[fatlazyless]

The gearcase oil is very seperate from the water pump. It is down at the bottom of the engine, directly in front of the propeller, and the water pump and impeller is about two feet higher up, at the bottom of the engine area.

Definately get a step by step list of what to do from a Seloc manuel, or from an internet outboard repair forum before starting.

You have to remove the entire lower half of the engine to get access to the impeller. If you go to a Napa auto parts store, like the one in Meredith, they may have an impeller replace kit or can order one. They may be able to get you a copy of installation instructions, too. The Meredith Napa is good for marine replacement parts, especially for Mercury.