Mercury - Impeller Repair Kit - 8M0200136. Mercury Impeller Repair Kit 8M0200136 keeps your engine's cooling system working the way it was designed, delivering strong water flow to help protect against overheating and premature wear. It is engineered specifically for late-model high-output Mercury and Mercury Racing outboards, so you get a precise fit and dependable performance with every service.. Compatible Engines. Mercury 5.7L V10 350-425 HP outboards. Mercury Racing 4.6L V8 500R outboards. What's Included. This is one of the most complete water pump repair kits available for these four-stroke outboards. It includes:. Face plate. Water pump impeller. Impeller key. Gaskets. Seals. O-rings. Key. Installation instructions. Using a genuine Mercury impeller kit helps maintain proper cooling flow rates, which is critical for protecting internal engine components, especially on high-performance motors. Every part in this kit is designed, engineered and tested by Mercury to deliver the cor