Whining Noise From Engine

Get mechanics stethoscope and start carefully poking around. Had a horrible noise on my Tundra that I couldn't locate. Stethoscoped every pulley, found it was the alternator bearings. Replaced, noise gone.
 
How we hear noises can be very subjective (like most of things in life) so just as another data points, here is my story (case): first off all, I have not “heard” the wining noise in my 4Runner until I have read this thread (LOL)….

After reading it- it is confirmed: the wining noise is there and mostly pronounced between 2K and 4K RMP –noise is not impacted by engine load , ambient and \or engine temperature and not impacted by what gear transmission is in (Drive, Reverse, Neutral, etc..); in my case, changing to deferent type of oil had no impact on the noise (went from Mobil 1 to Shell Rotella - both 0W-20 -Full Synthetic oil with OEM filter), noise is internal, as the same noise is there with serpentine belt removed.

After above results, I have stopped by Toyota dealer and told them I want to listen the 4Runner 4.0 L V6 engine sound, result: 2019 TRD Pro (4 miles on the clock) and 2017 SR5 with 22K miles sounded exactly like my 2013 Trail (with 65K)- they both had the same “wining noise” – so at this point, I am going to call it: “characteristic” sound of this engine…

Would I wish this wining noise would not be there…? Sure, I would!

But, I also wish I would not read that thread to begin with… LOL.

My $.02


Above is what I have posted in this thread 5 years and 52 thousands miles ago (in 2019)… as of now, in 2024 my 4Runner sounds and feels exactly as it was back in 2019... :banana:
 
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