hi I need to identify this sound on the discovery 2 td5 year modifying production values 2001/4

video

 

I wish I could help but even with that horrible thumping I'm jealous that you have an awesome td5.

I have a small diesel engine that I've maintained for a long time (om617) so this borders on a guess but that sounds like a sticky valve to me.

 

Anyone else had this problem