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Topic Review (Newest First)
01-10-2013 08:44 AM
tonysaprano Hey scgeek12, It's been awhile since the last post but I just have to know, How did you get to the manifold crack ? reaching down or from the bottom ? Did you remove the intake box? Hope your still around to answer..Thanks
05-30-2011 08:14 PM
scgeek12 well it looks like 450 is the magic number, about 450 miles on the original thermosteel i put on it and it is starting to leak a little bit again, not to bad lasted MUCH longer than JB weld lol, $8 = 450 miles, pretty good if you plan on replacing the header anyway!
05-21-2011 01:07 AM
scgeek12 well im right around 250miles on most of the thermosteel and it is holding up well, except the larger crack is starting to come back, but i did not use the wire mesh like i should have, ive moved fixing the exhaust up to my next project, found out a "friend of a friend" works at autozone and will get me a discount so im going to be putting in a new header / downpipe and upgrading my flowmaster 40 series to a delta 44, but as for the thermosteel it definetly works well for smaller cracks it is still perfect there, but the larger cracks that require the mesh i can not vouch for, im sure it works well but im going to be replacing it all in 1 week so not going to bother trying it lol, will keep updating how it holds up on the smaller ones untill i get it changed tho!
05-21-2011 12:52 AM
00silverTJ
Quote:
Originally Posted by scgeek12 View Post
lol sorry i thought he was pretty cool
It is kind of cool, but when it is in your own thread and you end up posting all the time, it is like a blinking flourescent tube. I thought I was going to have a seizure... lol

All good.
05-20-2011 05:55 PM
Shelby427 Nice temp fix, and great diagnosis on it blowing loose on the one crack.
True jeepmanship at work.


Now where's my dancing Kool-Aid guy smiley at?
05-20-2011 03:25 PM
scgeek12 ya im going to bite the bullet and get some stuff at autozone in about a month lol, turns out a "friend of a friend" works there so discount getting the header / collector there as well as a new belt since im going to have it loose / off anyway, figure its a good time to upgrade from my flowmaster 40 series to a delta 44
05-20-2011 08:38 AM
dan188 scgeek - thanks for all of your feedback. It sounds like this thermo-seal might work as a good temporary solution until a replacement manifold can be installed... In my case, last year I replaced my manifold with this one from Quadratec:

Rugged Ridge 17660.01 - Rugged Ridge Raw Steel Header Assembly for 91-99 Jeep® Wrangler YJ, TJ & Cherokee XJ with 4.0L Engine - Quadratec

It's already cracked at the rear collector. I wouldn't recommend this header in raw steel, but maybe the stainless is better... anyway, again, thanks for your input!
05-19-2011 04:53 PM
scgeek12 well the thermosteel on the larger crack failed (the one i found with the mirror), i think it was due to the size of it and not using the wire mesh stuff the other one comes with, pretty sure the exhaust gasses pushed there way out when it was baking on, just put some more on (had some left over) but used a blow torch to heat it up slowly this time, waited 30minutes then idled it for 10minutes, not leaking anymore, torch makes more sense then running it anyway so if anyone does try this, use a torch if you have one to heat it up after the 4 hour cure time, then wait 30minutes-1 hour and THEN idle it for 10minutes
05-19-2011 12:18 PM
scgeek12
Quote:
Originally Posted by 00silverTJ View Post
ahh, Thats better. it was driving me nuts!

Thanks
lol sorry i thought he was pretty cool
05-19-2011 06:36 AM
00silverTJ
Quote:
Originally Posted by scgeek12 View Post
you dont like my dancing koolaid guy? how about this one lol
ahh, Thats better. it was driving me nuts!

Thanks
05-18-2011 10:59 PM
scgeek12
Quote:
Originally Posted by rrich View Post
That stuff is certainly worth a try.

Probably similar to the famous "muffler bandage." I've seen those last for years, and for only a few minutes.
ive got about 120 miles on the first thermosteel i applied and it is holding like a champ
05-18-2011 10:58 PM
scgeek12
Quote:
Originally Posted by 00silverTJ View Post
I've got two dollars towards a forum fund to bribe sceek12 to delete the dancing kooloaid dude in his signature. If that doesn't work I am going to have to disable signatures or stop visiting this thread.

Best of luck to you on your repair sceek12!
you dont like my dancing koolaid guy? how about this one lol
05-18-2011 09:46 PM
rrich That stuff is certainly worth a try.

Probably similar to the famous "muffler bandage." I've seen those last for years, and for only a few minutes.
05-18-2011 08:26 PM
00silverTJ I've got two dollars towards a forum fund to bribe sceek12 to delete the dancing kooloaid dude in his signature. If that doesn't work I am going to have to disable signatures or stop visiting this thread.

