Spring loaded bolts, how tight?

[Beas]

Hey just a quick question.
On the cat to the manifold joint how tight do you do the spring loaded bolts up? all the way?
Cheers

 

[kristian]

Hey just a quick question.
On the cat to the manifold joint how tight do you do the spring loaded bolts up? all the way?
Cheers

i wasnt sure either when i did mine the other day i did mine tight because it blew otherwise.

 

[Henry]

all the way

 

[sideways danny]

do them all the way up to the stops

 

[Beas]

cheers for the replys. i had it fitted by a garage ages ago because it was blowing at 2000revs but now it seems to have come back at 2100revs, not quite so bad though. so i though maybe it just needs tightening up a bit more. if i put my hands over the tail pipes nothing comes out of the joint so would this meen it is done up tight enough. i just cant figure out where its coming from and its starting to get on my nerves. lol

 

[sideways danny]

using cheap fuel?

 

[kristian]

using cheap fuel?

that make a difference?

 

[Beas]

Bp!? sometomes bp ultimate

 

[Henry]

is it the original cat?

i fitted a (new) decat to mine, just to see if it would cure the blowing, as the mouth of the cat was pitted due to corrosion (where it sits over the mesh ring gasket thing on the manifold). decat cured the blowing, but came off due to the noise. possible you've the same problem; lots of them blow from what i've read

 

[Beas]

yes it is i take it. can you use sealent in that area or is it not a good idea?

 

[Henry]

you can't use any sealants pre-cat unfortunately, as they could make their way through the cat and damage it as they're burnt

if that's what's causing your prob, there's not much you can do about it easily - i did look into brazing the pitting and refinishing it (lots of work), or cutting off the mouth of the cat and welding another on (impractical for me, as the metalwork's v thick at that point and didn't want to risk bodging it and writing off the cat)

you couldn't be sure that this pitting's a probability in your case without looking at the cat though

 

[sideways danny]

that make a difference?

low rpm detonation can sound just like a blowing exhaust

 

[kristian]

low rpm detonation can sound just like a blowing exhaust

got ya!

 

[Beas]

So if i took the cat off would i be able to re-use the gasket or is i one of those ones where if you take it appart then thats it?:S

 

[Henry]

if it's not been on long, you might get away with re-using the mesh ring gasket; if not, they are available individually for about a fiver

if there's any pitting, it'll be at the outer edges of the cat mouth and you might actually be able to see it without removing anything

not saying it's what's causing your prob, although it can't help with sealing if it is pitted