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+--- Thread: Gasket between flexi pipe and cat (/thread-30083.html)
Gasket between flexi pipe and cat - Pretty Mouth - 04-04-2026
Hi all,
2018 Peugeot Partner 1.6 Van HDI Blue, bought about 9 months ago. It has a small leak on the exhaust, at the join where the catalytic converter meets the flexi pipe - you can see the soot deposits in the photo.
The flexi pipe was replaced by the vendors mechanic just before I bought it, and I think the leak was probably there the whole time I have owned it
I removed the clip thats hold the two parts together, and there is no sort of gasket between the two parts, just metal to metal. I assume that there should be some kind of gasket there - is there a specific part for this, or should I use some sort of exhaust assembly paste? I have some K2 high temp (350 deg C) silicone, that claims to be sensor safe, could this be used?
Any help appreciated.
[attachment=10521]
RE: Gasket between flexi pipe and cat - brodfather11 - 04-04-2026
Its normally a metal to metal joint but it would'nt hurt to put a smear of firegum or similar on the faces if the joint.
Firegum is/was a heat resistant paste the was used for exhaust pipe joints , it was very good , it hardened with the heat , i dont know about your silicon stuuf as when i was working there was no such thing.
RE: Gasket between flexi pipe and cat - Pretty Mouth - 04-04-2026
(04-04-2026, 02:04 PM)brodfather11 Wrote: Its normally a metal to metal joint but it would'nt hurt to put a smear of firegum or similar on the faces if the joint.
Firegum is/was a heat resistant paste the was used for exhaust pipe joints , it was very good , it hardened with the heat , i dont know about your silicon stuuf as when i was working there was no such thing.
Perfect, thanks for your help with this. I can get it from Halfords on Monday, and get it sorted at last. Thanks again.
RE: Gasket between flexi pipe and cat - jw4821 - 20-04-2026
You’ve probably fixed it by now but whilst you were under the van did you check further down the exhaust? My van is the same year and my exhaust failed just after the DPF which resulted in it being dragged along the floor. Thankfully it just needed a new exhaust and the DPF was able to be repaired but it was nearly a very very expensive job!