side shot
Can you use Silicone to seal exhausts? Is there any special type to use?
I'd rather not use Gungum!!!
I used silicone to seal the ends of my repackable silencer - it doesn't get too hot. One end stiuck really well, the other peeled off after a
few weeks.
I used an exhaust sealing cement to join the link pipe to the doen pipe. It worked really well. line the inside of the larger pipe before you push
in the smaller pipe and you shouldn't see it.
this was covered recently, the best idea seemed to be builders heat sealing something or other. Basically the stuff they use when fitting boilers. Never dries out, bit clay like, designed for the job.
There is a specific paste for that job - white stuff that goes hard when it gets hot. It's also supposed to act as an assembly lubricant when
runny. It's not GunGum though - it's pukka stuff.
I didn't bother myself - I used copper grease! All my joints are a good fit, the grease will burn off, leaving a copper residue that will help
me when I next need to take things apart (e.g. for repacking the silencer). It's bl**dy hard to separate the proper stuff after it's
hardened.
David
Theres 2 kinds of High temperaturte plumbers silicone used.
1 is for sealing between sections of boilers and that never really sets
And (PlumbaFlue trade name me thinks) thats high temperature silicone, upto about 400 DegC that is used to seal imbetween sections of Flue that sets
like normal silicone
quote:
Originally posted by David Jenkins
There is a specific paste for that job - white stuff that goes hard when it gets hot. It's also supposed to act as an assembly lubricant when runny. It's not GunGum though - it's pukka stuff.
I didn't bother myself - I used copper grease! All my joints are a good fit, the grease will burn off, leaving a copper residue that will help me when I next need to take things apart (e.g. for repacking the silencer). It's bl**dy hard to separate the proper stuff after it's hardened.
David
Holts Firegum aka exhaust assembly paste.
That's the stuff!
Wouldn't use it again though - it's a damn fine cement when it sets.
David
I find most exhaust pastes just crack and leak on bike engined cars (probably due to the vibration. I was recommended the Bosal putty as an
alternative. But as I couldn't get hold of any I used the othe slternative clear silicone sealant (yes it must be clear so as to not contain any
chalk which is usually the pigment carrier). I have regularly used silcone and it has worked very well. One tip is to make sure the silicone has
properly cured before starting the engine and running hot gasses through the pipe.
Multipart exhausts seal via the expansion of the inner tube within the sleave so should not require further sealing. Repackable silencers however
tend not to get a deformed seal concentrated around the rivets and a bead of silicone is just the job to form a seal.
- Jim
I have used the non setting type of sealant on my silencer, it was marked as suitable for sealing around fire doors etc and swells with heat. I found
it alsts better than the setting type and is easier to seperate when required, it also has no acetic acid in it.
Paul.
quote:
Originally posted by MkIndy7
Theres 2 kinds of High temperaturte plumbers silicone used.
1 is for sealing between sections of boilers and that never really sets
And (PlumbaFlue trade name me thinks) thats high temperature silicone, upto about 400 DegC that is used to seal imbetween sections of Flue that sets like normal silicone