I have a oil leak on my B18C... I know it's coming from the crankseal on oil pump side... I was told that I was suppose to spray WD40 on that seal before putting the oil pump on.. After the motor was together... How hard is it to replace. can't I just remove the crank pulley and T-Belt and then just us a right angled pick?? Or do I have to remove the whole oil pump and then relplace that seal???