I assume you are asking this question about how to check whether your oil pump is working?
Remove the slot-head plug at the bottom of the passenger's side engine block and hold down the starter rod for a second or two. If the pump is working, oil will shoot out of that hole. Be prepared for an oily mess from a strong stream of oil if the pump is working properly! If no oil comes out after a few engine revolutions or it only dribbles out, you have pump problems. Perhaps the pump's screen is clogged or the gears are stripped (rare).
Marshall