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 doing preventative maintenance or rebuilding a tired pump, this OEM kit restores proper water flow and helps protect your engine from overheating.

Key Features

• Purpose: Rebuilds the water pump to restore consistent engine cooling.
• Contents: Includes impeller, upper and lower housings, gaskets, seals, drive key, face plate, seal carrier, and water tube coupling.
• Material: Made with marine-grade rubber and corrosion-resistant metals for durability.
• Performance: Maintains proper water pressure for steady engine temperature and smooth running.
• Durability: Built to handle salt, vibration, and heat without losing shape or strength.
• Ease of Service: All-in-one OEM kit for an accurate fit and simple installation.

Engine & Boat Compatibility

• Mercury 30–70HP 2-stroke outboards
• Mariner 30–70HP 2-stroke outboards

Performance & Real-World Benefits

The 77177A3 kit restores cooling efficiency by replacing worn or damaged pump components that can lead to overheating. The flexible impeller provides a steady water flow, while the precision-molded housings and seals prevent leaks and maintain pressure.

Installing this kit ensures your engine runs at the right temperature, idles smoother, and lasts longer. It’s a simple fix that can make a big difference in how your outboard performs and how much peace of mind you have when you’re miles from shore.

Why Choose Mercury OEM

The Quicksilver 77177A3 is a genuine Mercury Marine repair kit, made to exact factory tolerances. Aftermarket kits may fit loosely or use materials that can swell or crack under heat. Mercury’s OEM kits are tested for flow rate, seal integrity, and durability in real-world marine environments.

Using OEM ensures that every part matches perfectly — keeping your cooling system efficient and your engine protected for years of reliable service.

FAQ

Q1: What engines does this kit fit?
It fits Mercury and Mariner 30–70HP 2-stroke outboards.

Q2: What’s included in the kit?
Everything you need: impeller, housings, seals, gaskets, drive key, face plate, seal carrier, and water tube coupling.

Q3: Why should I replace my water pump?
A weak or failing pump can lead to overheating, poor performance, or serious engine damage.

Q4: How hard is it to install?
It’s straightforward with a service manual and basic tools — a common DIY job for boat owners.

Q5: Why OEM instead of aftermarket?
Mercury OEM kits ensure proper fit, flow, and longevity, keeping your engine’s cooling system dependable and leak-free.