Your timing chain tensioner needs replaced if it is making noise! They have a tendency of breaking off around the mount. The tensioner also has a piece of plastic the rides against the chain that wears out. Replace the chain and tensioner at the same time, you also may conceder replacing the seals while your at it.
This is an interference engine (all Nissan's are except the minivan) On this engine breaking a timing chain will not only bend the valves but also pop holes in the piston tops. If you DIY be sure you have the timing set right! Pull the #1 plug, check your timing mark, make sure your at TDC and your cam sprocket is on the mark!
My friend decided to replace his timing chain and broken tensioner last month, did not double check his timing. Needles to say he bent 3 valves and put holes in 2 pistons. $800 for a used engine a case of beer for labor...
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