C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

JB welded cracked alt.

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Old Sep 3, 2008 | 09:55 PM
  #1  
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Default JB welded cracked alt.

Due to not having the rear brace on the alt., after having hooker headers that do not fit the brace, my alt casing broke. Im JB welding it until I can get a new alt.
How long do you guys think until that stuff gives? Dont worry im not leaving it like this!

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Old Sep 3, 2008 | 10:12 PM
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First start up, CRACK
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Old Sep 3, 2008 | 10:14 PM
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Same thing happened to mine for the same reason!

The JB Weld will last for many years......

if you don't mount the alternator on the car LOL.

Let us know how long it actually lasts tho, would be good to know.
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Old Sep 4, 2008 | 06:46 AM
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Im looking at it cured this morning and it feels rock solid. I just got to get it home. Its sitting at my friends house right now in the weather.

I just want it back in the garage before the hurricanes come!
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Old Sep 4, 2008 | 07:32 AM
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It might last a bit if you put a brace on it. It doesn't have to be anything fancy...........

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Old Sep 4, 2008 | 05:01 PM
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I ordered the stock brace and im going to modify it to go to the first header bolt. I saw, someone else did this and they said it was really easy and it worked. I took a look and it is very doable.
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Old Sep 4, 2008 | 05:32 PM
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I took the stock brace and cut it in two. In my junk pile I found a steel rod that fit inside the hollow brace. Place the rod inside of the brace and bolt it up. Tack weld it. Remove the brace and finish weld it. Didn't look bad and worked.
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Old Sep 6, 2008 | 04:26 PM
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So it felt pretty solid after the jb weld dried, but when I went to install the alternator it broke back off extremely easy. Well I dont trust this stuff. I jus have to wait for my remaned alt.
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Old Sep 6, 2008 | 04:28 PM
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You don't need a new alt unless you want to waste money. Go to an alt and starter rebuild shop and they will sell you just the front half for like $10. It's a common CS style peice used in many cars. Mine broke the same way. Just have remove the pulley nut with an impact gun and transfer your front bearing over to the new piece. They can do that there. It's an easy swap and JB weld will never work on this.


Last edited by 86PACER; Sep 6, 2008 at 04:46 PM.
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Old Sep 6, 2008 | 04:56 PM
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Don't do it! What happens if it breaks? I wouldn't risk it.
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Old Sep 6, 2008 | 05:08 PM
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Originally Posted by rharker
Don't do it! What happens if it breaks? I wouldn't risk it.
Read the whole thread, it already broke.

Originally Posted by cplonner
So it felt pretty solid after the jb weld dried, but when I went to install the alternator it broke back off extremely easy.
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Old Sep 6, 2008 | 09:01 PM
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Originally Posted by 86PACER
You don't need a new alt unless you want to waste money. Go to an alt and starter rebuild shop and they will sell you just the front half for like $10. It's a common CS style peice used in many cars. Mine broke the same way. Just have remove the pulley nut with an impact gun and transfer your front bearing over to the new piece. They can do that there. It's an easy swap and JB weld will never work on this.

After I get done with tommorows shift Ill take a spin by a shop I do this. This came to mind earlier but I forgot about it. Thanks for the advice
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Old Sep 10, 2008 | 10:36 AM
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I got the new part for the altenator. Cost about 18 bucks and the bearing was a different size so that was another 11 dollars. Better than buying a new alt though! Thanks for the advice!
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