Mercury - Upper Water Pump Repair Kit Cooling System Polymer & Elastomer Components 8M0061040. Overview. Every boater knows that a dependable cooling system is the quiet heartbeat of an engine that lasts. When you're running across open water, trimming into a tight channel, or just easing back toward the dock after a long day, you want the comfort of knowing your outboard is being cooled the way Mercury intended. The Quicksilver 8M0061040 Upper Water Pump Repair Kit gives you that sense of assur