Mercury – Water Pump Repair Kit | Cooling System | Marine-Grade Components | 8M0205802

Overview

When you spend your weekends on the water, you learn quickly that a dependable cooling system is the heartbeat of any outboard. It’s what keeps the engine steady when you’re cruising across open chop or easing into a quiet inlet at sunset. Knowing your water pump is healthy brings a sense of calm — that reassuring feeling that your engine is running cool, smooth, and protected. That’s exactly the peace of mind Mercury Marine part 8M0205802 delivers. With every component matched perfectly to the V6 and V8 platforms, this kit helps you restore that confidence and keep your engine performing the way it should.

Key Features

• Complete cooling-system repair kit for Mercury three-point-four liter V6 and four-point-six liter V8 outboards
• Also fits Mercury Racing V6 and V8 one-hundred-fifty R, two-hundred R, and three-hundred R engines
• Includes water pump impeller, impeller key, face plate, gaskets, seals, and O-rings
• Designed for reliable cooling flow and long-term durability
• Easy installation using existing hardware and common marine tools
• Mercury Marine part number 8M0205802

Engine & Boat Compatibility

This OEM repair kit is designed for:

• Mercury three-point-four liter V6 outboards (one-hundred-seventy-five to three-hundred horsepower)
• Mercury four-point-six liter V8 outboards (one-hundred-seventy-five to three-hundred horsepower)
• Mercury Racing one-hundred-fifty R, two-hundred R, and three-hundred R models

Ideal for:

• Offshore center consoles running long distances at high loads
• Freshwater fishing boats that idle, troll, and burst to plane repeatedly
• Multi-engine rigs that rely on consistent cooling
• Performance boats powered by Mercury Racing engines

Performance & Practical Benefits

A water pump may be small, but it plays a huge role. When the impeller begins to wear, you’ll feel it subtly — a warmer idle, sluggish holeshot, or temperatures creeping higher on long runs. Replacing those components with the Mercury 8M0205802 kit restores the crisp, reliable cooling flow your engine depends on.

The impeller is crafted from flexible marine-grade elastomers that hold their shape and responsiveness across a wide range of temperatures. The face plate and gaskets create a tight, secure seal that keeps water moving through the system smoothly. In real-world use, that means a cooler engine at every RPM, steadier performance in rough water, and fewer surprises on long weekends or offshore runs.

This kit is especially valuable for boaters who put their engines through high-load conditions — towing, offshore fishing, or performance boating. With fresh seals, new gaskets, and a perfectly matched impeller, you’ll feel the engine settle into a clean rhythm again. It’s the kind of maintenance that pays you back instantly with smoother operation and long-term peace of mind.

Why Buy OEM

Cooling systems are no place for guesswork. Aftermarket kits may look similar, but slight differences in impeller stiffness, seal material, or plate thickness can lead to poor cooling performance — and that’s a risk no boater should take. Mercury’s OEM components are engineered to match the exact tolerances, flow demands, and heat conditions of their V6 and V8 platforms.

When you choose OEM, you’re choosing reliability you can count on. The parts fit right, last longer, and protect some of the most advanced outboards on the water.

FAQ

Q1: Which engines does Water Pump Repair Kit 8M0205802 fit?

It fits Mercury three-point-four liter V6 and four-point-six liter V8 outboards from one-hundred-seventy-five to three-hundred horsepower, plus Mercury Racing one-hundred-fifty R, two-hundred R, and three-hundred R engines.

Q2: What makes this kit different from aftermarket options?

All components match Mercury’s exact cooling specifications for flow, fitment, and durability.

Q3: How can I confirm this is the right repair kit for my engine?

Check your owner’s manual or match your engine’s displacement and horsepower to the listed compatibility.

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

Yes — the materials are designed to handle corrosion, minerals, and temperature extremes in any environment.

Q5: Is installation straightforward?

Most boaters familiar with basic maintenance can install this kit using common tools and existing hardware.