Mercury - Quicksilver Upper Water Pump Repair Kit Cooling System Part 40-70HP 2-Stroke 60366Q1. Overview. When your outboard starts running hot or losing water pressure, it's usually time to rebuild the pump. The Mercury Marine 60366Q1 Quicksilver Upper Water Pump Repair Kit has everything you need to bring your older 40-70HP Mercury or Mariner 2-stroke back to proper cooling performance. The 7-piece set includes gaskets, o-rings, plates, the impeller, key, and molded upper housing - all built t