Mercury – Quicksilver Water Pump Impeller | Cooling System Component | Marine-Grade Elastomer | 42038Q02

Overview

A dependable impeller is the heart of your outboard’s cooling system. The Mercury Marine 42038Q02 Quicksilver Water Pump Impeller delivers the water flow your engine depends on to stay cool and run efficiently. Designed for Mercury and Mariner 6–15HP TwoStroke outboards and select 8–15HP FourStroke models, this OEM impeller uses flexible, marine-grade rubber that holds its shape under pressure and temperature swings. It’s built to move water smoothly through the pump, keeping your motor protected and performing at its best through every season.

Key Features

• Purpose: Moves cooling water through your engine to prevent overheating.
• Material: Crafted from high-flexibility elastomer that stays pliable through temperature extremes.
• Design Detail: Center insert is bonded to the vanes to prevent tearing and ensure steady water flow.
• Performance: Provides strong, consistent flow for reliable cooling at any speed.
• Durability: Resists cracking, swelling, and fatigue under heat and load.

Engine & Boat Compatibility

• Mercury and Mariner 6–15HP TwoStroke outboards.
• 8–9.9HP FourStroke (2004 & earlier) and 15HP FourStroke (2008 & earlier).
• Perfect for small fishing boats, inflatables, and aluminum runabouts.
• Built for freshwater and saltwater use.

Performance & Practical Benefits

The 42038Q02 impeller provides smooth, dependable cooling by maintaining steady water pressure through the pump housing. Its flexible blades bend and recover with every revolution, moving water efficiently even at low RPMs.

With its bonded insert and durable elastomer vanes, it’s built to last longer and resist tearing — a common failure point in lesser impellers. Replacing this part on schedule helps prevent overheating and ensures your motor runs cool, efficient, and ready for anything the water throws at you.

Why Buy OEM

Mercury’s Quicksilver 42038Q02 is a genuine factory part, engineered specifically for your outboard. Aftermarket versions can look similar but may use harder rubber or slightly off-center molds that reduce water flow or cause early wear.

OEM impellers from Mercury are tested in real marine environments to guarantee proper fit, pressure balance, and cooling performance. Choosing OEM means knowing your impeller will last — and your engine will stay safe.

FAQ

Q1: Which engines does this impeller fit?
It fits Mercury and Mariner 6–15HP TwoStroke, 8–9.9HP FourStroke (2004 & older), and 15HP FourStroke (2008 & older) outboards.

Q2: What’s it made of?
It’s built from a marine-grade elastomer that stays flexible and resists cracking or tearing.

Q3: Why replace it regularly?
An old or damaged impeller can cause overheating. Replacing it every 2 years or 200 hours keeps your engine protected.

Q4: Can it handle saltwater?
Yes — it’s designed for freshwater, saltwater, and mixed conditions.

Q5: Why OEM instead of aftermarket?
OEM impellers are built to Mercury’s exact tolerances, ensuring consistent flow, durability, and proper fit every time.