How to replace a cooling water impeller of an outboard motor - Mercury sea pro 25 HP

This quick tutorial will show you how you can replace the cooling water impeller of an outboard motor. In this video we replaced an impeller of a Mercury sea pro 25 HP outboard motor mounted on a ships rescue boat. Time stamps: 00:00 intro 00:18 Tools required 00:34 Dismantling the propellor hub 01:34 Dismantling the pump housing 02:21 Comparison between old and new impeller 02:34 Boxing up the pump housing 02:57 Boxing up the propeller hub 03:52 Trying out the engine.