Exaust Manifold

J

jhowes

Well-known member
I have two questions about the Exhaust Manifold.

1. The gasket that I have is one that has a steel face on one side. Does that face in toward the engine or out towards the manifold?

2. The nuts are brass to hold the manifold on the engine. What is the torque on brass nuts? I believe they are 3/8" NF. It must be less than the steel nuts of the same size.
Jack
 
The steel faces out and I torque the nuts down to about 35 lbs. I use a 3/8 ratchet till nice snug and then tighten if necessary.


Mike
 
Are gland rings required? I have a '29 Fordor Murray Town Sedan. When I took the exhaust (Otwell Health Heater) manifold and intake manifold off there weren't any gland rings. Did someone put it together wrong?
 
Many manifolds have sagged over the years and heat cycles and the gland rings no longer fit. If the gland rings still fit your manifold I would use them. They may prevent your manifold from sagging in the future.
 
The Gland Ring's assist in alignment and to prevent leaks. Using them along with coupler between the exhaust manifold and the muffler do help considerably in preventing exhaust leaks.

Regards
Bill
 
1930artdeco said:
The steel faces out and I torque the nuts down to about 35 lbs. I use a 3/8 ratchet till nice snug and then tighten if necessary.


Mike
Click to expand...

Start at 20 tightening evenly cold. Some don't like to go beyond 25 or 30 # on the brass nuts.
 
Last edited:
jhowes said:
I have two questions about the Exhaust Manifold.

1. The gasket that I have is one that has a steel face on one side. Does that face in toward the engine or out towards the manifold?

2. The nuts are brass to hold the manifold on the engine. What is the torque on brass nuts? I believe they are 3/8" NF. It must be less than the steel nuts of the same size.
Jack
Click to expand...

First, The nuts are were steel to begin with, not brass, and were put on to 25/30 Ft.Lbs.
 
F.M. is correct on the nuts they are 7/16 NF steel. they use pretty much the same nuts as the head. be careful if would instill the glands if the manifold does not go right on, do NOT force it. it could break the manifold. been there done that.
 
Just replaced the manifold gasket using brass nuts and antiseize with a perforated steel one piece gasket. For unlubricated 7/16 brass nuts tables give 27 lb-ft. For lubricated, advice is to reduce by 25 to 30%. We aimed for 25 lb ft and could get no further tightness and tension at anything above about 23 lb ft. Probably should not have used antiseize on the brass nuts. But it was a roadside repair of a blown gasket and we used what we had handy.
So I think for brass nuts 30 lb ft is too much.
It remains to be seen how long the gasket holds at 23 lb ft, but the blown one was in there for thousands of miles.
I think steel nuts and antiseize at 30 ft lb is probably better with a steel gasket.
The blown gasket was a 2 piece copper faced one, with 2 gland rings only. One at each end.
SAJ in NZ
 
My experience with the steel faced on one side one piece gasket doesn't last nearly as long as the copper clad on both sides two piece gaskets . In most cases the original manifold will be sagged to the point that all of the gland rings can't be used . Ford didn't advertise torque settings . I use the steel 7/16 nuts that are exactly the same as the head nuts . I don't bother with torqueing the manifold nuts . I tighten with a three eights ratchet until reasonable tight . If I used a torque wrench , I wouldn't tighten over thirty five foot pounds .
 
Purdy that is interesting. I will order a few of the copper clad 2 piece ones as spares. They certainly look better than the steel one. The failed copper one possibly failed due to insufficient torque on brass nuts. I will get some steel ones and use antiseize again next time.
We put 4 gland rings in when we did it. There were 2 at the extremities on the blown outfit. We rubbed the manifolds down to an even witness all over both surfaces on 80 grit paper on a surface plate. Found at the country shed where we did the repair. There was even a hoist there which we used to fix another car where the ring gear had moved forward on the flywheel.
SAJ in NZ
 
I think that copper clad manifold gaskets were used originally on the model A . Never hurts to have a few spares . I always use as many gland rings as possible on a used manifold . It sounds like the country shed came in handy !!!
 
Have to wonder about the origin of brass manifold nuts. The dealers sell them but I have yet to remove a manifold from an old engine that wasn't secured with steel nuts. What did Ford use at the plant?
 
ursus said:
Have to wonder about the origin of brass manifold nuts. The dealers sell them but I have yet to remove a manifold from an old engine that wasn't secured with steel nuts. What did Ford use at the plant?
Click to expand...

The Dealers will sell you anything !! "STEEL"
 
I have a '29 and the Otwell health Heater manifold doesn't line up with the tube through the firewall. See pics.

Any Ideas?????
 

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