Mercury – Quicksilver 821354A2 Water Pump Repair Kit | Mercury & Mariner 25–50HP 2-Stroke & 4-Stroke Outboards | 821354A2

Overview

Keeping your outboard’s cooling system in top shape is one of the easiest ways to protect your engine. The Quicksilver 821354A2 Water Pump Repair Kit gives you everything you need to rebuild the pump on Mercury and Mariner 25–50HP 2-stroke and 4-stroke outboards.

This OEM kit includes all the essentials — the impeller, drive key, faceplate, gaskets, and water tube seal — designed to Mercury’s factory specs for perfect fit and reliable flow. Whether you’re doing routine maintenance or bringing an older engine back to life, this kit keeps your motor running cool and dependable.

Key Features

• Purpose: Restores proper water flow to maintain engine cooling and prevent overheating.
• Fitment: For Mercury and Mariner 25–50HP 2-stroke and 4-stroke outboards.
• Kit Contents: Includes impeller, drive key, faceplate, gaskets, and water tube seal.
• Durability: Built with marine-grade materials tested to Mercury Marine’s OEM standards.
• Ease of Install: Direct-fit components designed for simple installation with common hand tools.

Engine & Boat Compatibility

• Mercury and Mariner 25–50HP 2-stroke and 4-stroke outboards
• Common on small fishing boats, pontoons, and light-duty runabouts

Performance & Practical Benefits

The 821354A2 Water Pump Kit brings your cooling system back to full strength by replacing the components most affected by wear. A new impeller and tight seals help maintain water pressure, keeping your outboard at the right temperature for efficiency and longevity.

The included faceplate and gaskets ensure a leak-free assembly that resists corrosion and heat. Regular pump maintenance with this OEM kit prevents overheating and extends the life of your entire engine — a small job that pays off in reliability every season.

Why Buy OEM

Mercury’s OEM repair kits are engineered with precision — made for the exact tolerances and materials your engine requires. Aftermarket parts may not fit as tightly or last as long under marine heat and vibration.

A genuine Quicksilver water pump kit guarantees factory-level performance and durability, so you can focus on the water, not your motor.

FAQ

Q1: What engines fit the Quicksilver 821354A2 kit?
A: It fits Mercury and Mariner 25–50HP 2-stroke and 4-stroke outboards.

Q2: What’s included in the kit?
A: The kit contains impeller, drive key, faceplate, gaskets, and water tube seal.

Q3: How often should I replace the water pump?
A: Mercury recommends inspecting the impeller annually and replacing the full kit every 2–3 years.

Q4: Can I install it myself?
A: Yes. With basic tools and a service manual, most owners can install it in under an hour.

Q5: Why choose OEM instead of aftermarket?
A: OEM kits fit perfectly, last longer, and use materials tested to handle marine temperatures and pressure.