JB Weld
#2398793
11/05/17 01:19 PM
11/05/17 01:19 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Been awhile since I've used JB weld. How long does it take for it to totally cure? Had to make an emergency repair to the driver side exhaust manifold front bolt ear on my GTS. I've held off torquing the nut until I know that stuff has totally cured.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: mopars4ever]
#2398838
11/05/17 02:25 PM
11/05/17 02:25 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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There are two types of JB weld. One is fast setting and gets hard in like 6 minutes and cures in like 5-6 hours. The other takes much longer to set like 4-6 hours and like 24 hours for full cure. I would be surprised if if holds. Just a temp fix until I can get the manifold off. Being a Bigblock the steering column needs to come out.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: dart4forte]
#2398879
11/05/17 03:26 PM
11/05/17 03:26 PM
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Joined: Jan 2008
Posts: 3,886 Lost and Spaced
bboogieart
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master
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Lost and Spaced
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I'm sure you know this. If you run it and doesn't hold, you run the risk of burning a valve.
I have mechanical Aptitude. I can screw up anything.
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Re: JB Weld
[Re: bboogieart]
#2398891
11/05/17 03:49 PM
11/05/17 03:49 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Oh yes, that I know. If it doesn't leak I'm good to go in the short term
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: bboogieart]
#2398919
11/05/17 04:52 PM
11/05/17 04:52 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Success Actually Moparpollack told me he had done a couple of manifolds and didn't have a problem
Last edited by dart4forte; 11/05/17 04:53 PM.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: dart4forte]
#2398922
11/05/17 04:55 PM
11/05/17 04:55 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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clean the area with brake kleen/let it set up 24 hrs/cross your fingers/get the "regular" type not the fast setting.
live every 24 hour block of time like it's your last day on earth
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Re: JB Weld
[Re: RapidRobert]
#2398927
11/05/17 05:08 PM
11/05/17 05:08 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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clean the area with brake kleen/let it set up 24 hrs/cross your fingers/get the "regular" type not the fast setting. What I did was use the slow acting. I cleaned the area with brake clean, let it set then applied the JB to the tab. Placed it into position, put the stud back in, tightened the nut, let it set for about ten minutes. I then backed the nut off so no pressure on the tab. This morning I removed the nut and stud, placed some sealant on the stud and installed it. Ran the nut on and torqued to spec. I'll let it set for another 24 hours to allow the sealant to set before I fill the rad and burp the motor before I fire it up. I have a buddy up in WA State that's a retired pipefitter who is expert at welding cast iron. This summer, I'll pull the manifold and get it up to him. Probably in the future when using old cast iron manifolds and other parts is to have them magged to insure there's no cracks. As clean as that break was I'm sure there was a hairline crack.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: dart4forte]
#2399038
11/05/17 08:53 PM
11/05/17 08:53 PM
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Joined: Dec 2014
Posts: 5,833 ohio
ruderunner
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master
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ohio
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Your welder buddy is going to hate you. You just packed the crack with contamination that can't be removed without further destruction.
Angry white pureblood male
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Re: JB Weld
[Re: ruderunner]
#2399083
11/05/17 10:14 PM
11/05/17 10:14 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Your welder buddy is going to hate you. You just packed the crack with contamination that can't be removed without further destruction. Yeah, but I had to do it. It was either that or let the car sit for 9 months
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: poorboy]
#2399170
11/06/17 02:23 AM
11/06/17 02:23 AM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Yes, I know. I've welded cast iron before. Clean parts is a must. We will see how long this lasts. The JB weld which is darker than the cast iron shouldn't be difficult to grind off.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: JB Weld
[Re: 360view]
#2399242
11/06/17 10:47 AM
11/06/17 10:47 AM
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Joined: Jan 2003
Posts: 43,558 Round Lake Beach, Illinoisy
Rhinodart
Rhinotruck
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Rhinotruck
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Posts: 43,558
Round Lake Beach, Illinoisy
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My original block for my 383 GTS had cracked by the lifter galleys inside. The block was brazed after being heated up then pressure tested afterwards, no issues! This was back in 1979.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
JB Rhinehart, Realist
A-Body's RULE!
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Re: JB Weld
[Re: 62maxwgn]
#2399344
11/06/17 02:01 PM
11/06/17 02:01 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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^^^ what is the smallest quantity of it available! 2.2 lbs would last forever.
live every 24 hour block of time like it's your last day on earth
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Re: JB Weld
[Re: RapidRobert]
#2399407
11/06/17 03:42 PM
11/06/17 03:42 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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They sell it in kits and the 1 kilogram package is as small as it gets.
I've been using Belzona in an industrial setting since 1982. It is an industrial product for industrial use. With the material you can usually get an in-plant demonstration by a tech rep, and training for the people who will be applying it.. The early '80s price, IIRC, was $165 per kit.
Belzona is not intended for hobbyist use.
R.
PS: That old wives' tale about "warping the valves" is just that, a tale. It's not true. It probably came from someone overthinking the situation. I have heard it since I began to be interested in cars in the '60s. As a youth I helped haul grain from the field and augur it into bins. Our grain augur had a Wisconsin AGND single cylinder gas engine. After a couple of years of use the muffler burnt off. I remember many a dark night as I unloaded the last truck of the day, standing directly behind the exhaust port and looking at the exhaust valve at yellow heat. There was about an inch between the edge of the block and the exhaust valve. Year after year the muffler didn't get replaced and I can attest that the engine compression was as strong as ever. No warped valve for this engine!
Last edited by dogdays; 11/06/17 04:10 PM.
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Re: JB Weld
[Re: dogdays]
#2399443
11/06/17 05:10 PM
11/06/17 05:10 PM
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Joined: Feb 2003
Posts: 16,148 Mesa, Arizona
dart4forte
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Well fellas, went out and fired up the car, big time exhaust leak. Snugged the nut and the JB gave way. Ended up taking the manifold off. It appeared the JB never set up. It was soft. Not sure if it was old or I didn't mix properly. Wire wheeled the tab and manifold. All the JB came off. The tab still fits. Needs some more cleaning with brake clean. Anyway, have to find someone that can do the repair.
“So if it’s on the internet it must be true”
Abe Lincoln
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