Hello, dear friends!
Have very uncommon problem.
Progressive unhelathy metall rattling sound from middle part of the block.
At first showed up as click sound only on cold engine once per 3 second (20 000km ago). Now it is permanent metall sound when worming up in progress. When engine bay wormed up sound almost not noticeble.


Facts:
-Sound loud when bay is cold (even if coolant warm)
-Several times when left wheel hit into the pit or bad road cover sound ended
-Not sounds like LMA or piston slap
-20k km


What have done:
- Power Steering Pump (belt off)
- Generator (bearings replacement)
- Tensioner pulley (Repalcement)
- Balance shaft pulley (Repalcement)

Maybe someone faced with problem like this?
Don`t know where to dig.
Thank you for your attension!

 

Check your crank pulley/crank pulley bolt.

 

Sounds like a bad belt. They are either extremely old or they are extremely loose, or a little of both. To confirm, spray each belt with some PB Blaster or anything lubricating. When noise goes way you found the bad belt.

 

Damn, man... It was really just a bad alternator belt. Who would have thought!
Thank you for your advice. It was very useful!