i have a 1971 johnson 60hp with the electric shift and this is my first motor so im not sure of much and dont have a manual yet but i need this motor up and going fast but anyways the motor hasnt been used in some time and i got to thinking the impeller prolly needs replaced to be on the safe side. so i just need to know if im right on taking the lower unit off all i have to do is unhook the blue and green wires from around the powerhead tie a string to them to make getting them back up easier then i just unscrew the bolts connecting the lower unit to the midsection then just drop it down. feeding the wires through slow and easy. is that right? and when i put the impeller in someone said something about oiling it do i do that and with what kinda oil. do i need to use a sealer like blue rtv sealant on the housing and on the lower unit when i put it back on? thanks for any and all help you can give.