Best of luck to you on your repair sceek12!
05-18-2011 07:23 PM
scgeek12 just got to work and checked on it, doing well so far, even the black paint on the exhaust tip is holding up perfect
05-18-2011 05:59 PM
scgeek12 awsome, good to know thank you! was kind of worried due to it also being one of the cheaper ones out there, anyways as for the thermosteel- just went out and let it run for 10minutes to "bake" it on to the header per the instructions on the back, it sounds SOOOO much better, i must have missed another small crack as there is still a faint leak but as for what i covered, it may not be pretty but it is sure working i put it on a little bit heavy in some spots, heres a couple crappy pics after the 10minute bake,

heres the big one i found with the mirrior, not a good pic sorry



if your going to try this (so far i would highly recommend) its pretty easy-

tools needed:
-themosteel
-drill / (i used a 5/32 bit) to stop drill as many as you can
-wire brush
-alcohol or other cleaning solvent
-rags

start by cleaning it up as much as you can with the alcohol or other solvent and the wire brush and a rag or 2, this will help to find smaller cracks that you might miss (like i did at first) then stop drill them as best as you can, after that i would clean it up again as best as you can with the alcohol, wire brush , and rags,then take the thermosteel and mix it up very well, should be about the consistency or wet sand, if that makes sense lol, then just use your finger and apply it to the cracks, if you have cracks larger than about 1/8 they sell thermosteel with a wire mesh square in it to use, then let it sit for 3-4 hours, i let it sit for 3 hours 45minutes, then run the jeep for 10minutes while watching to make sure it doesnt start to bubble (if it does your heating it up to fast turn it off for a few minutes) after running it for 10minutes let it sit for atleast 30minutes, then your good to go

keep in mind this is a temp repair and the header should be replaced ASAP, i will keep this updated on how it works out
05-18-2011 05:29 PM
freeskier
Quote:
Originally Posted by scgeek12 View Post
i dont think it will be stronger than an actual weld, when i had the muffler shop weld up the cracks they were not stop drilled first, and continued to crack and basically the welds "fell/broke" off, i stop drilled as many of the cracks as i could get to, i am going to replace the header in about 2.5 months, looking at this one Original Replacement Parts 4883385K - Exhaust Manifold Kit for 97-99 Jeep® Wrangler TJ, 91-95 Wrangler YJ, 91-99 Jeep® Cherokee XJ & 93-98 Grand Cherokee ZJ with 4.0L 6 Cylinder Engine - Quadratec , will have to check out that downpipe at autozone, thats a pretty good price even tho i HATE autozone lol, perhaps oreillys will have one as well, thanks for the suggestion!


also the shop couldnt get to a few of the cracks with the welder without removing the header, so it was still leaking pretty bad, i was able to get my finger back there with the thermosteel and seal them up
Yep, that the same style header I have. I'm pretty sure this was one of the first thing my dad had to do when he bought my Jeep back in 2001, so I'd say it's a good 9 years old and it hasn't cracked.
05-18-2011 05:24 PM
scgeek12
Quote:
Originally Posted by freeskier View Post
Anything but a two piece header design, or the flex joints is an absolute waste of time and money. The absolute best exhaust header is the OEM two piece one, however I have a header with the flex joints and it has been going strong for a long time.

I also find it extremely hard to believe any kind of paste is going to be stronger than a weld. The problem is expansion and movement of the engine. Unlike a V-6 or V-8 that has two shorter headers on each side, the inline engine has one very long header that cracks because of repeated heating and cooling cycles and movement of the engine.

This problem was resolved in the later model jeeps by using a two piece header.
i dont think it will be stronger than an actual weld, when i had the muffler shop weld up the cracks they were not stop drilled first, and continued to crack and basically the welds "fell/broke" off, i stop drilled as many of the cracks as i could get to, i am going to replace the header in about 2.5 months, looking at this one Original Replacement Parts 4883385K - Exhaust Manifold Kit for 97-99 Jeep® Wrangler TJ, 91-95 Wrangler YJ, 91-99 Jeep® Cherokee XJ & 93-98 Grand Cherokee ZJ with 4.0L 6 Cylinder Engine - Quadratec , will have to check out that downpipe at autozone, thats a pretty good price even tho i HATE autozone lol, perhaps oreillys will have one as well, thanks for the suggestion!


also the shop couldnt get to a few of the cracks with the welder without removing the header, so it was still leaking pretty bad, i was able to get my finger back there with the thermosteel and seal them up
05-18-2011 05:19 PM
freeskier Anything but a two piece header design, or the flex joints is an absolute waste of time and money. The absolute best exhaust header is the OEM two piece one, however I have a header with the flex joints and it has been going strong for a long time.

I also find it extremely hard to believe any kind of paste is going to be stronger than a weld. The problem is expansion and movement of the engine. Unlike a V-6 or V-8 that has two shorter headers on each side, the inline engine has one very long header that cracks because of repeated heating and cooling cycles and movement of the engine.

