Mercury – Water Pump Impeller | Cooling System | Premium Elastomer | 8M0186795

Overview

Every boater knows the quiet relief that comes from glancing at the temperature gauge and seeing everything right where it should be. No unexpected spikes, no uneasy buzz in the back of your mind—just steady, dependable cooling doing its job while you focus on the horizon. That kind of confidence doesn’t come by chance; it comes from parts that work hard behind the scenes. The Quicksilver 8M0186795 Water Pump Impeller is one of those small-but-critical components that keeps Mercury 25 and 30hp EFI FourStroke outboards running cool, smooth, and protected season after season. When your impeller is healthy, the whole engine feels better—especially when you’re miles from the dock.

Key Features

• Designed for Mercury 25/30hp EFI FourStroke outboards (serial number 1R154758 and higher)
• Constructed from premium elastomers for durability and flexible performance
• Provides consistent cooling flow across wide temperature ranges
• Includes impeller only, ideal for routine maintenance or quick replacement
• Meets or exceeds Mercury Marine OEM specifications

Engine & Boat Compatibility

This OEM-quality impeller is compatible with:

• Mercury 25hp EFI FourStroke outboards
• Mercury 30hp EFI FourStroke outboards
• Engines within serial range 1R154758 and up

Common boat types that rely on these engines include:

• Aluminum fishing boats
• Dinghies and tenders
• Jon boats
• Lightweight skiffs
• Small pontoons and utility rigs

If you depend on a compact, efficient Mercury FourStroke to get you around quietly and reliably, this impeller is built for your setup.

Performance & Practical Benefits

A strong cooling system is one of the most important safeguards your engine has. With this impeller installed, you’ll notice:

• Smooth, steady water flow that keeps temperatures in the safe zone
• Improved protection against overheating, especially during heavy loads
• A tight, reliable fit that maintains pressure and flow consistency
• Better thermal efficiency thanks to the impeller’s flexible, resilient elastomers
• Peace of mind knowing your cooling system is working exactly as Mercury intended

Changing an impeller also brings that fresh, tight feel back to the water pump—a subtle but important improvement you’ll notice on long runs and hot days.

Why Buy OEM

Choosing OEM for something as essential as your cooling system is simply smart boating. Here’s why:

• It ensures the exact flow rate your engine was designed for
• OEM elastomers withstand marine heat cycles and water exposure far better than budget alternatives
• You’ll spend less time troubleshooting and more time on the water
• It’s cost-effective in the long run—an overheating event costs far more than the right part
• Fitment is precise, installation is simple, and performance is predictable

Experienced boaters stick with Quicksilver because they know what works.

FAQ Section

Q1: Which engines does this impeller fit?

It fits Mercury 25hp and 30hp EFI FourStroke outboards with serial numbers 1R154758 and higher.

Q2: What makes this impeller better than aftermarket versions?

It uses premium elastomers, meets Mercury’s exact standards, and delivers consistent cooling flow the engine was designed around.

Q3: How do I know if this is the correct replacement?

Match your serial number and consult your owner’s manual for confirmation.

Q4: Is it suitable for freshwater and saltwater use?

Yes—its materials are engineered for both environments.

Q5: Is installation manageable for most boat owners?

Definitely. With basic tools and your manual nearby, most boaters can complete the job confidently.