tips for welding cracked exhaust manifolds?

[Pat Dooley]

You need nickel rod or wire to weld cast iron.
Heat the weld area with an oxy/acet torch until it almost glows.
Weld about 1/4 to 1/2 inch then tap the area with a hammer about 10 times.
Continue until crack is sealed.

I welded a Garrett flange to a rabbit exhaust manifold years ago using this
technique with no failures to date.

> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of scott thomas
> Sent: Sunday, January 19, 2003 2:12 PM
> To: quattro at audifans.com
> Subject: tips for welding cracked exhaust manifolds?
>
>
> I just bought an 88 amp Lincoln wire feed welder and was wondering if
> it's heavy duty enough to weld an exhuast manifold crack for a 10vt?
>
> Any tips on how to do this? I heard someone heated his manifold in
> his BBQ grill ahead of time.
>
> I've got a bunch of manifolds from three different cars. All have the
> same crack on cylinder #3, as well as some cracking at the collector.
> Luckily, I had an uncracked one to put on my car during a recent
> upper end rebuild.
>
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