1981 25 evinrude lower unit seals

[evinrude25]

To change the lower unit seals do I have to take the lower unit off are can I just unscrew it since it splits in half. I am getting water in the lower unit and when I took off the propeller I saw some oil. I am thinking that this should be dry. If you have instruction on how to change the lower unit seals for a 1981 25 hp please let me know.

[boats.net]

Easier to do if remove gearcase.