One way to tell if the timing chain is broken on your Nissan Altima is to see if it will start. If it starts, it is not the timing chain. You can also remove the distributor cap, have someone step on the gas while you watch the engine. If the rotor moves, it is not the timing chain.
timing chain diagram for 1998 Nissan altima
The 2006 Nissan Altima V6 has a timing chain.
chain
timing CHAIN
The 2.5 litre four cylinder engine in a 2003 Nissan Altima has a timing CHAIN
chain
The 3.5 litre V6 engine in a 2007 Nissan Altima has a timing CHAIN
No, timing chain.
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Chain
Yes it has a chain.
Chain