Originally Posted by KhanTyranitar

The timing chain is never overdue. It is designed to last the life of the engine and does not need to be replaced unless it is making noise. If you keep on top of your oil changes and use the factory specified fluid (no snake oil or changing the viscosity because someone recommended it) then it will never fail, the engine will loose compression and wear out naturally long before the chain lets go. No point in tearing apart the engine to replace something thats is not a maintenance item.