A question about a 99 cummins

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Mike - 22 Feb 2007 02:53 GMT

I noticed a 2 inch crack in the exhaust header with some blackening from
exhaust coming out of about the 3rd cylinder from the front. Will it hurt
to run like this or could cold air be drawn into the valve when I shut it
off thus warping the valve or some mechanical unforseen nightmare like that?

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GeekBoy - 22 Feb 2007 05:20 GMT

Time for JB Weld.

>I noticed a 2 inch crack in the exhaust header with some blackening from
>exhaust coming out of about the 3rd cylinder from the front. Will it hurt
>to run like this or could cold air be drawn into the valve when I shut it
>off thus warping the valve or some mechanical unforseen nightmare like
>that?

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Tom Lawrence - 22 Feb 2007 06:06 GMT

> Time for JB Weld.

Not on an exhaust manifold. J-B Weld's site says their product only resists
temps up to 500°F.

It needs to be brazed, and needs to be done by a competent
weldor/metalworker.

The alternative is to take this opportunity to replace it with an
aftermarket 3-piece manifold that won't crack due to the heat cycling.

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