Here are two videos of the noises.

This is one where I pried the top timing cover open slightly. You can hear some kind of rattling:

https://www.youtube.com/watch?v=YbgY...ature=youtu.be

This one is beside the timing cover. You can hear a rhythmic noise:

https://www.youtube.com/watch?v=GLFL...ature=youtu.be