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 to Mercury’s original standards. It’s simple, reliable, and designed to keep your outboard running cool, even through long days on the water.

Key Features

• Purpose: Replaces worn or damaged upper pump components to restore full cooling flow.
• Contents: Includes impeller, plates, o-ring, key, gaskets, and upper housing — a complete 7-piece rebuild set.
• Material: Made from marine-grade rubber and corrosion-resistant metals that stand up to heat and saltwater.
• Performance: Ensures smooth, steady water flow to prevent overheating and improve cooling efficiency.
• Durability: Withstands pressure, vibration, and wear in demanding marine conditions.
• Ease of Service: Installs easily with hand tools — a quick repair that keeps your motor reliable.

Engine & Boat Compatibility

• Mercury 40HP 2-stroke outboards
• Mercury 50HP 2-stroke outboards
• Mercury 60HP 2-stroke outboards
• Mercury 70HP 2-stroke outboards
• Mariner 40–70HP 2-stroke outboards

Performance & Real-World Benefits

The 60366Q1 repair kit restores proper water pressure and cooling efficiency by replacing the parts that wear out most over time. The flexible impeller delivers reliable water flow at every speed, while the gaskets and seals prevent air leaks that can reduce pressure. The molded housing keeps everything aligned and sealed tight.

Once rebuilt, your pump runs like new — keeping temperatures steady, protecting your powerhead, and giving you the confidence to run longer without overheating worries.

Why Choose Mercury OEM

The Quicksilver 60366Q1 is a genuine Mercury Marine kit, engineered specifically for older 40–70HP outboards. Generic kits can look similar but often include stiffer rubber, thin gaskets, or poorly machined parts that hurt performance.

Mercury’s OEM kits use high-quality materials tested for real marine use. They fit perfectly, hold pressure, and last longer, ensuring your cooling system performs exactly as it should.

FAQ

Q1: What engines does this kit fit?
It’s designed for older Mercury and Mariner 40–70HP 2-stroke outboards.

Q2: What’s included in the kit?
You get 7 pieces — impeller, gaskets, o-ring, plates, key, and molded upper housing.

Q3: How often should I rebuild the pump?
Inspect the impeller every season and rebuild every 2 years or 200 hours of use.

Q4: What’s the impeller made of?
A flexible marine elastomer that stays soft and maintains strong flow under pressure.

Q5: Why OEM instead of aftermarket?
Mercury OEM parts ensure the right fit, reliable performance, and long-lasting protection your engine was built for.