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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 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

On my 1988 Southwind the driver side is leaking and wont pass inspection. I have a 1989 P30 factory service manual but it pretty much just says to remove spark plugs, remove exhaust pipe, remove manifold bolts and plug shields, remove manifold. I'm sure it's more involved than that.

lryrob9301

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Posted: 05/13/20 02:20pm Link  |  Quote  |  Print  |  Notify Moderator

Given the age of your vehicle, every nut, bolt and screw will be rusted tight. Get lots of penetrating oil, a top quality set of drill bits, and stud and bolt extractors. You will undoubtedly run into broken bolts and fasteners when you try to loosen them. Also get a good supply of top grade nuts, bolts, and studs for replacement.


2013 Tiffin Phaeton 40QBH
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jdc1

Rescue, Ca

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Posted: 05/13/20 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

Bandaides. Plenty of bandaides for the knuckle-buster bolts.

atikovi

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Posted: 05/13/20 02:40pm Link  |  Quote  |  Print  |  Notify Moderator

Should it be hot or cold when removing the bolts?

Gjac

Milford, CT

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Posted: 05/13/20 03:11pm Link  |  Quote  |  Print  |  Notify Moderator

The best advice I can give you is don't just replace the gasket, replace the exhaust manifolds with headers. If you look very carefully the stock manifolds are probably cracked anyways. The old 454's and 460's run hot anyways and tend to crack and burn spark plug wires also. I would also replace the ign wires with Hi temp 10.4 MM wires like the Taylor Extreme wires while you are at it. Your engine will run a lot cooler and the fan clutch will come on lest often, not to mention increasing your HP between 60 and 80 HP. If you plan to do the job yourself soak the bolts every day for a week with Kroil oil and tap each bolt head each day to set up a capillary action to get the oil into the threads. If the bolts won't come out or break off, I would let a garage do it.

* This post was edited 05/13/20 03:17pm by Gjac *

theoldwizard1

SE MI

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Posted: 05/13/20 03:56pm Link  |  Quote  |  Print  |  Notify Moderator

Get a hold of Ivan at Pine Hollow Automotive in PA !

(P.S. I agree, the manifolds are likely cracked.)

atikovi

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Posted: 05/13/20 05:12pm Link  |  Quote  |  Print  |  Notify Moderator

I'm selling it so need the simplest thing that will pass inspection.

K Charles

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Posted: 05/13/20 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

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.





atikovi

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Posted: 05/13/20 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

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


I thought they were stainless steel?

atikovi

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Posted: 05/13/20 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

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?

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