Just how flat does the exhaust manifold mating surface need to be?!
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Mountain Pass
Joined: Feb 2003
Posts: 149
Likes: 5
From: UP of Michigan
Just how flat does the exhaust manifold mating surface need to be?!
I recently purchased another old (1999) expedition with 139k miles. The previous owner had the exhaust manifold changed at some point with Dorman pieces, but the cheap gasket used blew out about a year ago at the the front of the #1 port. The manifold isn’t too bad so I was consider reusing it but I checked the plane and it is not as flat as expected! A little concave (especially #4 cylinder). Does anyone know if this is normal??
thanks!
thanks!
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Mountain Pass
Joined: Feb 2003
Posts: 149
Likes: 5
From: UP of Michigan
I think I’ll be replacing this manifold due to pitting, but still curious about the plane question if anyone knows.
Im a little concerned about pitting on the head also but I’m not about to take that off at this point.
I see a lesson here about not letting your manifold leak go on too long!
Im a little concerned about pitting on the head also but I’m not about to take that off at this point.
I see a lesson here about not letting your manifold leak go on too long!
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
When I replace exhaust manifold gaskets, I put 2 sets back on each side, along with exhaust sealer sandwiched between them. The sealer takes up any potential gaps, and to date, no exhaust gasket I've done this to has ever leaked.
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Mountain Pass
Joined: Feb 2003
Posts: 149
Likes: 5
From: UP of Michigan
I purchased a triple layer metal gasket set to use but I have my doubts with the head surface being less than flat and smooth.
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
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Mountain Pass
Joined: Feb 2003
Posts: 149
Likes: 5
From: UP of Michigan
It’s all back together and sounds like a good seal. I used the Mahle metal gasket set plus Hi Temp Copper RTV between the head and gasket, plus SS hardware. I’m really really hoping this holds “forever”
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