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Old 01-14-2007, 12:48 PM   #1
Lemon Head
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Default Can a Cast Iron Exhaust Manifold be Welded

I have an older Volvo AQ 125 A - 4cyl with a crack in the exhaust manifold from our old boat. Is cast Iron weldable?? It is a hairline crack leaking raw water about 2-3 inches long. Any help would be great. Thanks - LH

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Old 01-14-2007, 01:10 PM   #2
MattPark
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Default Re: Can a Cast Iron Exhaust Manifold be Welded

Yes, any welding shop should be able to do it. I've welded turbocharger housings (same deal but usually they get hotter) with similar cracks and have yet to have one fail (now that I say that...I need to find a piece of wood).

I've ground out the crack, heated the part to 500 or so, welded it with high nickel rod, then stuck the part in sand or kitty litter so that it cools s l o w l y. If it cools too fast it will crack. Even putting it back in the oven and slowly turning down the heat works.

That said, are you sure you can't find a replacement part?
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Old 01-15-2007, 08:44 AM   #3
Herring Problem
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Default Re: Can a Cast Iron Exhaust Manifold be Welded

You can get this welded, but if the outside wall has a crack, you need a good shop that can repair the inside wall allso. Theses have an interior wall separating the water / ehaust wall inside. Have it checked out really well before paying for a weld job that may not work.
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Old 01-16-2007, 09:12 AM   #4
chucks electric
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Default Re: Can a Cast Iron Exhaust Manifold be Welded

hello, dont weld exhaust manifolds they crack on the inside as well as getting way to thin to weld. bad manifolds are engine killers. contact cook engine on hayden island in portland and replace the manifold. anyway manifolds are a wear item and need to be replaced.
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Old 01-16-2007, 07:10 PM   #5
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Default Re: Can a Cast Iron Exhaust Manifold be Welded

I had a shop try and weld my manifold once they pre-heated the entire manifold welded and then slow cooled in a oven. Cost me $100 took it home started studing it a little and there was 100's of small cracks inside exhaust ports. (junk) Went back to weld shop he claimed the cracks already existed. So the new manifold cost me an extra $100. Live and learn. Or in your case start a thread and learn. Good Luck
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Old 01-16-2007, 08:04 PM   #6
fishkisser
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Cool Re: Can a Cast Iron Exhaust Manifold be Welded

Old school says to repair it , Common sence says tossit and buy a new one.
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Old 01-17-2007, 03:24 PM   #7
cptdarel
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Default Re: Can a Cast Iron Exhaust Manifold be Welded

BUY NEW!!!, if it fails again, which it will, where do you think it will happen?
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