How strong is JBWeld?
Thread Starter
Instructor
Joined: Jul 2002
Posts: 245
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From: Raleigh NC
How strong is JBWeld?
I've got a couple of small holes in the exhaust manifolds from the air injection stuff breaking loose. Would a bit of JBWeld be strong enough to stop that annoying ticking noise? If not, is there any simple thing I could do (aside from replacing) that would work?
Safety Car
Joined: Feb 2002
Posts: 4,286
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From: Guam
Re: How strong is JBWeld? (Enkil)
JB Weld is very strong. However, you need to clean and sand the surfaces for them to stick well. You also need to give it enough time to cure properly. The JB Kwik also works well when you are in a hurry. I used it last week in a head that had damaged threads and after curing, I drilled it , retapped it, and put the motorcycle back in service.
Melting Slicks
Joined: Dec 2000
Posts: 3,242
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From: Lexington, North Carolina
Re: How strong is JBWeld? (Enkil)
I was wondering the same thing not too long ago. I went to their website for more info. The webpage says it is good up to 500 degrees, and is not recommended for use on exhaust manifolds.
http://www.jbweld.net
Not recommended for use on manifolds, exhaust systems, and other engine components which normally operate at temperatures above 500º F.
http://www.jbweld.net
Not recommended for use on manifolds, exhaust systems, and other engine components which normally operate at temperatures above 500º F.
Drifting
Joined: Aug 2002
Posts: 1,731
Likes: 22
From: Marietta Ga.
Re: How strong is JBWeld? (robertmc48)
I have used it for all kinds of things over the years and it works well. I have to admit I always feel a little "bubba" though !!!!
Safety Car
Joined: Feb 2002
Posts: 4,286
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From: Guam
Re: How strong is JBWeld? (JohnS_77)
It says that it is not reccommended for exhaust use. But it does work.......or atleast where I have used it. If you are plugging a bung, be sure to use a little first that has time to set up and thicken before you drop it in to the hole. Otherwise, it will just run all the way in to the manifold. Then coat it generously on the outside to strengthen.
Thread Starter
Instructor
Joined: Jul 2002
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From: Raleigh NC
Re: How strong is JBWeld? (Sharky Guam)
Sounds like I'll be better off using something else. The location of the air injection tubes is only about an inch away from the heads, so I imagine gases will be a bit hotter than 500* there.
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Pro
Joined: May 1999
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From: Gabriola BC
Re: How strong is JBWeld? (Enkil)
I had a TPI camaro that pulled the threads out on the exhaust manifold when I pulled the oxy sensor. Big job to pull manifold for repair. I called JB, they said the heat range was beyond the product but might work. I put the new sensor in with JB weld and I had the car for a year and a friend has had it now for 3 years and it is still going well.
Race Director
Joined: Oct 2000
Posts: 17,102
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From: Fair Oaks, OK
Re: How strong is JBWeld? (Enkil)
I think the stuff is just an epoxy and resin more or less, which is succeptible to high heat. I don't think it would hurt anything to try it, though. I doubt it is going to cause a fire or anything like that. I bet the worst thing that could happen is it melts out in a couple weeks or something.
Safety Car
Joined: Feb 2002
Posts: 4,286
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From: Guam
Re: How strong is JBWeld? (Stoge)
:iagree: it's worth a try.....also there is a high heat epoxy made by Devcon which is used by the commercial machinists that works well but is very expensive....I would try the JB Weld first.
Drifting
Joined: May 2002
Posts: 1,546
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From: Sacramento California
Re: How strong is JBWeld? (Enkil)
I Used to use it to repair an exhaust manifold on an old 62 FIAT. It would last about two weeks and I would re do it, that was about an inch long crack that was about 1/4 inch wide in the middle. Probably spent way less than having a replacement manifold sent from Milan.
Safety Car
Joined: Jan 2001
Posts: 4,660
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From: South Central Louisiana
St. Jude Contributor
Re: How strong is JBWeld? (Stoge)
I have had good luck with JB weld, except on exhaust applications that are under pressure. When I tried it I doubt the affected area got even close to 500 degrees. It was more than likely the somewhat high pressure in between the headers and the muffler that made it fail.
Racer
Joined: Aug 2001
Posts: 457
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Re: How strong is JBWeld? (Enkil)
'Sounds like I'll be better off using something else. The location of the air injection tubes is only about an inch away from the heads, so I imagine gases will be a bit hotter than 500* there.
'
Me: Got just the stuff for this job : Its called Fireseal 2000 . Good for exhaust manifolds and will withstand up to 2000 f. Go to : http://www.por15.com and see it online . All their products are first class. Get their free catalogue.
Dave
'
Me: Got just the stuff for this job : Its called Fireseal 2000 . Good for exhaust manifolds and will withstand up to 2000 f. Go to : http://www.por15.com and see it online . All their products are first class. Get their free catalogue.
Dave
Safety Car
Joined: Mar 2000
Posts: 3,542
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From: Central Pennsylvania
Re: How strong is JBWeld? (Enkil)
I actually repaired my Quadrajet fuel intake threads with it. Manufacturer claims it can handle fuel exposure, so I tried it. IT's temporary until I get another carb bowl, and I check that connection every time I get ready to drive for integrity. No signs of loosening or leaks.
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,065
From: Virginia USA
Re: How strong is JBWeld? (ettev)
Are you still using the air holes? If not, why not drill and tap the holes and use some plugs? Before I got my ZZ4 and headers I did this with a used manifold that I picked up (original one cracked) and it worked great. IM me if you want details.
JB Weld is some strong stuff but like it is said above I won't use it in exhaust applications.
My JB weld story:
A good friend of mine had a 69 Camaro with an 11 1/2 to one compression 350 that ran like a bat out of hell. He got an Edlebrock aluminum intake for free but the only problem was it was for an ERG engine. He wanted to use it so we got some metal screen and some JB Weld and closed up the hole. It was a really trick "repair". One night we were out and he stomped on it and all hell broke loose. Big time exhaust leak...loud as hell. We thought his header fell off it was that bad......anyway we opened the hood and didn't notice anything right then. We limped home and the next day we found that our bubba repair had broken the manifold. The JB Weld held but the manifold let loose all the way around the EGR attachment point. It trashed the manifold. We never did find the JB Weld cover.
JB Weld is some strong stuff but like it is said above I won't use it in exhaust applications.
My JB weld story:
A good friend of mine had a 69 Camaro with an 11 1/2 to one compression 350 that ran like a bat out of hell. He got an Edlebrock aluminum intake for free but the only problem was it was for an ERG engine. He wanted to use it so we got some metal screen and some JB Weld and closed up the hole. It was a really trick "repair". One night we were out and he stomped on it and all hell broke loose. Big time exhaust leak...loud as hell. We thought his header fell off it was that bad......anyway we opened the hood and didn't notice anything right then. We limped home and the next day we found that our bubba repair had broken the manifold. The JB Weld held but the manifold let loose all the way around the EGR attachment point. It trashed the manifold. We never did find the JB Weld cover.