Mercury – Quicksilver Water Pump Impeller Repair Kit | For 8–9.9HP 4-Stroke Outboards | 803748Q01

Overview

A healthy water pump means a cool, reliable engine — and the Mercury Marine 803748Q01 Quicksilver Water Pump Impeller Repair Kit makes it easy to keep it that way. Designed for 2005 and newer Mercury and Mariner 8–9.9HP 4-Stroke outboards, this 6-piece kit includes everything you need to restore proper water circulation and cooling performance. Each component is made to Mercury’s strict OEM standards, ensuring a precise fit and long-lasting durability. It’s a simple, effective way to protect your outboard and extend its life on the water.

Key Features

• Purpose: Restores your water pump’s efficiency for steady cooling and long engine life.
• Complete Kit: Includes impeller, gaskets, and plates — all key parts in one box.
• Performance: Designed for consistent water flow and higher cooling efficiency.
• Ease of Use: Installs easily using basic hand tools and standard procedures.

Engine & Boat Compatibility

• Mercury 8HP and 9.9HP 4-Stroke outboards (2005 and newer)
• Mariner 8HP and 9.9HP 4-Stroke outboards (2005 and newer)

Performance & Real-World Benefits

The 803748Q01 impeller kit helps your outboard stay cool under pressure. Over time, impellers wear down and lose flexibility, reducing water flow and risking engine overheating. This complete OEM kit restores full cooling efficiency, giving your engine the consistent water flow it needs.

Everything you need for the job is included — no searching for extra seals or plates. Each piece is built for the demands of marine use, resisting heat, friction, and corrosion to keep your cooling system performing at its best.

Why Choose Mercury OEM

The Quicksilver 803748Q01 is a genuine Mercury Marine part, engineered specifically for your engine. Aftermarket kits might look similar but often use inferior rubber or mismatched components that can fail early or reduce water pressure.

Mercury’s OEM impeller kits are built from premium materials tested to withstand marine heat, salt, and wear. It’s the same quality Mercury installs in new outboards — ensuring dependable cooling and long-term peace of mind.

FAQ

Q1: What engines does this fit?
It fits 2005 and newer Mercury and Mariner 8–9.9HP 4-Stroke outboards.

Q2: What’s included in the kit?
You’ll get 6 components — impeller, gaskets, and plates for a complete pump rebuild.

Q3: Why replace the impeller?
Old or damaged impellers can cause poor cooling flow, leading to overheating and costly engine repairs.

Q4: Is this an OEM product?
Yes — it’s a factory-tested Mercury Marine part designed for precision and durability.

Q5: How often should it be replaced?
Typically once per season or every 100 hours, depending on use and water conditions.