Squealing noise on Prado diesel motor

[Magneto7 Lurker Find all posts View Profile Close Magneto7]

I took a video of the squealing noise coming from Prado diesel, 2008 GXL.
There's no noise when coasting and the onset is when begin to accelerate and it gets worse with the foot flat to floor as shown in video.

I thought it was the drive belt for sure and had the mechanic swap it over for a new one without asking to check it out, but sadly it made no difference.
So much for my self-diagnosis!

Was hoping for a better suggestion as to the origins of the noise.
It can't be too serious, as it's done 10,000km while making the noise.

Thanks for the pointers.

[Piggy Water pistol pilot. Find all posts View Profile Close Piggy]

Sounds like a turbo whine to me.. Take the drive belt off and run it up, it will be fine for a couple minutes from a cold engine with no drive belt, but no longer than that or you'll over heat it. If noise is still there, I would be looking for a boost leak, split inlet hose etc.

[[email protected] Lurker Find all posts View Profile Close [email protected]]

I had a similar sound coming from the front of mine (what I can make out from the vid anyway). I thought drive belt or idler but it turned out to be the over run bearing on the front of the alternator.

If you take the belt off and turn the alternator quickly, then grip the pulley to stop it the shaft should continue to "over run" a little. Mine was seized and made an awful racket when I started the car. Just an idea. Perhaps a little inox would have helped but I ended up getting a new alternator.