Plymouth Neon Engine Rattle

EDIT/UPDATE: Apparently, the noise is the water pump. It wasn't displaying any of the classic signs of water pump failure, so that never even occurred to me. But eventually the pump seized and shredded the timing belt. Replaced those bits, and it's back to normal, sounding great (or, as great as a Neon can sound, anyway). Thanks to everyone who replied to this with ideas! Anyone have any idea what this noise might be? This video is documenting an odd rattle that is apparently coming from the bottom-end of the engine. It's a 2L SOHC four cylinder. No idea what's making the noise, but it doesn't seem to affect drivability any, nor does it raise the temperature or muck with the oil pressure.

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