This problem was resolved in the later model jeeps by using a two piece header.
05-18-2011 05:10 PM
just4fun Autozone sells walker exhaust parts and mufflers. The down pipe that hooks to the header to the cat is $72. I was just looking at replacing my cat and the down pipe on my jeep that's why I know what autozone has not that im a big fan of them
05-18-2011 04:38 PM
scgeek12 well just finished the last coat on the tip, will see if it just burns off on the way to work lol, not sure if 500F will be enough (dont think it gets that hot)

05-18-2011 01:55 PM
scgeek12 totally forgot to take pics of it going on sorry pretty out of it this morning lol took way to much allergy medicine last night, will say that you should use a mirror to find all the cracks before you use it, i found that one of the cracks i filled continues around the pipe on the back where i could not see it, made it pretty hard to get to had to grind off that filler i had put on already (not to bad) just to be able to get around it, it was about 4" long and the widest part was about 1/8th of an inch, also found some black 500F high heat paint in my closet from a while back so im painting my rusty exhaust tip since it looks horrible, not sure if it will work but cant be worse than it is now lol, now i just have to wait 3.5 hours to go out and slowly heat up the exhaust for 10-15min then let it harden

heres a pic of the before on the exhaust tip, will have an after ina few hours
05-18-2011 12:58 PM
scgeek12
Quote:
Originally Posted by just4fun View Post
Autozone has the down pipe that hooks to the cat also
how much? i dont buy anything from autozone but if they have it perhaps oreillys will too, prolly a lot cheaper to get it at the junk yard tho, but if it is a good price then new would be a lot better
05-18-2011 07:10 AM
just4fun Autozone has the down pipe that hooks to the cat also
05-17-2011 10:29 PM
scgeek12 theres a nice one on quadratec for like 160 im looking at but the PO welded the header to the downpipe (no collector) so im going to have to hit the junkyard to cut out a section with a collector and have a shop weld it in, nearest junkyard with TJ's is about 2.5 hours away (that i know of) and first things first im getting rid of these dang driveshaft vibes with a SYE / DS lol saving up for it right now should have enough in a month
05-17-2011 07:28 PM
just4fun Autozone has a replacement one for $188. And it looks like the same replacement header that's on my jeep
05-17-2011 07:22 PM
scgeek12
Quote:
Originally Posted by s3nt3nc3d View Post
Are you doing these repairs on a muffler or a manifold? If a manifold...I'd recommend fixing it RIGHT rather than rigging up fixes. My buddy had a truck in the shop the other day...had a cracked manifold. The owner tried fixing it with JB Weld and other similar products like you are recommending here. He finally took it in to have it replaced after many months.

My buddy got the new manifold and gasket swapped over... still leaks like a sonofabitch. The reason? His rig jobs only made the leaks smaller but they were still there and the hot exhaust gases actually ate away a chunk out of the head.

So now the guy is being billed for a new head (unless they're able to machine it down to where it's still usable--no idea if that can be done, I'm not a mechanic...lol).

All because he kept putting off fixing his initial problem...

My $.02. If it's just a cracked muffler...have at it.
Its for the header and nobody is recommending JB weld we are saying we already used it and it did not work, and as previously stated this is a temp repair
05-17-2011 07:04 PM
s3nt3nc3d Are you doing these repairs on a muffler or a manifold? If a manifold...I'd recommend fixing it RIGHT rather than rigging up fixes. My buddy had a truck in the shop the other day...had a cracked manifold. The owner tried fixing it with JB Weld and other similar products like you are recommending here. He finally took it in to have it replaced after many months.

My buddy got the new manifold and gasket swapped over... still leaks like a sonofabitch. The reason? His rig jobs only made the leaks smaller but they were still there and the hot exhaust gases actually ate away a chunk out of the head.

So now the guy is being billed for a new head (unless they're able to machine it down to where it's still usable--no idea if that can be done, I'm not a mechanic...lol).

All because he kept putting off fixing his initial problem...

My $.02. If it's just a cracked muffler...have at it.
05-17-2011 06:59 PM
scgeek12 well so far so good lol drove it around doing some errands and to the car wash today, and now im at work and it is still holding up, id say 100miles on it now


i tried jbweld too lol a few different kinds they all melted off within minutes
05-17-2011 06:27 PM
dan188 I'm also interested... I replaced my stock manifold with a basic steel tube header about a year ago, and sure enough the after market header cracked about a month ago... Before I replaced my stock manifold I tried to use JB weld and that was a disaster. DO NOT try that. The JB weld caught on fire and the smoke was awful.

scgeek - I hope this thermoseal works for you. I really don't feel like replacing my header again until I can afford to buy a nice stainless one.
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