Diesel motor pound Izuzu C223

Which can be the most likely cause of this sound.

Hi Guillermo_Felipe.
If you have black smoke and the pounding is deaf (like wood to wood), it is most likely to be injection, it would be necessary to look for injector by injector with the machine minimum to identify which is the bad. If the blow is like metal to wood and the oil pressure is low, it would be necessary to look for bench caps, in that case you would have dark gray smoke. If the blow is metallic the damage can be by valve or valve seat, the smoke would be white. I hope the data is useful. LUCK
MIGUEL