How do you replace the oil pump on a mazda b2200 with a 2.2?

To replace the oil pump on a Mazda B2200 with a 2.2 engine, first disconnect the battery and drain the engine oil. Remove the oil pan by unbolting it and gently prying it off, then detach the oil pump from the engine block by unscrewing the mounting bolts. Install the new oil pump, ensuring proper alignment with the oil pickup tube, then reassemble the oil pan and refill with oil. Finally, reconnect the battery and start the engine to check for leaks and proper operation.