Mercury – Quicksilver 8M0199643 Water Pump Repair Kit | Cooling System Components | Marine Composite/Metal Mix | 8M0199643

Overview

There’s a certain comfort that comes from knowing your engine’s cooling system is ready for the long haul. When you’re running across open water or easing along a shallow creek, you want that steady, reassuring flow of cooling water moving exactly the way it should. The Quicksilver Water Pump Repair Kit, part number 8M0199643, brings that peace of mind back into your maintenance routine. It gives you everything you need in one place, so you’re not scrambling for missing parts or hoping the impeller holds together for one more weekend.

For many boaters, replacing an impeller isn’t glamorous — it’s simply the kind of upkeep that keeps a good engine healthy. This kit makes the job feel straightforward, organized, and dependable.

Key Features

• Complete water pump repair kit designed for Mercury 25 to 30 horsepower EFI outboards
• Includes impeller, key, liner, guide plate, two gaskets, dowel pin, and retainer
• Impeller elastomers engineered for flexibility across a wide temperature range
• Helps keep the engine cooling system performing at peak efficiency
• Designed for secure sealing, reliable pressure, and long-term durability

Engine & Boat Compatibility

• Fits Mercury 25 to 30 horsepower three-cylinder EFI outboards
• Compatible with Mercury Jet and SeaPro outboards within the same horsepower range
• Applicable for engines with serial number 1R154758 and higher
• Common on small aluminum fishing boats, jon boats, compact pontoons, lightweight skiffs, and utility craft

Performance & Practical Benefits

You can feel the difference a healthy water pump makes. The engine idles smoother, stays cooler under load, and responds more confidently when you ask for power. This kit restores that steady, secure flow you depend on, and the components fit cleanly without guesswork. The impeller’s flexibility helps it maintain contact and pressure, even as temperatures swing from chilly spring mornings to hot midsummer afternoons.

When everything is installed, the cooling system feels tight and predictable. No sudden temperature spikes or worrying warning tones — just a steady stream and a motor that stays happy. The durable liner and guide plate help maintain proper alignment, and the included gaskets give you a strong seal without fuss.

This is one of those maintenance tasks that pays you back every time you leave the dock. It keeps overheating at bay, protects your investment, and helps your boat run like it should.

Why Buy OEM

When it comes to the cooling system, cutting corners never pays off. A genuine Mercury Marine part is engineered with the exact tolerances your outboard requires, and that precision shows up in cooler temperatures, fewer failures, and consistent reliability. Aftermarket kits might fit loosely, wear faster, or use materials that swell or stiffen over time.

Choosing OEM means you get components that last, fit correctly the first time, and stand up to real-world use. It is the kind of practical, no-nonsense choice seasoned boaters make because they’ve seen what happens when a cooling system fails at the wrong moment.

FAQ

Q1: Which Mercury engines does this Water Pump Repair Kit fit?

It fits Mercury 25 to 30 horsepower three-cylinder EFI, Jet, and SeaPro outboards with serial numbers 1R154758 and up.

Q2: What makes this kit different from aftermarket versions?

The materials, tolerances, and elastomer flexibility are engineered specifically for Mercury cooling systems, giving you better protection and longevity.

Q3: How do I know if this is the right kit for my engine?

Check your serial number and horsepower range. If your outboard matches the listed specifications, this is the correct Mercury Marine part.

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

Yes. The components are designed to withstand both environments and resist wear from temperature and water changes.

Q5: Is installation straightforward for most boat owners?

Most do-it-yourself boaters find the process clear and manageable, especially with the complete set of components included in the kit.