if your changing the cps then the lower timing cover has to come off. however the whole water pump does not have to come off. but i just did my water pump, and i made my job huge when i didnt need to. my replacement pump (47$ at napa after 4$ core) was only the front bearing but i had already taken off the whole pump, timing belt, dampner, lower timing cover...turned a 2 hour job in to a 2 weekend job (lots of cleaning acounts for my slowness) anyway my sujestion is if your replacing the water pump dont put in a used part, just get a remanufactured one for about 50 bucks.