I fitted a singlepipe a few weeks back all was fine (i moved it about a bit to stop it touching the rear bumper) but today i noticed that its bloody blowing slightly at where the exhaust meets the decat pipe

My mate helped me fit and he put the gun gum paste on, he's away on holiday but is it a case of removing putting more gungum (or whatever) on again or will it never seal properly? - unfortunately i dont have a gasket for the decat pipe but was under the impression gun gum paste would do???

Failing that can you buy sort of metal gasket card that you can make your own, is it something halfords would sell etc?

Basically would gasket paste do, the flanges seem to match up well not 100% but 98%

Thanks

 

You can:

a) Make your own gasket - Any car part company should have the material.

b) Buy the correct gasket - The shape doesn't need to be perfect, so a gasket for another car will suffice if it's approximately correct.

c) Use paste, liberally.

Either way, you'll have to get under the car at some point, so I'd try and source the correct gasket and use paste in the mean time.

Making a gasket template from card will ensure you choose a gasket that will fit properly if you cannot source a genuine one.

 

Yeah, I used paste on my BC Spec IV when I lost the gasket.

It was fine.

 

I;ve used it too with no problems

 

I'm curious about this. I don't have any mechanical knowledge, other than what I've gathered from here and the service manual, so please forgive me.

I read that you shouldn't use exhaust paste when it comes to fitting the cat. I can't remember why not though. Any reason why I shouldn't, that anyone knows of?

Incidentally, I passed my MOT yesterday, despite having lambda sensor problems. Secondary one has been replaced, so the fact that I have passed the MOT suggests that the primary one needs replacing, yes?

(If I've passed emissions, I guess the the cat is working?)

 

Scott,

The only reason you wouldn't use exhaust paste on the cat is if you are one of these people that thinks plastering the entire tube of liquid gasket onto the flange only to see 99.9% splurge out upon compression, is a good idea.

Yeah, primary one will need replacing

 

If its a tiny hole/gap use paste - any bigger and I've found within a few weeks it just blows it open again.

 

Whats the best paste to use, it blow 'slightly' at each side.

From exhaust to decat pipe (flanges inbetween).

 

Never use Gun Gum to patch a rotten pipe; go see Miss Whiplash instead if you want a hiding to nothing...

 

using paste after the cat is fine (like you are) but it should never be used before the cat as it will block the cat (some always gets squashed into the middle of the exhaust when you use it how ever careful you are, and gets burnt off).