Exhaust flange gasket leaking again

[mudnut]

I tried filing the
flange flat and
then applying
maniseal, but
it only lasted a week.
The new engine
pipe flange is
much thicker steel
and after the excess
pipe was removed
it is still sealed.
Touch wood.

[dom14]

I tried filing the
flange flat and
then applying
maniseal, but
it only lasted a week.
The new engine
pipe flange is
much thicker steel
and after the excess
pipe was removed
it is still sealed.
Touch wood.

I pulled out both the manifold & the pipe and then checked if the excess of pipe goes inside the manifold without any issues.
It appeared to be going ok all the way inside. The excess of the one of the pipes bit bent, but still goes inside all the way.
When I checked the pipe flange I quickly discovered that it's not flat but has about 0.5mm gap in the middle.
I thought about taking the flange out and filing it and then rewelding it. But, it's bit too much fiddling for me.
I reckon two gaskets(instead of one) coupled with generous layer of exhaust gasket sealant should fix the problem for good.

[threedogs]

is there any way you can put a straight edge across the entire manifold to check if its true.
you might be chasing your tail if its not true.

[dom14]

is there any way you can put a straight edge across the entire manifold to check if its true.
you might be chasing your tail if its not true.

That's how I found out the flange is warped in the middle. I used a straight edge steel ruler combined with a feeler gauge.
I didn't do it with the cylinder head end of the manifold. I didn't think it was necessary as the major leak was from the other end.
I will do it anyway. I think it's a very good idea.