Mercury – Quicksilver Water Pump Impeller Repair Kit | For 9.9HP 4-Stroke BigFoot Outboards | 803748Q02

Overview

A reliable cooling system is key to keeping your outboard performing its best, and the Mercury Marine 803748Q02 Quicksilver Water Pump Impeller Repair Kit gives you everything you need to maintain it. Built for 2005 and newer Mercury 9.9HP 4-Stroke BigFoot outboards, this 3-piece OEM kit replaces worn water pump parts to restore proper water flow and cooling efficiency. It’s made from durable, marine-grade materials that stand up to years of use, helping you avoid overheating and extend the life of your engine.

Key Features

• Purpose: Restores cooling system performance by replacing key water pump components.
• Complete Kit: Includes impeller, plate, and water guide tube — the essentials for a reliable rebuild.
• Performance: Ensures strong water flow for steady engine cooling under all conditions.
• Ease of Use: Simple, direct-fit installation with common tools.

Engine & Boat Compatibility

• Mercury 9.9HP 4-Stroke BigFoot outboards (model year 2005 and newer)

Performance & Real-World Benefits

The 803748Q02 repair kit keeps your motor’s cooling system in top shape by restoring consistent water pressure and flow. Over time, impellers lose flexibility and efficiency, which can cause overheating or reduced performance. Replacing the impeller and related components helps your outboard maintain proper temperature and reliable operation on every trip.

This 3-piece kit has everything needed for a quick, clean repair. It’s built to Mercury’s OEM standards for exact fit and lasting durability, ensuring your engine stays protected season after season.

Why Choose Mercury OEM

The Quicksilver 803748Q02 is a genuine Mercury Marine kit, engineered to meet the same standards as the parts installed at the factory. Aftermarket versions may not match Mercury’s precision tolerances or use materials designed for marine use, leading to early wear or poor cooling.

Mercury OEM parts are tested for heat, pressure, and saltwater resistance — guaranteeing consistent performance, dependable cooling, and a longer service life for your engine.

FAQ

Q1: What engines does this kit fit?
It fits 2005 and newer Mercury 9.9HP 4-Stroke BigFoot outboards.

Q2: What’s included in the kit?
You’ll get three components — a replacement impeller, plate, and water guide tube.

Q3: Why replace the impeller?
The impeller is a wear part that can lose performance over time, leading to poor cooling or overheating.

Q4: Is this easy to install?
Yes — it’s a direct-fit OEM kit that installs easily with basic hand tools.

Q5: Why choose OEM instead of aftermarket?
Mercury OEM parts provide precise fit, reliable cooling, and proven durability, unlike generic replacements that often wear out faster.