I am trying to learn about shaft seals, and adjusting them.
I continually have 3-4 inches of water in the engine bilges and there is always a concern of what happens if a bilge pump goes down.

Is a dry bilge possible with regular shaft seals? How much water should be in the bilge, is it normal to have a few inches? I'm guessing I need to check them, possible tighten them or repack them.

Is repacking something you have to do on land?

Thanks for any input!

Currently in inside heated water well and lining up my winter projects.