1998 Nissan pathfinder crankshaft pulley bolt is right handed.
The crankshaft pulley has broken causing the outer ring to slide forward into the fan assy. replace your crankshaft pulley and all will be well
The idler pulley on a 2003 Nissan Sentra 1.8 is changed by removing the engine accessories, removing the drive belts, and loosening the retaining bolt. The pulley can then be removed from the vehicle and a new one bolted into place.
Crankshaft pulley turns with the crank, if it won't turn at all, something internally is broken.
either sell the car or pulley engine out
Bent, Broken, or misaligned pulley
Check for a slipping drive belt between encine crank pulley and AC compressor pulley.
The crankshaft pulley is the large pulley on the lower passenger side of the engine.
You will need a tool called a puller to remove your crankshaft on your Nissan Xterra. You can purchase this toll at most auto parts stores, or borrow one from a shop or another mechanic.
the crankshaft sensor is located behind the crank pulley. the bottom pulley
The alternator on a 2001 Nissan Sentra is replaced by loosening the serpentine belt tension, loosening the alternator bolts, and slipping the belt off the pulley. The alternator can then be unbolted, the wiring harness disconnected, and a new alternator put in place.