Board logo

Repacking a welded up exhaust...
prawnabie - 2/6/10 at 07:18 PM

Hi Guys

My exhaust is getting louder and louder so I am thinking of repacking it with accousti-fil. The only problem is it is a caterham jobbie that is welded around the edge like this one..




Can I just grind the weld off and open it up or are sealed ones pretty much sealed up for life?

Also if I can open it, can I just rivet around the flange with a few blobs of weld to seal it back up or is there a proper sealant I can buy?

Thanks

Shaun

snapper - 2/6/10 at 07:23 PM

Standard silicone sealer will seal it.
Some just cut a large rectangle at the back where itdoes not show then silcone seal and rivet a slightly larger sheet of stainless back on

bi22le - 2/6/10 at 08:11 PM

what any silcone sealent?
Can it be used to plug any little gaps prior to the silencer? I have a little gap on the join from down pipe to silencer.

[Edited on 2/6/10 by bi22le]

dhutch - 2/6/10 at 08:43 PM

quote:
Originally posted by bi22le
what any silcone sealent?

Pretty much, just make sure its not acyclic!

You can get high temp silicon (rated to 300c) but std bathroom stuff does about as well and it a faction of the price. Used it with a thick walled bean can to repair the tintops exhaust after total failure of a weld in the middle of the center section which went on to pass on just the next mot, but with an advisory, the one after that too!

Still somewhat flexible 15k later when i bit the £18 bullet and bought a new center section!

Its also common practice to the use the 300c silicon to seal self-supporting flue pipes on narrowboats, both together and to the stove top.


Daniel

Canada EH! - 2/6/10 at 08:44 PM

The dots on the ends of the can appear to be spotwelds. Drill them out, knock the ends off, repack and rivet back together using the spotweld holes.