Does anyone supply metail exhaust manifold gaskets?

[sunnystag]

I keep getting leaks between exhaust manifold and head. Engine is in situ. So ensuring the heads on the exhaust side are totally flat is not possible. The available gaskets just fail after some time. Researching seem to find that with the manifolds being iron, they expand different rate to Ali heads thus relative movement occurs at the join. Modern cars with such a join seem to often have 3 layer metal gaskets, that allow for movement. Does anyone know if anything similar is available for the stag?

[stag8manod]

Hi Sunny,
My suggestion is to remove the cast manifolds and have then machined flat and refit with the available gaskets very carefully in rotation.
Cheers Ian A

[sujitroy]

here in USA. they put them on a belt sander type thing.

[richardthestag]

no gaskets on mine between the manifold and the head, they kept blowing,

cleaned up the mating face and used exhaust mating paste. not had an issue since

[sunnystag]

thanks for feedback. i think taking the manifolds to a engineering shop to be skimmed flat will be next step for sure. If no multi layer metal gaskets are available, do i try no gasket as original or exhaust paste or any particular one of the various sealent compounds available?
I am not keen on a paper/cork type gasket. Any recomendations on a paste / sealent compound that holds up and lasts in this high temp and slight movement location?

[flying farmer]

I prefer no gaskets if I can get everything flat enough. I have also had gasket problems but have noticed they need re-tightening after a while which suggests they continue to compress once fitted

Exhaust paste seems to work ok, but silicon gasket sealant also works ok and I once cured a blowing joint by dribbling Smoothrite paint into the crack since it was on the top of the joint and takes a lot of heat to burn off.

Neil

[mjheathcote]

Original cast iron manifolds don't use gaskets.
Made my own when I first fitted tubular manifolds.
A couple of years ago one started to blow, and I managed to slide a new one in, this time using a gasket set generally available from the usual suppliers.

[Stagdad]

I prefer no gaskets if I can get everything flat enough. I have also had gasket problems but have noticed they need re-tightening after a while which suggests they continue to compress once fitted

Exhaust paste seems to work ok, but silicon gasket sealant also works ok and I once cured a blowing joint by dribbling Smoothrite paint into the crack since it was on the top of the joint and takes a lot of heat to burn off.

Neil

I used a high temp flue silicone sealant on my exhaust up stream of the o2 sensor and it killed it, then I read up on it and it confirmed silicone will kill o2 sensors.

[flying farmer]

I used a high temp flue silicone sealant on my exhaust up stream of the o2 sensor and it killed it, then I read up on it and it confirmed silicone will kill o2 sensors.

Must remember that as I think that is what killed one of my o2 sensors.

Fortunately not a problem for most Stag owners, only those of us who go high tech

Neil

[Stagdad]

Must remember that as I think that is what killed one of my o2 sensors.

Fortunately not a problem for most Stag owners, only those of us who go high tech

Neil

It also applies to silcone in the induction as well of course.