Mercury - Quicksilver 8M0199643 Water Pump Repair Kit Cooling System Components Marine Composite/Metal Mix 8M0199643. Overview. There's a certain comfort that comes from knowing your engine's cooling system is ready for the long haul. When you're running across open water or easing along a shallow creek, you want that steady, reassuring flow of cooling water moving exactly the way it should. The Quicksilver Water Pump Repair Kit, part number 8M0199643, brings that peace of mind back into your ma