Thers is a major problem with the timing chain tensioner backing off allowing chain to come loose and eventually shearing teeth of the cogs which the chain runs on and the chain also snapping and causing the engine to seize.How do i know this fact? It has just happened with my 07 D40 deisel which has only done 89000 and 11 weeks out of warranty,i'm currently waiting to hear from nissan to see what they are going to do seeing that i took it to them complaining of a noise to which they replied"Its normal engine noise and nothing to be concerned about"That was at 70000 klms now i'm with out vehicle and possibly up **** creek even though i have full service history in tack,so get your timing chain tensioners and timing chain checked for gods sake so your not in the **** i'm in.