Finally got some time to remove the old water pump from my rig and can confirm it was the culprit:
I ended up cancelling my order with TPD and went with the Aisin parts from Amazon. The shipping time just would have taken too long. I also purchased a new fan clutch which makes sense to...
Thanks for the exceptionally detailed reply, @Robert Franzke!
My best guess is that the water pump bearing self-destructed (figure 1 from the second illustration) and it looks like the scrap of metal I found has a seam that could possibly correspond to the outer housing of the bearing. I'm busy...
Okay, I've removed the power steering and alternator belts, started her up, and she sounds great. I think I can rule out any shenanigans with the harmonic balancer, woodruff key, or anything in the crank case.
I tried manually spinning the water pump pulley and detected no unusual noises or...
@Robert Franzke - Negative. No weeping of any kind from the water pump itself.
@John McVicker - Roger that. Going to start methodically removing belts.
I took another look for anything out of the ordinary and I found this shiny bit of metal loosely hanging out on the engine-side of the pulley that the fan clutch is connected to:
Is that the pulley that drives the water pump? If so, I think the water pump can be raised to the top of the list...
Here are some better quality videos I took this morning after letting the rig sit overnight:
@LAMBCRUSHER - Valve adjustment was done about 7k ago and it still sounds pretty good. Temp sensor and harness visually look okay, but didn't perform the FSM diagnostics on it. Not sure how they...
EDIT: Future readers - The root cause turned out to be the water pump!
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While driving home today, I came to stop in front of my house, heard a loud squeal coming from my engine compartment, and the truck stalled to a shut.
Got her started back up...
I love those firewall ports for the AC lines. The OE lines / plugs are definitely a weak point and your new setup looks like an improvement. Did you fab those or did they come with a kit?
Are you going to charge with r134a?
Also, is that the stock compressor or is it one that's compatible with...
@Ojaicruiser - Cool photos! To think that I did this on my garage floor. Sheesh!
Yup, those are the isolators. The hardest part of installing OME's is getting the springs and axle aligned with each other. A common trick is to use ratchet straps to pull them together close enough so you can get...
@Ojaicruiser - The ubolts I got from OME and from 4plus were too long and I had to cut 'em down by 2 - 3". The heavy rear spring pack really isn't that much taller than the original springs.