Disconnect the battery cable and drain the oil after removing the filter, to remove the oil pan. Remove the exhaust pipe and fan shroud as well as the starter motor. All nuts should be loosened and brackets through bolts removed. Raise the engine using a jack, remove pan bolts, and maneuver the pan out. You can clean components, inspect for wear, replace O-ring as necessary, place gasket on pan and pick-up tube then reinstall them. Further, bolts should be tightened up; surfaces cleaned and secure fastening ensured. Fill with oil, start the engine, and check for leaks.