apt1986
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Registered: 6th Sep 09
Location: West Yorkshire
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Can't seem to get a good enough seal with the ring gasket where the manifold meets the cat.
Bought new ring gasket set and still blowing, any ideas? Do you think it's to do with my fitting the sportex exhaust system? I wouldn't of thought so as both the manifold and cat are still standard?
Andy.
[Edited on 16-08-2011 by apt1986]
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ryanlockie
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Registered: 25th May 10
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I would also like to know this
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apt1986
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Registered: 6th Sep 09
Location: West Yorkshire
User status: Offline
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Anyone?
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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Did you buy new springs aswell? Ive found in the past that the old springs that keep the tension on have gone weak over time and cause it not to seal as well
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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your not doing the spring kit up solid are you? there needs to be some movement...
and are you using any form of sealent?
ideally you want to be putting a little RTV silicone all the way around
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apt1986
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Registered: 6th Sep 09
Location: West Yorkshire
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quote:
Originally posted by Will94
Did you buy new springs aswell? Ive found in the past that the old springs that keep the tension on have gone weak over time and cause it not to seal as well
Yeah, new everything.
quote:
Originally posted by Phillips_91
your not doing the spring kit up solid are you? there needs to be some movement...
and are you using any form of sealent?
ideally you want to be putting a little RTV silicone all the way around
How do you mean? Like as tight as it can go? Then yes, yes i am, should i not?
Not using any sealent, don't have any that would be up to the job.
Andy`
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Edges 58
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Registered: 30th Mar 10
Location: Nottingham
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Coat the ring in exhaust assembly paste before fitting
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
User status: Offline
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back the bolts up slightly!!
they shouldnt be as tight as they possibly go, you may need a new gasket now as you could of fucked the old ones, presuming its a 1.4/1.6 16v then go to local factors and asked for a gmg12 gasket 
and see if you can get hold of some RTV silicone while your there, DO NOT use normal exhaust paste it can fuck the cat!
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Edges 58
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Registered: 30th Mar 10
Location: Nottingham
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quote:
Originally posted by Phillips_91
normal exhaust paste it can fuck the cat!
 really? How so? I used it on mine, 1.2 8v mani-downpipe. Should I not have?
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Jed D
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Registered: 15th Mar 11
Location: Durham
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i have ne springs in mine. its been fine. snapped the bolt once, but just put another on. got split spring washers in like.
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Cossie
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Registered: 17th May 02
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It's a bit confussing here is the manifold gasket the flat one with two holes or the pipe to cat ring one (mesh type) where springs are used?
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
User status: Offline
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quote:
Originally posted by Edges 58
quote:
Originally posted by Phillips_91
normal exhaust paste it can fuck the cat!
really? How so? I used it on mine, 1.2 8v mani-downpipe. Should I not have?
Yes, Bosal the main exhaust manufacturer even states on there information leaflets/posters do not use exhaust assembly paste
(i'm an exhaust fitter btw)
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apt1986
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Registered: 6th Sep 09
Location: West Yorkshire
User status: Offline
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quote:
Originally posted by Phillips_91
back the bolts up slightly!!
they shouldnt be as tight as they possibly go, you may need a new gasket now as you could of fucked the old ones, presuming its a 1.4/1.6 16v then go to local factors and asked for a gmg12 gasket
and see if you can get hold of some RTV silicone while your there, DO NOT use normal exhaust paste it can fuck the cat!
If i back the bolts up slighty, it's going to blow even more? How i have it now doesn't seem tight enough for it to seal.
I really don't get how these crush gaskets work at all, pretty stupid.
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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if you do it up tight its no longer a spring kit, it's just a solid cylinder!
trust me, get a new gmg12, new set of springs and some silicone and DON'T do the springs up tight, just less than a mm gap between each coil will be sufficiant
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apt1986
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Registered: 6th Sep 09
Location: West Yorkshire
User status: Offline
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Which silicone do you recommend & where do i get this RTV silicone?
Andy.
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Phillips_91
Member
Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
User status: Offline
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we use engineering silicone that we get from clampco, www.clampcouk.co.uk give them a ring and ask for the black rtv silicone for infront of the cat 
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