Mercury - Quicksilver Water Pump Repair Kit Cooling System Part 30-70HP 2-Stroke Outboards 77177A3. Overview. A healthy cooling system is what keeps your outboard running cool and dependable, season after season. The Mercury Marine 77177A3 Quicksilver Water Pump Repair Kit is one of the most complete kits available for Mercury and Mariner 30-70HP 2-stroke outboards. It includes everything you need - from the impeller and housings to the gaskets, seals, and water tube coupling. Whether you're doi