Mercury – Impeller for 8/9.9 Horsepower FourStroke Outboards | Cooling System Component | Black Marine Elastomer | 8M0214945

Overview

There’s something reassuring about knowing your outboard is cooling the way it should. You can feel it in the smooth hum of the engine when you throttle up, and in the easy way it settles into idle after a long run. The impeller may be a small part, but it’s one of those pieces that gives you quiet confidence every time you head out. With the Mercury Marine Impeller 8M0214945, that confidence comes naturally. It’s built to keep the water flowing steady, and on the water, steady is everything — especially when you’re far from the dock with nothing but open shoreline ahead.

Key Features

• Provides reliable cooling water delivery for Mercury FourStroke engines
• Manufactured from premium marine elastomers for durability and flexibility
• Black elastomer finish maintains proper vane shape across changing temperatures
• Designed specifically for eight and nine point nine horsepower Mercury FourStroke outboards (two thousand five and newer)
• Includes impeller only for simple, direct replacement
• Engineered to meet or exceed Mercury Marine original equipment specifications
• Mercury Marine part number 8M0214945

Engine & Boat Compatibility

• Fits Mercury FourStroke eight horsepower models (two thousand five and newer)
• Fits Mercury FourStroke nine point nine horsepower models (two thousand five and newer)
• Commonly used on dinghies, jon boats, small fishing skiffs and compact inflatables
• Well-suited for lightweight runabouts where efficient cooling is essential for consistent performance

Performance & Practical Benefits

When your impeller is fresh and working as intended, the engine temperature stays right where it should — steady, predictable and safe. This impeller keeps the cooling system breathing smoothly, which helps the engine hold its power whether you’re pushing through a headwind or slipping along a quiet riverbank. The elastomer vanes flex naturally, even in cold water, so you get a consistent seal inside the pump housing. That steady flow makes a noticeable difference during slow trolling, hard acceleration or long-distance cruising. It also brings peace of mind when running in silty creeks or shallow flats where cooling demands can spike quickly. Because the material resists stiffening and cracking, you won’t find yourself dealing with sudden failures or weak flow after a single season. Installation is straightforward, which makes seasonal service more relaxed and predictable.

Why Buy OEM

Cooling components aren’t the place to gamble on almost-right parts. A genuine Mercury Marine part gives you the exact fit and blade geometry your engine was designed around. That means proper water volume, consistent vane contact and long-term reliability that aftermarket alternatives often struggle to match. Choosing OEM keeps maintenance simple and predictable — no surprises, no sizing issues, no early failures. Seasoned boaters stick with Mercury’s original equipment because it’s built to handle real-world use, including saltwater, temperature changes and long hours with the motor working hard. When you’re out there relying on your engine, the smart choice is the part that was engineered for it from day one.

FAQ

Q1: Which engines does the Impeller 8M0214945 fit?

It fits Mercury FourStroke eight and nine point nine horsepower outboards from two thousand five onward.

Q2: What makes this impeller better than aftermarket versions?

The materials, vane design and fitment are engineered specifically for Mercury cooling systems, ensuring stronger and more consistent water flow.

Q3: How do I know if this is the right replacement for my setup?

If your outboard is an eight or nine point nine horsepower Mercury FourStroke from two thousand five or newer, this is the correct Mercury Marine part.

Q4: Can it be used in both saltwater and freshwater?

Yes — the elastomer material performs reliably in both environments and resists long-term wear.

Q5: Is installation straightforward for most boat owners?

Yes. With basic maintenance skills, most boaters can replace this impeller during routine service without complications.