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Old 01-23-2019, 10:28 PM   #1
stewgee
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Default Bad manifold gaskets

Hello all
Can someone tell me what the best exhaust/intake gaskets are. I have had a heck of a time getting my 30 A going after installing all new gaskets from the complete set from Mac's. I just pulled the intake and exhaust manifolds and the gaskets are shot. There is signs of leakage from all ports and a portion of the rear gasket was blown away. All manifolds bolts were torqued per specs. Any thoughts would be welcomed.
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Old 01-23-2019, 10:43 PM   #2
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Default Re: Bad manifold gaskets

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Originally Posted by stewgee View Post
Hello all
Can someone tell me what the best exhaust/intake gaskets are. I have had a heck of a time getting my 30 A going after installing all new gaskets from the complete set from Mac's. I just pulled the intake and exhaust manifolds and the gaskets are shot. There is signs of leakage from all ports and a portion of the rear gasket was blown away. All manifolds bolts were torqued per specs. Any thoughts would be welcomed.
Are your manifold gasket surfaces flat and parallel with each other? Are you using the gland rings? Is your exhaust manifold 'drooping' on the back end?

I like the late '31 copper gaskets. https://www.snydersantiqueauto.com/c...nifold-gaskets
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Old 01-23-2019, 10:47 PM   #3
redmodelt
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Default Re: Bad manifold gaskets

If they came in a kit set, they would be the fiber ones. I think a lot of suppliers sell them that way. You need to get the GOOD copper faced ones, along with gland rings (google "fordbarn; gland rings). The hard fiber ones do not hold up and burn out just as you are experiencing.
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Old 01-23-2019, 10:52 PM   #4
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Default Re: Bad manifold gaskets

I had the same problem. I used Snyder's copper manfold gasket A9433-C with Permatex Ultra Copper Silicone sealant. No problems since. BTW make sure with a steel straight edge you have no warping on the manifold or the block.
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Old 01-24-2019, 12:22 AM   #5
31 Vicky
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Default Re: Bad manifold gaskets

I have had bad luck with all the manifold gaskets except the steel impregnated, waffle pattern. These last well and don't burn out.

A's Always
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Old 01-24-2019, 07:35 AM   #6
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Default Re: Bad manifold gaskets

Here's are some tips for installing the manifold gaskets:
> Take out the 2 bolts connecting the intake manifold to the exhaust manifold;
> Install the manifolds being sure to use gland rings in each exhaust port;
> Fit each ring beforehand, so it has a 0.06" end gap for expansion. The expansion gap prevents a ring from buckling, going into the exhaust pipe and winding-up in the muffler;
> Snug the manifold attachment nuts, but do not torque them to an amount that flattens the cup washers. The cup washers are actually springs that take-up thermal expansion which tends to loosen the manifold connections to the block;
> There is likely to be a gap between the intake & exhaust manifold surfaces where the bolts were removed:
o Shim the gap closed with metal sheet stock to retain the hot spot conduction heat transfer function for warmup of the intake manifold or,
o Leave the gap open and loosely install the 2 bolts connecting the manifolds so it looks correct or,
o Leave the 2 bolts out.



Running with a gap between the manifolds at the hot spot enhances performance because the fuel mixture will be cooler, thus denser. On the other hand, cold start warmup will be longer if there is a gap at the hot spot.



I have seen many cracked-out bolt tabs on intake manifolds where the 2 bolts go because of bending loads that occur when joined manifolds are clamped-up to a compressible exhaust gasket. Machining the manifolds as a set reduces the clamp-up loads, but not totally.
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Old 01-24-2019, 01:39 PM   #7
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Default Re: Bad manifold gaskets

Quote:
Originally Posted by stewgee View Post
Hello all
Can someone tell me what the best exhaust/intake gaskets are. I have had a heck of a time getting my 30 A going after installing all new gaskets from the complete set from Mac's. I just pulled the intake and exhaust manifolds and the gaskets are shot. There is signs of leakage from all ports and a portion of the rear gasket was blown away. All manifolds bolts were torqued per specs. Any thoughts would be welcomed.


I have always had great luck with the Felpro MS 2388 S, which you can order from most auto suppliers like Advance Auto. They last a long time and seal very well.
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Old 01-24-2019, 01:57 PM   #8
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Default Re: Bad manifold gaskets

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Originally Posted by 31 Vicky View Post
I have had bad luck with all the manifold gaskets except the steel impregnated, waffle pattern. These last well and don't burn out.

A's Always
Dave
Same with me. The manifolds should be surfaced unless new. Also, I use the gland rings but filing them a little to ensure the gasket seats.
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Old 01-24-2019, 08:23 PM   #9
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Default Re: Bad manifold gaskets

I will make the assumption that you are using gland rings in the four exhaust ports and the rings wonít allow the manifold to seat properly between the manifold and block causing the gasket to leak and blow out.

Remove the manifold and clean both block and manifold surfaces. Check both for depressions in the ports. Clean them out of any carbon particles, reinstall the manifold with the gland rings in place but without a gasket and snug the manifold until you feel resistance then stop. Take a feeler gauge and check the clearance between the manifold and block. If there is no clearance use the gasket of your choice. I prefer the copper ones. If you have a clearance use a gasket that is a least X2 what the feeler gauge reading is. My reason I do it this way is you donít know to what extent both surfaces have been milled in the past. PS: disconnect the muffler first.
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Old 01-25-2019, 08:15 AM   #10
john in illinois
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Default Re: Bad manifold gaskets

I am of the opinion that gland rings do not matter. I use copper 31 gaskets from A&L and have never had a failure.
Also as mentioned the surface must be flat.
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Old 01-25-2019, 11:34 AM   #11
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Default Re: Bad manifold gaskets

The gland rings are not there to prevent blow out, they are there to support the manifold to keep it from sagging. Except for a short time in 29 or 30 and just a few engines at that, all 4 cylinders up to 34 used the gland rings.



Once again I am going to repeat, most all the full engine gasket kits I have seen come with the fiber type intake/exhaust gaskets which I bet is what he is using. The better type manifold gaskets are an extra cost item.

Lots of good advice being given here.
Now if only the person that asked the question would supply an updates.
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Old 01-26-2019, 03:20 PM   #12
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Default Re: Bad manifold gaskets

Do you have the washers on right?
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Old 01-26-2019, 11:40 PM   #13
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Default Re: Bad manifold gaskets

I’m with John and Dave. I have installed hundreds of manifolds and have surface them and I no longer use gland rings for a number of reasons. Fit, pia, etc. If you have a good surfaced manifold and use the steel clad 1 piece manifold or copper set the manifold is fine anc will last for many years. The gland rings can actually cause issues on some manifolds depending on how much recess is left in them, and alignments in already warped manifolds.

Just my 2 cents with after having done mani and knowing the history of how they are doing.
Larry Shepard
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Old 01-27-2019, 11:41 AM   #14
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Default Re: Bad manifold gaskets

To sum it up - 'If the gasket fails," it's the exhaust manifold". Also, if all of the rings can't go in - It's the exhaust manifold. Not so long ago many of the manifolds were lousy, but they are really good now. And the cure is: a new one.
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