How do you replace the water pump belt on a Nissan 300zx?

To replace the water pump belt on a Nissan 300ZX, first, disconnect the negative battery terminal and remove any components obstructing access to the belt, such as the engine cover or fan. Loosen the tensioner pulley by turning its adjustment bolt, then slide the old belt off the water pump and crankshaft pulleys. Install the new belt by threading it around the pulleys, ensuring it is properly aligned, and then re-tighten the tensioner. Finally, reassemble any parts you removed and reconnect the battery.