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Diagnosing possible bearing sound source?

film842

Contributing Member
After replacing just about everything external on my AQ131A, she fired right up and is running well and smoothly, with one exception.

I'm hearing a sound that cycles in and out and it sounds like a bearing of some sort. I had the same sound in the engine originally and I thought it was the alternator bearing going out.

However I put in a new alternator and the sound is still there. I can only assume that it might be the water pump?

Before I start taking everything apart again, can anybody make a guess as to what else it could be? Thanks.
 
this can narrow down the guessing:

mechanicsstethoscope41966.jpg
 
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