You must change it every 60,000 miles. Warning: This is an interference engine and as such if the belt breaks you will have very expensive internal engine damage.
Refer to (and understand) repair manual
chain
There is no timing belt in that engine. It has a timing chain.
HOW DO I INSTALL A TIMING BELT ON A 4D56 ENGINE
It has timing chain and gears. NO BELT
I need diagram serpentine belt for 1984 Nissan 4,2 L Nissan pick up
The k24t motor has a chain. That is the 2.4 litre, 4 cylinder motor. From what I remember - The V6 is also a chain.
I'd pick up a Haynes or Chilton manual for your truck. They generally have good pics and procedures.
how to set timmin chain 1992 Nissan for a 2.4liter
how do you change the tail lights on a 1996 Nissan pick up?
Diagram of ignition timimg marks
The crank shaft position sensor should be located next to or In behind the timing belt dust cover. You may have to remove the harmonic balancer pulley to reach them.