket
Posted: Wed Oct 02, 2013 9:04 pm
by djh66
Just replaced my main oil seal and rebuilding the engine (LIS GT186). The new gasket set I've purchased has a thick gasket material type exhaust gasket, I've always used copper gaskets before, is there any reason I should not use the provided gasket?
Re: Exhaust gasket
Posted: Wed Oct 02, 2013 9:19 pm
by speedy
There is no reason you can't use it,but they are not as good as a copper faced one.To be honest, for a couple of quid i'd personally buy a separate copper faced one.Some years ago on a cast cylinder,i used to use a solid copper gasket that Dave Webster used to make.They were re useable and never blew.Cheers,Speedy.
Re: Exhaust gasket
Posted: Wed Oct 02, 2013 9:32 pm
by djh66
Can I re-use the copper gasket I took off?
Re: Exhaust gasket
Posted: Wed Oct 02, 2013 9:41 pm
by Muttley McLadd
Is it solid, or one of the ones that bends when it's tightened?
Re: Exhaust gasket
Posted: Wed Oct 02, 2013 9:43 pm
by djh66
the later
Re: Exhaust gasket
Posted: Wed Oct 02, 2013 9:45 pm
by Muttley McLadd
Mag to grid..
Scooter Restorations do the solid ones for next to nothing.
No cheese involved in the making
Re: Exhaust gasket
Posted: Sat Oct 05, 2013 9:22 am
by mickdale
Muttley McLadd wrote:Mag to grid..
Scooter Restorations do the solid ones for next to nothing.
No cheese involved in the making
don't the solid ones need annealing when using/re-using?
Re: Exhaust gasket
Posted: Sat Oct 05, 2013 9:26 am
by Muttley McLadd
mickdale wrote:don't the solid ones need annealing when using/re-using?
That's less effort than a rebore/piston/crank/head change because the cheese one has disintegrated at 75mph in the outside lane of the motorway.
The downpipe on my clubman is made in such a way that the head cowling comes off without the need to loosen the exhaust. There's no reason to remove the downpipe that I can think of.
Re: Exhaust gasket
Posted: Sat Oct 05, 2013 10:49 am
by dapper
mickdale wrote:Muttley McLadd wrote:Mag to grid..
Scooter Restorations do the solid ones for next to nothing.
No cheese involved in the making
don't the solid ones need annealing when using/re-using?
Someone once told me to heat up the solid copper gasket until cherry red and then allow to cool. I totally feckin ignored him,
and linnished both sides of the solid copper gasket on a piece of glass with wet 'n dry taped to it, to ensure it was perfectly flat. I do this to the U bend exhaust gasket face too to ensure I get the best seal possible. Also a smear of high temperature silicon on all faces.
Re: Exhaust gasket
Posted: Sat Oct 05, 2013 5:34 pm
by Grumpy225
It's the opposite for copper. Heat then cool with cold water. Makes it softer. I anneal my copper soft jaws on my vice like that.
Your best leak prevention is from surfacing your exhaust flange (either a stub or U bend).
http://m.youtube.com/watch?v=_o59kYl8DoI