How do you replace the crank pulley on a 99 Infiniti QX4 and what other issues might you need to address?

To replace the crank pulley on a 1999 Infiniti QX4, first, disconnect the battery, then remove any accessories obstructing access, such as the serpentine belt and harmonic balancer. Use a socket and breaker bar to remove the crankshaft bolt and carefully pull off the old pulley. It's advisable to inspect and potentially replace the timing belt, seals, and any worn gaskets while you're in the area, as well as check for any signs of oil leaks or wear on associated components. Finally, ensure everything is torqued to specifications and reassemble in the reverse order.