After driving the 24v for about 10k km things went very wrong unfortunately. The hydraulic chain tensioner started leaking oil. I suppose because of this the chain was not fully tensioned and "hitting" the chain guides. The guides broke and the chain jumped a few teeth on the cam sprockets.

So it was time to get the engine out and on an engine stand.



Took some parts off...



Making the block look a bit more naked..





The engine from underneath with the sump taken off.



The two chain guides at the bottom were still there, although the plastic guide had cracked. All other guides were "missing". I found them in the sump in pieces...