Hello,
I am copying the answer from my Nissan Pathfinder repair Manual.
This is for 2.5L and 3.3 L engines, NOT THE 3.5 L ENGINE!!!
1- Disconnect Negative cable from the battery. Rause the front of of the vehicle and secure it on jackstands.
2. Remove the engine under cover. Remove the lower radiatorshroud and remove the engine colling fan.
3. Remove the drivebelts.
4. Use a strap wrench around the crankshaft pulley to hold it while using a breaker bar and socket to remove the cranshaft pulley center bolt.
5. Wedge a prybar or two screwdrivers behind the crankshaft and carefully pry it off the crankshaft. If the pulley is difficult to remove, use a jaw-type puller and pull it off.
Installation is the reverse of removal. Tighten the pulley bolt to the torque listed in the manual, then adjust drivebelts.
Hope this helps-S
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