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Cylinder head failure

Cylinder head failure

Cylinder head failure

What are the dark areas on the fracture surface of an aluminum die casting?

RE: Cylinder head failure

Any pictures? They say a 1000 words.

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RE: Cylinder head failure

They might be carbon.

RE: Cylinder head failure

Got any pix of the entire cylinder head ? Engine, air compressor, vacuum pump, or ???

RE: Cylinder head failure

Areas cracked first and carbon forced in the crack. Anything in that photo looked like shadows from lack of light to me.

RE: Cylinder head failure

Thank you all for the replies.
Apologize for the poor photo of this small piece. I've seen this failure before on a non engine application. It was a structural member that failed exhibiting the dark areas on the fracture surface. It was due to a casting defect from the producer but can't remember what was wrong in the casting process. The producer eventually fixed the problem.

RE: Cylinder head failure

It just looks like the fracture is dirty. Try sticking it in an ultrasonic cleaner for about 30 seconds.

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