Hi, my D4 SDV6 has done 104,000 miles, fully serviced and no previous issues. Recently noticed a ‘clack clack clack’ suddenly coming from the engine and need to diagnose it. It happens when engine is cold or warm, frequency is proportional to engine revs (it gets quicker when revs increase, then slower with gear change up). Sound appears to coming from about waist high on the engine but hard to tell.

Please listen to this video and let me know if you can help!

D4 clacking noise

Do not drive it, get someone to come and check it out, I would suggest suspect crank failure.