How do you change water pump on rover 420d?

To change the water pump on a Rover 420d, first ensure the engine is cool, then disconnect the battery. Remove the drive belts and any components obstructing access to the water pump, such as the timing belt or cover. Unbolt the old water pump, clean the mounting surface, and install the new pump with a new gasket. Finally, reassemble everything, refill the cooling system, and check for leaks.