Stop in for a cup of coffee

It wouldn't take much of a tear. Might just be the picture, but what is going on here?

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Just residue oil
and it appears to have been ingesting water from the flash rust in the cylinder

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and, this piston crown appears to be steam cleaned of the carbon. Sign there was water present during combustion

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Agreed ^ but the head isn’t steam cleaned. Not the injector
Could a couple of those pits be detonation?
In a diesel that would be rare