Quick Fix for Cracked Exhausted Manifold? - JeepForum.com

 
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post #1 of 13 Old 07-25-2004, 06:57 PM Thread Starter
Wahiya
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Question Quick Fix for Cracked Exhausted Manifold?

Is there is a quick fix for a cracked exhaust manifold?

Just found the crack on the downpipe.

Can I weld? Should I replace? How about wrapping it muffler tape temporary?

Thanks!


89 Cherokee - Stock - I6- 5 Speed
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post #2 of 13 Old 07-25-2004, 07:01 PM
cfkingfish
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If it is on the manifold, I consider a weld to be just a temporary solution - it will probably crack again due to the pressure. If it is on the headpipe, you can probably get away with a plug weld. Your best bet on the manifold is to replace with headers, or turn the music up.

Christian
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post #3 of 13 Old 07-25-2004, 07:04 PM Thread Starter
Wahiya
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Turn up the music!

Can't stand the smell coming into the cab...

89 Cherokee - Stock - I6- 5 Speed
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post #4 of 13 Old 07-26-2004, 10:59 AM
denverd0n
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A cracked manifold should be replaced. For the short term, in the meantime, you can use JB Weld to close it up.
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post #5 of 13 Old 07-26-2004, 11:03 AM
DefaZ
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Quote:
Originally Posted by denverd0n
A cracked manifold should be replaced. For the short term, in the meantime, you can use JB Weld to close it up.
I tried JB weld and a couple other muffler-patch cremes, but they all burnt off and smelled like hell.

I ended up just ordering a replacement grade manifold off ebay...
$140 got me the manifold (with lifetime warranty) and gaskets shipped...

If it breaks, I live about 15 miles to the distributor, and will throw it through their window. then yell. then fart and run.
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post #6 of 13 Old 07-26-2004, 12:37 PM
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so wait...are you going to fart and run at the same time, or fart then run?

'91 XJ Laredo
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post #7 of 13 Old 07-26-2004, 12:45 PM
MGrobe
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If the crack is accessible enough, I would weld it. You can then plan for a better fix later after you decide how long this XJ is going to be part of your life. If she is a keeper, then upgrading to a permanent solution via an aftermarket header should give you the best chance of failure proofing. When I replaced my header, it was a pain in the rear to get everything retorqued down. Wouldn't want to do that again if at all avoidable.

Otherwise it would be a shame to invest a lot of time and money into a vehicle that might only be in your possession another year or two.
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post #8 of 13 Old 07-26-2004, 02:46 PM
bryes
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Summit racing sells heat tape that is made to wrap headers for insulation. It might be a cheap/easy alternative to replacing if the cracks are in a good position.
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post #9 of 13 Old 07-27-2004, 12:40 AM Thread Starter
Wahiya
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Thanks everyone for the replies!!!!!

This XJ has truely been a learning experience! LOL

89 Cherokee - Stock - I6- 5 Speed
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post #10 of 13 Old 07-27-2004, 01:17 AM
JVracer04
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Quote:
Originally Posted by DefaZ

If it breaks, I live about 15 miles to the distributor, and will throw it through their window. then yell. then fart and run.

...*breath*

1997 Jeep Cherokee... 8" Long arm Lift - still waiting to put it on
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post #11 of 13 Old 07-27-2004, 01:19 AM
ZmOz
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Why bother? A little crack won't hurt anything. Mine's cracked and I couldn't care less...
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post #12 of 13 Old 07-27-2004, 02:29 AM
JVracer04
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thats not true from what ive heard... a cracked header will cause a loss of back pressure and ive heard these I-6's are dependant on backpressure

yah it will still run fine, but not at its peak, and long term damage (extreme carbon build ups from the exhaust leaking onto your intake manifold) is always fun

1997 Jeep Cherokee... 8" Long arm Lift - still waiting to put it on
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post #13 of 13 Old 07-27-2004, 11:49 AM
ZmOz
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Quote:
Originally Posted by JVracer04
thats not true from what ive heard... a cracked header will cause a loss of back pressure and ive heard these I-6's are dependant on backpressure

yah it will still run fine, but not at its peak, and long term damage (extreme carbon build ups from the exhaust leaking onto your intake manifold) is always fun

Unless the crack is HUGE, and big enough to make your jeep sound like a garbage truck, it is NOT a problem at all. The loss of back pressure will be very minimal and that will be GOOD for your engine. Carbon buildup will be almost non existant....
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