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I have a definitive on the root of the sound.. It's multi-faceted.
You have two things going on:
- Bad water pump bearing
- IMS bearing is beginning to go south
The water pump is the rumbling part of the sound, the IMS is the whirring sound.. I disconnected the serpentine belt after I used a stethoscope to listen to the water pump housing and hearing a rumbling sound... With that disconnected the rumble was gone but the whirring sound was more defined.
The IMS flange is leaking also.. You also have a pair of leaky cam covers and a few cracked coil packs along with at least one bad chain tensioner.
I'll go a little further in the morning, but a few hours this afternoon has proven that it's repairable.
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