2010 TE 250 Squealing?

TE 250 black head (bmw year) has a whining squealing noise coming from the engine up by the water pump side. I heard this noise before and the bearing blew up. I'll include a picture of what bearing blew up. What can keep causing this ? Over tightented cam chain tensioner? Stretched cam chain ? I’m stumped any inside would be great thanks


the bearing circled red is the bearing that blew up last time I heard this noise. What should I replace and why is this happening? last time it was the bearing that sits inside the cylinder head. Help Please