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Hi. You came to the right place for info.
The engine in the Xterra is what is called an interference engine. This means if the timing belt breaks there is a good chance there is internal damage to the valves or Pistons. It is highly advised to take the "heads" off to inspect it before replacing the timing belt.

Here is a link explaining the interference engine:

Once you are sure there is no internal damage there is plenty of info here about replacing the timing belt. Hope this helps some.
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