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Unread 01-29-2013, 09:09 PM   #1
DoctorBill
Registered User
1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Spokane, WA
Posts: 9
Exhaust Manifold - Leaky Gasket - Fix ?

My '89 Jeep Comanche Pioneer straight six 4x4 truck has a screwed up
exhaust manifold gasket - it protrudes in the front with a leak at that point.

Here is a picture where I had stuffed Aluminum Foil into the 'crack' where
it leaks.


The foil worked quite well until the pressure blew it out !

Without removing the manifold and replacing the gasket (big bucks!),
I want to try again.

So I bought some Permatex High-Temp Red RTV Silicone in a tube.

I intent to clean out any Aluminum Foil remaining and try to stuff some
of this Silicone between the Head and the Manifold (using thin wires)
and let it set up.

Any other suggestions without doing the full head gasket replacement
(last resort!) ????

I was thinking of mixing the RTV with chopped up fiberglass, also.....

DoctorBill

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Unread 01-30-2013, 07:04 AM   #2
hillbilly51
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1988 MJ Comanche 
 
Join Date: Jul 2009
Location: georgia
Posts: 62
You can forget using the Permatex Silicone to repair a exhaust manifold leak.
The operating temperture on the silicone is about 600 degrees F., and the exhaust air temperature at that particular point is probably +1100 degrees F.....it will burn out in about 5 minutes.
It's not a big bucks job to replace a exhaust manifold gasket....a gasket costs less than $20, and it's less than a 1 hour job to replace it.
Be sure to apply some penetrating oil (PB Blaster) on the bolts (and nuts) before removing them.
Hope this helps
steve
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Unread 01-30-2013, 09:06 AM   #3
DoctorBill
Registered User
1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Spokane, WA
Posts: 9
Hillbilly - doesn't help.....
My mechanic wants more than that !

The Aluminum Foil worked until it blew out of the small slit.
If I could find something that would solidify and adhere to the
hot metal, I believe it would suffice.

But What ?
Sodium Silicate ? - Egg preservative turns to silicon dioxide.
Maybe wet the Aluminum Foil with that as I push it in.

Tell me it can't be done and I'll find a way to do it !

....and if I can't - why then I can go have it replaced !
Nothing ventured - nothing gained.

DoctorBill
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