Hello guys,
This is my first post
I own a '02 w211 270cdi and it has done almost 300k miles (around 500k kilometers)
A lot has been done to it but this sound like a bad ball bearing persists.When you first start the car in the morning you can't hear it but after about 20seconds it slowly creeps in .. What could it be?
All the pulleys have been changed except crankshaft pulley but it has no play in it. The sound is still there. So what could it be? Chain, guides, tensioner, oil pump chain, guide and tensioner?
I have a link below to a video I made showcasing the problematic sound.
Thank you all
OM647 link
This is my first post

I own a '02 w211 270cdi and it has done almost 300k miles (around 500k kilometers)
A lot has been done to it but this sound like a bad ball bearing persists.When you first start the car in the morning you can't hear it but after about 20seconds it slowly creeps in .. What could it be?
All the pulleys have been changed except crankshaft pulley but it has no play in it. The sound is still there. So what could it be? Chain, guides, tensioner, oil pump chain, guide and tensioner?
I have a link below to a video I made showcasing the problematic sound.
Thank you all

OM647 link