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11-29-2021, 02:22 PM | #1 |
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Exhaust manifold glands
All, good day.
On the Model A engine, there are metal glands that insert into the exhaust manifold and also into the exhaust ports on the engine block. When installed these glands keep the manifold exactly aligned with the ports. The width of the glands somehow relates to the depth of the recesses in the manifold and block, plus an allowance for the gasket thickness. What I'm after is the relationship between the width of the glands and the depth of the recesses. I need to deck my manifold assembly to get it flat (and get rid of leaks), and I realize that I need to decrease the width of the glands appropriately. But how much? If I had an unmodified engine I would simply reduce the width of the glands by the amount the manifold decking removed, but my engine has been rebuilt and I presume that the manifold mounting surface was decked at that time. And I'm not sure that the present width of the glands is proper. So my "original" manifold+block combined depth is lost forever. Should the glands allow the manifold to sit flush without the gasket, so that when the gasket it installed the gasket is allowed to crush? Or should some allowance be provided for gasket thickness (say, half of the uncrushed thickness??) Or, does anyone know the original depth of the block recesses? I can measure what I have and deal accordingly. Thanks, all. JayJay
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11-29-2021, 02:40 PM | #2 |
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Re: Exhaust manifold glands
Do the machine work first and then measure. Some find cutting their own rings from steel pipe works better than the rings you can get nowadays as they would be solid round. Personally I would test fit without the gasket.
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11-29-2021, 06:58 PM | #3 |
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Re: Exhaust manifold glands
When I brought my new Aries SS muffler, I didn't use the gland rings on the manifold. My thinking being that one or more will eventually end up inside the muffler. If you keep the manifold torqued to 45 foot pounds, you won't have to wrong about manifold sag.
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11-29-2021, 10:47 PM | #4 |
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Re: Exhaust manifold glands
I agree,
I use them an all the engines I am involved with. They help support the manifold and keep the hot exhaust gasses from the gasket. In the middle of the Model A production for a sort time, Ford did away with them only to re-instate after they confirmed they were necessary. Chris W. |
01-09-2022, 08:01 AM | #5 |
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Re: Exhaust manifold glands
Mild steel or stainless? NAPA sells 1.5" OD aluminized mild steel exhaust tubing by the foot.
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01-09-2022, 12:12 PM | #6 | |
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Re: Exhaust manifold glands
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Quote:
Somewhere on this site is a thread about making the rings but a search will have to be made. |
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11-29-2021, 09:02 PM | #7 |
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Re: Exhaust manifold glands
If they are installed properly they shouldn't migrate. The ones made of actual pipe would be more secure anyway. Ford wouldn't have spent the money to add them if they were unnecessary. They are used to keep hot exhaust gasses off the gasket.
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11-30-2021, 10:30 AM | #8 |
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Re: Exhaust manifold glands
The way I did it was to seat the rings one by one in both the block and the manifold, and then use calipers to measure the amount of ring protruding from the surface at the highest point for each (because on the block side it's unlikely the rings will seat perfectly flat).
You write it all down and then you pair up the numbers for each exhaust port on the block and the manifold. If the exposed ring width on cylinder #1 block-side plus #1 manifold-side is less than or equal to the total width of the ring, then you have sufficient clearance on that cylinder. If it's barely greater than, you should assess the expected width of the compressed gasket and make the call. Side note, Remflex makes exhaust manifold gaskets that are extra-puffy, which helps with sealing and gives a bit of additional clearance, if you don't mind the non-copper look. |
11-30-2021, 10:47 AM | #9 |
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Re: Exhaust manifold glands
Measure once and cut twice, or is it the other way around?
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11-30-2021, 11:30 AM | #10 |
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Re: Exhaust manifold glands
Measure as many times as you like, I didn't think I had to spell it out in detail.
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11-30-2021, 01:31 PM | #11 |
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Re: Exhaust manifold glands
He was making a joke, having a bit of fun.
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11-30-2021, 01:48 PM | #12 |
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Re: Exhaust manifold glands
I like the split rings so that I can expand them to provide a spring fit to keep them in place while I put the manifold on. I have never had one go south to the muffler.
Measure with the gasket off to provide a little clearance for the rings.
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11-30-2021, 08:05 PM | #13 |
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Re: Exhaust manifold glands
I don’t use them anymore. I also don’t have a manifold gasket leak problem. So I think it’s a waste of time. IMO
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11-30-2021, 09:55 PM | #14 |
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Re: Exhaust manifold glands
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12-19-2021, 04:16 PM | #15 |
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Re: Exhaust manifold glands
Me too. Besides, I have an Autolite waffle manifold that hasn't sagged in all these years, it probably won't with my 5 or 6k miles per year either.
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12-20-2021, 12:10 PM | #16 |
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Re: Exhaust manifold glands
Follow up report - the new exhaust manifold finally arrived (five days late, thank you FedEx), I dry fitted it with the old intake manifold and the assembly was straight and consistent within about 0.003". When I fitted the assembly to the block with glands installed but without the gasket it snugged down just fine. So on with the gaskets and tightened to 35 ft-lb. We'll see how it runs once I get the gooseneck back on (had a radiator leak I'm working on at the same time, took this opportunity to clean up the gooseneck.)
JayJay
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12-20-2021, 12:28 PM | #17 |
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Re: Exhaust manifold glands
Be careful installing it as the ears on it are fragile. I have snapped them off more than once I think.
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12-20-2021, 04:34 PM | #18 | |
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Re: Exhaust manifold glands
Quote:
JayJay
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11-30-2021, 09:09 PM | #19 |
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Re: Exhaust manifold glands
I think why most people claim they go into the muffler is people install them wrong and or use them on warped original manifolds. I have never had trouble with them.
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12-01-2021, 09:14 AM | #20 |
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Re: Exhaust manifold glands
I’ve used the gland rings on all the Model A’s I;ve owned, as they keep the manifold aligned to the block. Never had an issue with one getting into the muffler.
When I recently replaced the exhaust manifold with a new one from Brattons, I had both manifolds milled flat and measured and adjusted each gland ring with my bench grinder. Easy and quick to do. Jim |
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