149 Inlet & exhaust manifold - hotbox

Engine discussion.

149 Inlet & exhaust manifold - hotbox

by NSWEH225M » Sun Jun 05, 2016 7:32 pm

I'm putting back together my 149 inlet and exhaust manifold assembly.

In between the 2 manifolds ( hot box area) there is a metal spacer. see photo.

Q. Why is there only 1 gasket used to seal this area ?

I would of thought you'd need 2 gaskets , one each side of the metal spacer.
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manifold spacer.jpg
manifold spacer.jpg (65.81 KiB) Viewed 4350 times
hot box gasket.jpg
hot box gasket.jpg (26.78 KiB) Viewed 4350 times
 
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Re: 149 Inlet & exhaust manifold - hotbox

by Harv » Mon Jun 06, 2016 7:35 am

Interesting. The MasterParts reckons there is only one gasket (7401133) for the plate (7425872) too.

Cheers,
Harv
 
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Re: 149 Inlet & exhaust manifold - hotbox

by NSWEH225M » Mon Jun 06, 2016 8:07 am

Thanks Harv,

I'll just go with one gasket.

I can see the remnants of the gasket on one side only on the metal spacer, so I'm going to assume it goes on that side.
 
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Re: 149 Inlet & exhaust manifold - hotbox

by Carpet56 » Thu Jun 13, 2019 3:51 pm

I too am putting my manifolds together after painting for my 179 and i had the same question regarding the one gasket. I am wondering if i could use some sort of muffler putty or the like on the bottom of the plate to prevent any leaks. Mine looked like it had been leaking for a while when i got the car.
Regards Glenn
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Re: 149 Inlet & exhaust manifold - hotbox

by claysummers » Wed Jul 10, 2019 11:13 am

I may stand corrected here but I’ve found good ol’ household grade silicone sealant is great for sealing exhausts, although not compatible with catalytic converter engines. It has a very high heat tolerance. Otherwise Gasket Goo would be my go to.
Cheers
Clay
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