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 > Any advice for replacing exhaust manifold gasket in a 454?

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atikovi

Suburban Washington DC

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Posted: 05/13/20 05:45pm Link  |  Quote  |  Print  |  Notify Moderator

Picture of the other side.

[image]

K Charles

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Posted: 05/13/20 06:06pm Link  |  Quote  |  Print  |  Notify Moderator

atikovi wrote:

K Charles wrote:

your selling it. Get it hot, mix up some furnace cement, or buy some pre mixed, and but it on the leak. Let it dry before starting.


For a blown gasket?


It will stop the leak.





T18skyguy

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Posted: 05/13/20 07:30pm Link  |  Quote  |  Print  |  Notify Moderator

You could try JB Weld Extreme heat. Might be worth a shot.


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Tn

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Posted: 05/14/20 01:28am Link  |  Quote  |  Print  |  Notify Moderator

The poor person that is buying it. Screwed!

Gjac

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Posted: 05/14/20 05:21am Link  |  Quote  |  Print  |  Notify Moderator

atikovi wrote:

Gjac wrote:

If you look very carefully the stock manifolds are probably cracked anyways.


I thought they were stainless steel?
. They are cast iron. The newer headers may be SS depending on make. Banks is SS. Thorleys carbon steel and ceramic coated.

opnspaces

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Posted: 05/14/20 07:55am Link  |  Quote  |  Print  |  Notify Moderator

Agreed with daily spraying them for at least a week with a penetrating oil. Even if you are going to have a shop do it you might prevent a few broken bolts and the subsequent increase in labor rate.


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atikovi

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Posted: 05/14/20 08:04am Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

They are cast iron.


I've never seen cast iron formed into tubular shapes like these, especially with that accordion section in the middle like that.

okhmbldr

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Posted: 05/14/20 08:35am Link  |  Quote  |  Print  |  Notify Moderator

Those look like stainless steel headers to me. Blow up the photo. It has several places with welds and the tubing doesn't look cast at all. Spray and soak then give them a twist. And don't try to patch with mixed up junk.

Executive

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Posted: 05/14/20 10:09am Link  |  Quote  |  Print  |  Notify Moderator

K Charles wrote:

atikovi wrote:

K Charles wrote:

your selling it. Get it hot, mix up some furnace cement, or buy some pre mixed, and but it on the leak. Let it dry before starting.


For a blown gasket?


It will stop the leak.


IMHO, Do it RIGHT or Don't do it at all. Passing along a known problem to an unsuspecting buyer is wrong on many levels. Also, given the age of the coach, whoever buys it will most likely be someone who can least afford to fix it. If you do band aid it, morally you should let that be known to the buyer.

As to changing out the gasket, yes, it's that easy. Spraying PB Blaster or penetrating oil every day for a week is solid advice. I'd spray, wait a day and try to remove them. If they don't budge, repeat. Cold or hot won't matter except for you comfort level. I'd work on it cold. You might get lucky and the bolts will spin right out. Go slow and don't try to force them or they may break. After spraying a quick rap with a hammer may help in working the penetrating oil into the bolt threads....good luck....Dennis


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mike brez

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Posted: 05/14/20 10:57am Link  |  Quote  |  Print  |  Notify Moderator

The best penetrating oil I ever used is a homemade 50/50 transmission fluid and acetone.


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 > Any advice for replacing exhaust manifold gasket in a 454?
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