How do you know if you have a cracked exhaust manifold? - JeepForum.com

 
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post #1 of 8 Old 10-23-2003, 10:16 AM Thread Starter
wrangler2002
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How do you know if you have a cracked exhaust manifold?

Except for the wierd noise I here at high RPMs, can I do a visual check. Do I have to remove the intake manifold to get a complete view?

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post #2 of 8 Old 10-23-2003, 10:40 AM
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Normally you can see the cracks (if their is one) with a good flash light and maybe a mirror. I find most of the cracks around the collector (where the 2 pipes come together above the flange at the bottom of the header). It will crack around the welds. Also check around the rear 5 and 6 cylinder tubes. Some will aslo crack at the bellows (if installed) off cylinder 1-2.
It's best to view from the drivers side and or under side of the engine.
With some cracks, the sound is more apparent when cold then when hot. This is due to heat expansion.

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post #3 of 8 Old 10-23-2003, 10:59 AM Thread Starter
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Thanks. .
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post #4 of 8 Old 10-24-2003, 12:13 AM
RckyMtnTJ
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When mine went I noticed the noise.. When I looked under the Jeep (under where your feet are when driving) I fount where the two collectors combine to become one, I could see black soot where the crack was.. Here's a pic:


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post #5 of 8 Old 10-24-2003, 04:16 PM
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It may be hard to notice especially if you run mud and the headers are caked. One trick to spot a leak is to go out at night and start it up and look in the vicinity that RckyMtnTJ posted in the diagram with a flashlight.

Here's the real deal so you can kinda see what you are looking for:



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post #6 of 8 Old 10-31-2003, 07:59 AM Thread Starter
wrangler2002
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Quote:
Originally Posted by SniperFire
It may be hard to notice especially if you run mud and the headers are caked. One trick to spot a leak is to go out at night and start it up and look in the vicinity that RckyMtnTJ posted in the diagram with a flashlight.

Here's the real deal so you can kinda see what you are looking for:



Regards,
SniperFire
http://www.darksiderz.co.uk
I don't get it, I don't see any cracks.
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post #7 of 8 Old 10-31-2003, 10:52 AM
SniperFire
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Maybe you oughta take two flashlights

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post #8 of 8 Old 11-04-2003, 08:27 AM Thread Starter
wrangler2002
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Quote:
Originally Posted by SniperFire
Maybe you oughta take two flashlights

good point, maybe i should use two flashlights
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