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

To replace the oil pump on a Mazda B2200 2.2, first, disconnect the battery and drain the engine oil. Remove the oil pan by unbolting it, then detach the oil pump from the engine block by unscrewing the mounting bolts. Install the new oil pump by securing it in place, reattach the oil pan, and refill the engine with oil before reconnecting the battery and starting the engine to check for leaks.