Mercury – Quicksilver 821351A3 Upper Water Pump Housing Repair Kit | Mercury 25–50HP FourStroke, BigFoot & Bodensee Outboards | 821351A3

Overview

When your outboard’s water pump starts losing pressure, it’s often the upper housing that needs attention. The Quicksilver 821351A3 Upper Water Pump Housing Repair Kit restores full cooling efficiency in Mercury 25–50HP FourStroke carbureted, BigFoot, and Bodensee outboards.

This 3-piece OEM kit includes everything you need to repair the upper pump housing. It’s built to Mercury’s exact specs for a perfect fit, steady water flow, and dependable protection against overheating — so your motor runs cool and smooth, season after season.

Key Features

• Purpose: Repairs worn or damaged water pump housing to restore proper cooling flow.
• Fitment: For Mercury 25–50HP FourStroke carbureted, BigFoot, and Bodensee outboards.
• Kit Contents: 3-piece repair kit includes housing and seals required for upper pump service.
• Installation: Straightforward install with basic tools — no modifications needed.
• OEM Quality: Designed to Mercury Marine factory standards for performance and durability.

Engine & Boat Compatibility

• Mercury 25–50HP FourStroke carbureted outboards
• Mercury BigFoot and Bodensee models
• Common on pontoons, runabouts, and small fishing boats

Performance & Practical Benefits

The 821351A3 kit restores tight sealing and proper flow in your outboard’s cooling system. Over time, heat and debris wear down the pump housing, reducing water pressure and risking overheating. This OEM replacement rebuilds that section so your cooling system runs like new.

The marine-grade materials resist corrosion and heat, keeping water flow steady in both fresh and saltwater conditions. Installing this kit is quick and straightforward, giving you reliable performance and peace of mind on every trip.

Why Buy OEM

Mercury’s OEM kits are engineered for precision and longevity — built to handle the vibration, heat, and corrosion of real boating conditions. Aftermarket housings often don’t seal correctly or use softer plastics that warp under pressure.

A genuine Quicksilver repair kit fits perfectly, flows properly, and lasts longer — keeping your outboard protected and performing at its best.

FAQ

Q1: What engines fit the Quicksilver 821351A3 kit?
A: It fits Mercury 25–50HP FourStroke carbureted, BigFoot, and Bodensee outboards.

Q2: What’s included in the kit?
A: The kit includes three key components for upper housing repair, including seals and hardware.

Q3: Can I install it myself?
A: Yes. It installs easily using common hand tools and a Mercury service manual.

Q4: Does this work in saltwater?
A: Absolutely. It’s built from corrosion-resistant materials designed for marine environments.

Q5: Why OEM instead of aftermarket?
A: OEM kits are made to Mercury’s exact tolerances — ensuring proper seal, fit, and long-term reliability.