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Nissan Navara snapped timing chain

My 2008 Nissan Navara STX D40 diesel snapped a timing chain and destroyed the engine. My mechanic says the tensioner failed and possibly caused the problem. Being six months out of warranty, I got no help from Nissan. Is the D40 a lemon?

I have had the odd reports of timing chains breaking, but every time I have checked into the issue I have been told the main reason for the failure is either a lack if servicing or poor servicing. It would appear that Nissan engines are more sensitive than most to having fresh oil running through their galleries and regular oil changes should be carried out religiously to avoid a build up of sludge resulting in blocked oil passages.

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