Loud grinding noise: won't restart

I didnt know this car had PCV. Where is it and how do I access it? the reason I thought it might be a rod is I can turn the engine over by hand to a point, until it stops, as if something is jamming one of the pistons. I would hate to think that I broke a piston, so if it is something like the PCV, which Im sure will be much easier to access then having to pull the engine and tear it down. thanks!