Exhaust mixer gasket sealant?

[Bathdave]

I am in process of replacing the mixer elbow on my Yanmar 3JH3E and am unclear whether I should be spreading some gasket sealant paste or something similar on the gasket or not. I had always understood (years ago drummed into me by engineer father )that you did, but the gasket seems to be two thin plates of aluminium with a rubber sandwich, rather than the types of material used in the paste in car engines.

A couple of Google searches has suggested that I shouldn't use sealant.

Any guidance gratefully received !

 

[RichardS]

I am in process of replacing the mixer elbow on my Yanmar 3JH3E and am unclear whether I should be spreading some gasket sealant paste or something similar on the gasket or not. I had always understood (years ago drummed into me by engineer father )that you did, but the gasket seems to be two thin plates of aluminium with a rubber sandwich, rather than the types of material used in the paste in car engines.

A couple of Google searches has suggested that I shouldn't use sealant.

Any guidance gratefully received !

I always use a smear of copper grease on both sides of exhaust gaskets. If the manifold surface was really uneven and wouldn't seal with copper grease I might try a high temperature sealant but I've not yet encountered that problem.

Richard

 

[Poignard]

I wouldn't use any compound with a gasket like that.

 

[macd]

I wouldn't use any compound with a gasket like that.

+1
If the faces are clean and true, there should be no need for sealant.

 

[prv]

I've never used any sealant on the Volvo equivalent. Although Richard's idea of a little copper grease might make future dismantling slightly easier; I might try that next time.

Pete

 

[NormanS]

I use "Copaslip" for all these sort of things. (Is that your copper grease?) Copaslip is an assembly compound for temperatures up to 1100°C, so would seem to be eminently suitable for an exhaust flange joint. To be honest, I use it for all sorts of things, hot and cold, dry and wet.

 

[RichardS]

I use "Copaslip" for all these sort of things. (Is that your copper grease?) Copaslip is an assembly compound for temperatures up to 1100°C, so would seem to be eminently suitable for an exhaust flange joint. To be honest, I use it for all sorts of things, hot and cold, dry and wet.

To all intents and purposes, it is indeed a brand name for the same stuff.

Richard