If the motor has not been turned over without the belt you should be able to put the new belt on where it is..
The recommended mileage to change a timing belt on a 1995 Nissan Pathfinder is 100,000 miles. The belt may need replaced before this.
Timing belt
The 2001 Nissan Pathfinder has a 3.5 liter engine with a timing chain rather than a belt. http://www.samarins.com/reviews/pathfinder.html
Chain
Timing chain
Timing chain
105000 milesd
Yes
http://wiki.answers.com/Q/Does_1999_nissan_pathfinder_have_timing_belt"
The 4.0 litre V6 engine in a 2006 Nissan Pathfinder has a timing CHAIN
Behind the timing belt cover.