Cold engine unusual knock zd30 crd

Good day to everyone. My car YOM 2013 no egr by factory have an engine knock when decelarates above 2000 rpm. This is more noticeable after cold start. I have done diesel purge, fuel filter change, liqui moly Injector cleaning but non of them worked. This knock is coming from top of the engine. No fault codes with scanguage. Otherwise engine runs perfectly smooth. The video is attached below and appreciate any suggestions. Thanks

https://youtu.be/bgv-hNmHGUU


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