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Question- exhaust manifold

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jlaird

jlaird

Great Pumpkin
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How do you really seal the exhaust manifold to the exhaust pipe. The manifold fits into a flair on the pipe and a clamp peice goes around to hold, What keeps it from leaking?

Even a small leak makes a bad mess on my nice white paint down in there.
 
Just the pinch of the flared clamp holding the flare of the pipe tight against the flare of the manifold. That's one reason the bracket supporting the pipe at the bell housing is so important. It keeps the weight of the exhaust from pulling down on the manifold joint. It still doesn't work very well, for very long. That's another reason I either run a header, or a 1275 exhaust manifold and pipe.
Jeff
 
Hmm, must be a way. Must think on this, some exhaust sealent in a tube for starters. Wish I had a very thin peice of something that would hold.
 
LOL
 
Eventualy it will close up you know, carbon will fill the small hole or holes, but every time you pull the engine it is start all over.
 
Question is if that will happen before the inside has gone from white to black... /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
 
Wasn't there an asbestos (or similar substance) "O" ring that went over the exhaust pipe flange (see part #10, pp60 exhaust manifold illustration in the VB catalogue)( Moss also shows two variations of this "bushing" as they call it - one for 1275 and two for the 948, pp8 in my old catalogue)? I have also used "muffler-seal" paste (from the local Advanced Discount Auto shop) on that gasket for insurance on the seal also!!
 
Mike, it's been so long, I really don't remember. I just went and looked, and none of the 948's I have here have manifolds on them. My old Moss catalogue doesn't show anything there for the 948, and the VB catalogue shows the sealing ring, but it's the same part as a 1275.
I still can't remember there ever being a seal there on the small bores.
Jeff
 
Me too, do not remember anything at all.

Like mike I have always used muffler seal paste but it does not always work as good as it should.
 
Jack, I just remember the male cone on the manifold and the female cone on the pipe. I'll go up to the storage unit tomorrow and see what's on something up there. I'm beginning to have vague memories of a seal.
Jeff
 
Will be learning about that - blew mine apart today. 20 miles into a 120 mile trip. I can't hear a darn thing. Wife can't hear either - now a good time to buy something expensive.

George
 
I just reread some of Terry Horlers book, and he mentions only the conical sealing surfaces of the pipe and manifold. When he gets to the later 1275 cars, he mentions the addition of the sealing ring on those cars to be an improvement over the setup on the earlier vehicles.
Jeff
 
The secret is to have both surfaces very clean, smear a little Koppershield on the parts, just a floor jack to gently push the pipe up to the manifold and clamp it snug.
If you overtighten that clamp, it will distort and never seal.
Make sure the tranny bracket to pipe is in place too.
 
Ahhhh, copper sheld.

Thanks Frank. Will give that a try.
 
Anyone try the exhaust header frequently on ebay? Looks like the $200 $$ diff between (Is the Moss's that much better ??)

Tx-

George
 
When I put the header on my B' I found some stainless band clamps that actually wrap around both pipes, and is held fast with two bolts and a piece of tapered aluminum that cinches the band around the pipes.

They look like this picture I lifted from Jegs.
 

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George Zeck said:
Anyone try the exhaust header frequently on ebay? Looks like the $200 $$ diff between (Is the Moss's that much better ??)

Tx-

George
Click to expand...

George if memory serves me correct the Moss part is an LCB (long center branch) and the Ebay item is not.

Pat
 
You guys are right about the 948 exhaust! On second look at the Moss catalogue, the bushings I was referring to are actually the muffler-mounting rubber bushes...Sorry about that!! Something I tried that actually worked quite well, as I recall, was making a sealing ring to fit into the overlapping cones out of heavy-duty aluminium foil and using the muffler-sealing paste! It has been many years (actually at least a couple of decades!) since I have had to deal with a 948!!!
 
Mike, I suppose you could make one from the aluminum coated sandwich gasket material, too. I've never tried it, just changed to a 1275 manifold or a header. End of problem.
Jeff
 
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