3.0D (M57N) Tapping/Knocking/Ticking?

[zuvarak]

The piece that came out doesn't really resemble anything that could just fall into the intake. The intake I have is without the swirl flaps, so at least there's that.
The shop replaced all valves in cyl 4 and assembled everything back together as I decided that at this point it's not financially reasonable to go deeper into the block.
After assembling everything there's still that tapping sound that's heard the best from underneath the car. Bearings I suppose. Here's a vid for you if interested:

That same tapping began before the engine started to run rough. So all of this could have easily happened due to a bad injector.

So basically I just paid 1000€ to find out something that could have been also found with an endoscope and I still ended up with a broken engine.

Current plan is to find a replacement 2nd hand EU3 160KW engine, which seem to be in the ballpark of 500 - 900€, depending on various factors..could be worse.

[Clavurion]

Check if the valve plate on EGR valve is still intact. If it's OK then it must be something the previous shop dropped in intake duct or left inside intake manifold.

[zuvarak]

Originally Posted by Clavurion

Check if the valve plate on EGR valve is still intact. If it's OK then it must be something the previous shop dropped in intake duct or left inside intake manifold.

The EGR seems to be intact

[zuvarak]

Update.

My X is currently on the lift and the block swap in underway. I did find a 2nd hand bare block for 500€ in relatively good condition. Didn't find any internal damage so far, but did decide to refurbish the cylinder head.
Injectors were sent off to a test stand.
Replacement block will get new chains + bearings.
Will be a hefty bill from this shop after all is done..