Quote:
Originally Posted by Ian181
I don't see any scoring in the cylinders, actually you can still see the crosshatch honing. There are two small areas that look like the ring might not be scraping in the one cylinder. The one intake valve looks like there's some burnt sludge around the inside. On that same side the head gasket, near the top, looks like it might have been leaking some too. Seems like a lot going on for a motor with 632 hours on it.
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Ahh, so you tore it down already? Post pics if you can. Check valve clearance with appropriate procedure, and rule that out as the culprit. If the intake valve is hanging open, it would cause combustion to leak back into the intake and could cause the issue you speak of with the cruddy looking valve. If it is ingesting oil, it could do the same thing. Easy enough to check the valves so you know exactly what you're dealing with.