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Unread 07-03-2012, 12:06 PM   #1
westt
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Cracked Exhaust Manifold

Looking for a low cost solution: Anyone try welding the crack? Or just bite the bullet and have a new one installed? Can this be done with simple hand tools? Anyone near New Philadelphia, Ohio that would want to help me wrench this?
I bought an used early 2007 fab date and I swear that it has every issue known: lifter tick - check, torque converter shudder - check and replaced under warranty, fuel burp - check (waiting for recall), windshield leak - check (waiting for rock damage).

All that being said, my wife and I still love it.

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Unread 07-03-2012, 01:21 PM   #2
CJsPerson
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I fixed mine in an hour in my driveway.

I bought my manifold at a distributor not a dealer so the price was fine, can’t remember what I paid but I remember thinking “that’s all?”
You will need several extensions or a long one and a swivel for your ratchet. The two bolts on the exhaust pipe are easier to get from the bottom. I hit all the bolts with PB blaster the day before. The repair went off without a hitch. Very easy.
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Unread 07-03-2012, 01:29 PM   #3
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When it comes to cast iron pieces I just replace them, welded cast iron is a pain and pretty much impossible in the vehicle. Once you have it out and pay the cost to weld it you've almost paid for a new one.
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Unread 07-03-2012, 03:27 PM   #4
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Quote:
Originally Posted by Coolcatracing View Post
When it comes to cast iron pieces I just replace them, welded cast iron is a pain and pretty much impossible in the vehicle. Once you have it out and pay the cost to weld it you've almost paid for a new one.
DITTO - well at least cost to weld CORRECTLY. Even on the old obsolete cast iron parts (where a new item does not exist) I would recommend lock-n-stitch over welding. Properly welding cast requires a ton of prep and a VERY good welder (man and machine) - well above average, and even then you have new stresses that must escape - usually as a crack elsewhere a few miles later.

Although I am sure you can always find someone willing to take your money and give you other hope...
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Unread 10-08-2012, 07:14 AM   #5
westt
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Is the exhaust manifold covered under federal emissions warranty???
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Unread 10-08-2012, 09:26 AM   #6
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No - only the components newly developed and added under the clean air act that control combustion are covered. Manifolds existed prior to the clean air act.
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Unread 10-08-2012, 10:15 AM   #7
Prot
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Might want to consider headers since replacing the manifold with an identical manifold may lead to the same failure.
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Unread 10-08-2012, 10:38 AM   #8
jwmbishop
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Not really - a quick trip to a machine shop for a $10.00 run through the shot blaster will relieve the stress risers and make that new manifold last almost forever!

But lacking that headers are a good choice - just a bit more underhood noise and a small amount more underhood heat.
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Unread 10-08-2012, 10:48 AM   #9
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Quote:
Originally Posted by jwmbishop View Post
No - only the components newly developed and added under the clean air act that control combustion are covered. Manifolds existed prior to the clean air act.
I don't know about that being how they figure what's covered, but here is what the JK warranty book says is covered for a longer period than the rest of the vehicle:

B. Parts Covered for 8 years or 80,000 miles
If your vehicle has one of the following parts, this
Federal Emission Warranty
covers that part for a
period of 8 years or 80,000 miles, whichever occurs first.
These limits are counted from the time when your
Basic Limited Warranty begins under 2.1(E). The
covered parts are:
catalytic converter; and
powertrain control module.
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Unread 10-08-2012, 04:05 PM   #10
Coolcatracing
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So the PCM is covered as well, did not know that.
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Unread 10-08-2012, 06:43 PM   #11
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What about JB Weld??
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Unread 10-08-2012, 07:43 PM   #12
mello
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Jb weld is a good thought however on a cast iron manifold the excessive heat will cause it to fail very quickly.
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Unread 07-08-2013, 07:43 PM   #13
herculz
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Got mine at dealership today wondering if its this. I read a lot of threads of ticking starting when they warm up, my ticks when it's cold and after it warms up ticking has vanished. Someone I bumped into mentioned his jk did same and to start jeep place in drive step on brake and give some gas, that made ticking come back hot or cold. So not sure. We will find out
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Unread 07-09-2013, 08:49 PM   #14
herculz
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Got my jk back and sure was a cracked exhaust manifold. Guess its part of warranty as I have 88k miles and paid for the extended warranty but issues before had me pay a deductible but this time bill was zero dollars.
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