consequences of using cracked exhaust manifold?

[Phil Payne]

> My local pick-n-pull has 3 manifolds.  They are not cracked
> (visibly) in any of the runners, but are cracked internally where the
> runners merge into the turbo inlet.  I'm not sure which is worse.... I'd
> hate to think of a piece of metal flaking off inside and going through the
> turbo.

I've never taken a one-piece manifold off and not found that crack.

To check whether internal cracks go through, hold the manifold with the flange uppermost and spray WD40 into it.  It will weep through any cracks.



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