I have pulled the pump too many times to keep count never have I replaced it. Now a smear of grease or oil when you go back in with it yes!!!! Also use hylomar on the pump cover and not replace it either yes to that also. To drain coolant loosen the three cover bolts a fee turns pry cover loose at the bottom slots by each bottom bolt and let the coolant drain into a pan. Then pull cover bolts and leave cover on the hose and hose on radiator. They will come off when you pull the radiator.