The Ford Barn

DaveBPT · 05-24-2019, 05:57 PM

Pretty much a newbie to A's and I'm trying to get the exhaust pipe to seal at the manifold. The manifold outlet appears oval vs round. What is it supposed to look like?

J Franklin · 05-24-2019, 06:08 PM

Does it appear oval or measure oval? It shouldn't be oval but could be eroded.

Joe K · 05-24-2019, 08:05 PM

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The connection is a heroic sized taper compression fitting. The manifold is the male part and the sealing surface describes the side of a 45 degree cone - and the pipe is the female part which is held in place by the two piece coupler.

Getting the two tapered cones to mate precisely is the problem. Problems arise with the manifold portion in that the surface can be corroded, or the manifold may have "dropped" because of heat/age/gravity/loading by the muffler pipe and caused a mis-alignment.

Or the pipe might be a later replacement where the installer did not bend the pipe properly to produce proper sealing. This is one of those parts you frequently have to "tweak" the alignment by strong arm methods, or by hammering or swaging the female cone portion of pipe.

The retailers sell a "gasket" materials for use in this area - but my experience is that gasket WILL NOT stay put and you end up chasing yet another leak and doing the job all over again. Much better to get the proper metal to metal seal, and use a little pipe dope to lubricate the fit, and grease the clamp application. Heating will cure the pipe dope.

Also reproduction clamps are known for being "undersized" and don't fully hold the pipe to the manifold. A good original is probably your best bet, if one can be found.

Hope this helps.

Joe K

05-24-2019, 05:57 PM	#1
DaveBPT Member Join Date: Aug 2016 Location: Pleasant Hill, Mo Posts: 64	exhaust manifold outlet shape Pretty much a newbie to A's and I'm trying to get the exhaust pipe to seal at the manifold. The manifold outlet appears oval vs round. What is it supposed to look like?

05-24-2019, 06:08 PM	#2
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,969	Re: exhaust manifold outlet shape Does it appear oval or measure oval? It shouldn't be oval but could be eroded.

05-24-2019, 08:05 PM	#3
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: exhaust manifold outlet shape Sponsored Links (Register now to hide all advertisements) The connection is a heroic sized taper compression fitting. The manifold is the male part and the sealing surface describes the side of a 45 degree cone - and the pipe is the female part which is held in place by the two piece coupler. Getting the two tapered cones to mate precisely is the problem. Problems arise with the manifold portion in that the surface can be corroded, or the manifold may have "dropped" because of heat/age/gravity/loading by the muffler pipe and caused a mis-alignment. Or the pipe might be a later replacement where the installer did not bend the pipe properly to produce proper sealing. This is one of those parts you frequently have to "tweak" the alignment by strong arm methods, or by hammering or swaging the female cone portion of pipe. The retailers sell a "gasket" materials for use in this area - but my experience is that gasket WILL NOT stay put and you end up chasing yet another leak and doing the job all over again. Much better to get the proper metal to metal seal, and use a little pipe dope to lubricate the fit, and grease the clamp application. Heating will cure the pipe dope. Also reproduction clamps are known for being "undersized" and don't fully hold the pipe to the manifold. A good original is probably your best bet, if one can be found. Hope this helps. Joe K __________________ Shudda kept the horse.