Mercury - Water Pump Repair Kit V6 & V8 Sterndrive Series High-Flow Cooling Components 8M0104229. Overview. Every boater knows that the health of a sterndrive lives and dies by its cooling system. When you are cruising across open water or easing toward your slip at sunset, you expect your engine temperatures to stay steady and predictable. That kind of confidence only comes from using parts you can trust-parts that are built to handle long weekends, rough chop and the unexpected moments every s