I have had my 08 nav with 140k just diagnosed with a snapped lower timing chain. It just stopped as I was driving. Does anyone know the cheapest way out. Should I get an exchange engine about 8k plus labour to swap over. Or should I inspect the damage first quoted up to 14k. Is it possible that it may just need a new head and chain without piston damage? I had just asked the dealer when it was serviced about inspecting it and nissans reply was that we don't need to inspect if there is no noise? Frustrated!