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Cracked exhaust manifold

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Old Dec 21, 2018 | 08:56 AM
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Default Cracked exhaust manifold


Is it repairable

Last edited by ralphspears; Dec 21, 2018 at 08:57 AM.
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Old Dec 21, 2018 | 09:53 AM
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Per photo, Yes. Find an experienced weld shop; ask if they can weld Cast Iron
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Old Dec 21, 2018 | 11:09 AM
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Unless it was something special I would just replace it. Actually I'd try welding it myself just for fun first.

Last edited by carriljc; Dec 21, 2018 at 11:10 AM.
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Old Dec 21, 2018 | 01:18 PM
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It is a 3932461 right side with the holes for AIR tubes
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Old Dec 24, 2018 | 01:30 PM
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It's tough to weld cast............
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Old Dec 24, 2018 | 03:28 PM
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I was successful using silicone bronze rod and then peening it as it cooled to stop it from cracking. Also did the V cut and pre heat red.
I would go with the post above and find a good shop that does ALL kind of welding.

Dom
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Old Dec 24, 2018 | 03:41 PM
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Originally Posted by ralphspears
It is a 3932461 right side with the holes for AIR tubes
Yup. Gutter side. Changed a whole fleet of 8 work trucks in the 70's. When they are hot and gutter water splashes up, crack.
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Old Dec 25, 2018 | 08:09 AM
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Ralph,

Send it to Dominic.

Steve
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Old Dec 25, 2018 | 10:51 AM
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Take it to a welding shop but get a quote first! These are expensive to replace and most have hair line cracks,but they are out there for full replacement
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Old Dec 25, 2018 | 02:16 PM
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If it is not leaking exhaust, reinstall it. Welding cast can seal a leak. Won't make it stronger like welding steel.
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Old Dec 25, 2018 | 02:51 PM
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Now somebody wants to buy it like it is the AIR tube holes are all fine except one has a fitting broken off in it. What is it worth like it is ?
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Old Dec 25, 2018 | 03:09 PM
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Nickel rod will do fine without too much hassle. But if it's not leaking I'd just leave it. And if it was I'd probably get another. A welded up original isn't worth anything...so no worse than a nice repro.

JIM

Last edited by 427Hotrod; Dec 25, 2018 at 03:10 PM.
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Old Dec 26, 2018 | 03:18 AM
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Jim,
I like nickle rod. I did ARC welding with that rod on Ford stamping plants cast. We put the cast in a GIANT oven till it was red and then tried not to get heated up. Was easy because of the midwest temp in he winter , or a fan in the summer. But the peening was necessary.

Dom
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Old Dec 26, 2018 | 06:35 PM
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I use Muggy Weld and it works.

Can be done with a torch also....because I have repaired cracks in manifolds JUST LIKE what your looks like and it holds.


DUB

Last edited by DUB; Dec 26, 2018 at 06:37 PM.
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