Mercury - Water Pump Repair Kit Cooling System Series OEM Components 8M0113799. Overview. Every boater knows that a good day on the water starts with a cool, steady-running engine. When your outboard's water pump is healthy, the whole boat feels different - the idle is calmer, the throttle responds cleaner, and you're not glancing at the temperature gauge every few minutes. The Mercury 8M0113799 Water Pump Repair Kit brings that feeling back. It's the kind of kit you keep on hand because you kno