Weird click/tap coming from alternator?

[Seeefo]

I finished doing timing chain guides and after starting the car I am hearing this noise that sounds like its coming from the alternator. I didn't actually remove the alternator from its mount on the lower timing chain cover.

The noise follows engine speed and doesn't really change warmed up/cold. I don't have any electrical issues so far, but the car is pretty new to me.

https://drive.google.com/open?id=0B4...mJQaVZ3endhdlU

I have looked around and it doesn't really match any of the soundbites I found relating to alternators going bad. It sounds fairly mechanical in nature (ie something is physically tapping something else).

Anyone experience this or have any advice?

[waters17]

I'd try taking the belt off and spinning it by hand. See if it has any resistance or makes any noise.

[Seeefo]

Just did that.

No belt on and the car sounds normal. Pulley has no visible play. Noise is not reproducible with a hand spin at all. No weird noises either. The resistance is about what I would expect out of an alternator, but it's not something I am testing often... If I spin I give it a good spin by hand how much rotation should I expect? I can mark it and test.

[waters17]

In my experience, it should rotate smoothly but have a weighted feel. I guess it's something that's not easy to explain. It almost sounds like a pump type noise though. Like a mix of air and coolant cycling through the alternator. That's about all I got.