How do you replace water pump on Isuzu i mark?

To replace the water pump on an Isuzu I-Mark, first ensure the engine is cool and disconnect the battery. Drain the coolant, then remove any components obstructing access to the water pump, such as the timing belt or serpentine belt. Unbolt the old water pump, clean the mounting surface, and install the new pump with a new gasket. Finally, reassemble everything, refill the coolant, and check for leaks.