w211 engine sound, cold engine

[Copenhagen]

I have a Mercedes E 220 CDI aut from 2008.

At cold start in the morning, the engine starts smoothly and runs fine in idle.

But when I try to put it into either reverse or forward gear, it say a worring knocking sound and stops. When engine has run for some minutes, I can put it in gear, but the sound continues for 30 secs and then disappers, and the car runs without any problem rest of day. Also after e.g. 7 hours parking, there is no problem

I have taped the sound in the video on the link below.

This is my first post in here, so please let me know if I do anything wrong.

Thanks!

https://mega.nz/#!lk8kWDxA

 

[Copenhagen]

Link to video with sound in dropbox if you don't have mega installed on mobile: https://www.dropbox.com/s/rz0voez1p7xxx9z/w211 engine sound.MOV?dl=0