timing chain is making clacking noises when engine is start

I have had the vehicle for only six months, already had to repair the O-Ring on the vehicle which is something else that the manufacturer has wrong, there was a lot of smoke coming my exhaust during start up to include the rattling noise. I have repaired the O-Ring on the vehicle and have spent over $200 on just that. It will be good if the Manufacturer that already acknowledge the issues get it repaired for the Nissan owners to prevent them from getting sued in case of any tragedies occur.