Intake/Exhaust Gasket Question

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willy3

NAXJA Forum User

Location

Cashiers, NC

• Sep 11, 2004

• #1

I have a 91 XJ 4.0 with a 99 intakemanifold. When I first installed the intake I just used the same gasket with silicone sealer as I did not take the exhaust manifold off. I am now going to put a header on and will get a new gasket. I noticed that there are different gasket part #s listed at Autozone and NAPA for 91 and 99. Which should I use or does it matter?

 

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Lonestar

NAXJA Forum User

Location

west bountiful utah

• Sep 11, 2004

• #2

If i remember right the ports are a little different. At least they are between my 87 xj 4.0 non HO andmy sisters 91 yj 4.0 HO. BTW the gasket doesnt need any sealant on it.

 

OT

NAXJA Forum User

Location

Jensen, UT

• Sep 11, 2004

• #3

Personally, I swear by permatex copper spray, as do many others. Much safer than silicone, won't degrade and seals imperfections.

 

old_man

NAXJA Forum User

Location

Loveland, Colorado

• Sep 11, 2004

• #4

Permatex CopperCote is the best way to go. You really have to be careful with silicones. Using many on the intake can kill your O2 sensors. Thats why you should always look for the Sensor Safe label on your sealers. Even the high temp silicones will fail on an exhaust.

 

Yucca-Man

NAXJA Member # 683

Location

Castle Rock, CO

• Sep 11, 2004

• #5

I'll second Tom's CopperCote recommendation. There was just enough left in the can he lent me to coat my gasket, and so far (knock on wood) no leaks....of course with my luck I've just condemned it.

 

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willy3

NAXJA Forum User

Location

Cashiers, NC

• Sep 11, 2004

• #6

Yes; but should I use the 91 or 99 gasket?