Cracked exhaust manifold - JeepForum.com

 
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post #1 of 8 Old 09-13-2012, 03:39 PM Thread Starter
Glavus
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1999 XJ Cherokee 
 
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Cracked exhaust manifold



So I decided to look for things to fix on my Jeep as does every XJ owner, and to my surprise I found a crack in the exhaust manifold. I'm not really sure if it's a huge deal but could anyone tell me the severity of this? Leave it alone or fix it? I mean I don't really notice anything, I feel a ticking in the valve cover but other than that I don't suspect a thing out of the ordinary. Do cracked exhaust manifolds have any tell tale symptoms?

Thanks guys

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post #2 of 8 Old 09-14-2012, 02:39 AM
misterdent
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It can cause your jeep to use more fuel and lower your mpg. It will pull fresh air in through crack causing your o2 sensor to think it is running too lean. Extra Gas = less money for jeeping!
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post #3 of 8 Old 09-14-2012, 08:04 AM
CRider74
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Had that happen with my 93 Wrangler, noticed it when I was replacing the motor. I put a header in and never regretted it.

Smokin' & Jeepin' (Finally!!!)
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post #4 of 8 Old 09-14-2012, 02:23 PM
Whizzerbike
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If you got yourself a welder, just pull the header off and weld it back together along with all the other joints for extra support.
Will run like new if done right.

She thinks my JEEP is SEXY!
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post #5 of 8 Old 09-15-2012, 06:48 PM
98muddyjeep
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Quote:
Originally Posted by Whizzerbike
If you got yourself a welder, just pull the header off and weld it back together along with all the other joints for extra support.
Will run like new if done right.
And then watch it crack in five other places,I have welded my header (seven cracks in all) and now have five more.best to buy a aftermarket namebrand header with a warranty and be done with the problem.

ah,beer the cause of and cure to all of lifes problems ...Homer J Simpson... I am the guy in the red jeep!
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post #6 of 8 Old 09-15-2012, 07:51 PM
Motorcharge
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Buy a header and a new head gasket set, pull the head and manifolds as one piece. The exhaust is infinitely easier to remove with the entire cylinder head out and it only takes a couple hours to pull the whole thing, change the gasket, and put everything back. Might as well get it all clean and new gaskets in while you're at it.

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Quote:
Originally Posted by Ron Swanson
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post #7 of 8 Old 09-16-2012, 12:39 AM
rugsucka
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I have a slightly cracked header flange where it meets my down pipe. I wouldn't pull my head and replace it unless I was swapping in an upgrade for the 0331 time bomb.

That being said, I will continue to goop muffler cement until I can gather parts to do that exactly - pull the head, install new manifold on new head, put back in as one unit.
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post #8 of 8 Old 09-16-2012, 08:13 AM
Motorcharge
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It's less work imo to just pull the whole damn thing. You figure 10 years and 100K miles, it can't really hurt to go ahead and replace the head gaskets while you're at it. Esp on a 00-01.

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Quote:
Originally Posted by Ron Swanson
There is no such thing as bad weather. Only inadequate clothing and transportation.
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