Fix exhaust manifold crack with ThermoSteel
05-06-2012, 04:06 PM
#12
JK Junkie
Originally Posted by William
With parts it's around $500, it's about 2 hours labor. If a bolt breaks it could be harder.
05-06-2012, 04:17 PM
#13
JK Enthusiast
Thread Starter
I just found the same crack on my 07. You do know it's covered under the long term warranty, 100k/7 years. They fixed it for the $100 deductible. It sounds like a problem that should be a recall, but... The original bolts back out and the vibration on the loose manifold causes the crack. They installed a re-engineered manifold and different bolts so it won't happen again. It also only happens on the driver side. So call your dealer.
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05-06-2012, 04:24 PM
#14
JK Enthusiast
Thread Starter
You can hear it. Sounds like a "puff puff puff" sound when it's running, which gets faster or slower with changes in rpm. Sometimes you can smell exhaust fumes under the hood, too.
Depending on the size of the crack, it might go away once the engine warms up because the metal expands and seals the leak.
Depending on the size of the crack, it might go away once the engine warms up because the metal expands and seals the leak.
05-07-2012, 05:14 AM
#15
JK Freak
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Originally Posted by undertow119
You can hear it. Sounds like a "puff puff puff" sound when it's running, which gets faster or slower with changes in rpm. Sometimes you can smell exhaust fumes under the hood, too.
Depending on the size of the crack, it might go away once the engine warms up because the metal expands and seals the leak.
05-07-2012, 06:43 AM
#16
JK Newbie
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Thank you very much for this idea. To anybody attempting this don't be an idiot like me and not mix the thermosteel like I should have. I had to scrape and sand all of it off and do it over, but I am now happy woth the results. I couldn't believe how quiet it is now...
05-07-2012, 09:25 AM
#17
JK Junkie
Originally Posted by tommyluv78
Puff puff puff. So it sounds like snoopdog is under my hood. OK I'll keep an ear out for it. Thanks.
05-13-2012, 03:20 PM
#18
JK Enthusiast
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I also just came across the same issue. Thought maybe the gasket bt no. Cracked manifold. So I also bought the Thermosteel. Worked pretty well. Cleaned the area really nice. Sanded it down, placed Thermosteel on it, then let it sit in the Texas sun for 2hr. Dan thing was hot. Bt it cured. I also put a lighter to it. Replaced it and BAM. Leak was fixed. Good stuff. Hasn't broken yet. I did press it into the crack and put a good 5mm think and .5" inch on either side of crack. Overall it has worked. Smokes at first. Bt good repair until there cash for a new exhaust manifold or headers.
05-17-2012, 11:49 AM
#20
JK Junkie
Originally Posted by Joeandericamoorman
is there anyway to diagnose this without removing the heat shield. thanks guys
