Hey mate, its my first day on this site. I had to register to let you know what I discovered my engine noise was. I have an 03 zd30 navara, bought it with a known engine issue very cheap. Have been driving it for 6 months with this annoying ticking and clunk. Removed the front end and sump today to find balance shaft floating in the breeze, The gear on the front stripped and the bearings laying in the sump. The negine seems to perform ok but wont be putting it back together in this state. Have been doing some reserch on running with balance shafts removed, will eliminate this failure issue once and for all. I think alot of ppl overlook this noise and arent aware this shaft is probably already damaged. Good luck with your issue. cheers to all