When It no longer hold proper tension if the belt is squeaking then it is probably time to change it
how to remove a power steering pulley on a 1997 Nissan altima
The 2005 Nissan Altima auto tensioner pulley can be removed by removing the center bolt. You will need to hold the pulley stationary while you loosen the bolt.
replace 1996 nissan 200sx se 1.6 tension pulley
you need to replace the alternator
Just turn the bolt against clockwise and it will come out easily ...
Use a small gear puller
To replace the belt on a Nissan Frontier, first loosen the idler pulley of the belt and remove the bolts. Then slip the replacement belt onto the pulley and put back the bolts.
3 bolts above your oil filter may have to move belt a
ca20? remove all the belts, water pump pulley, underdrive pulley, timing chain cover and timing belt and the water pump is accessible. I would replace the timing belt too.
You will need a small gear puller to do this. They make one that is smaller than a conventional gear puller (for removing crankshaft pulley/dampers) because the clearance behind the damper is a little thin between the pulley and the block. Try NAPA or AutoZone. AutoZone may have them in a blister pack on display.
The water pump on a 97 Nissan Sentra is behind the timing belt. To replace it you will need to drain the coolant, remove the cylinder head, loosen pulley bolts, drive belts, and water pump pulley. Next, remove coolant hoses, water pump bolts, and finally the old water pump. Reverse directions to replace with new pump.
1998 Nissan pathfinder crankshaft pulley bolt is right handed.