Mercury – Water Pump Repair Kit | 25–30hp 4-Stroke Series | Composite & Stainless Components | 8M0208905

Overview

If you’ve spent enough time running shallow creeks, easing through backwater channels, or pushing long days on open bays, you know how important a healthy cooling system is. When the water pump starts to fade, you feel it—not always in sound, but in that uneasy sense that something isn’t flowing the way it should. The Quicksilver 8M0208905 Water Pump Repair Kit brings back that peace of mind. It’s the kind of kit you install once and immediately feel better about every mile you run afterward, because you know your Mercury outboard is getting the cooling water it depends on.

Key Features

• Complete kit restores proper water pump performance
• Includes impeller, pump housing, upper and lower housings, face plate, gaskets, seals, and O-rings
• Durable construction for long-term reliability in marine environments
• Designed to maintain cooling efficiency across a wide range of water conditions
• Engineered to Mercury Marine part specifications for optimal fit and performance
• Supports consistent water flow to protect the powerhead from overheating

Engine & Boat Compatibility

This Mercury Marine part fits:

• Mercury and Mariner twenty-five to thirty horsepower four-stroke outboards
• Serial number range zero R zero five one seven one zero and above

Ideal for:

• Small fishing skiffs
• Lightweight jon boats
• Compact pontoons
• Tenders and utility boats
• Portable outboards used in varied freshwater or brackish conditions

Performance & Practical Benefits

Once installed, the 8M0208905 kit brings back the steady, confident cooling that Mercury four-stroke engines are known for. The impeller delivers a firm, consistent push of water, and the new housings create a smooth internal channel that prevents interruptions in flow. You’ll notice quicker temperature stabilization on startup and reliable cooling at both idle and higher throttle.

The components fit cleanly and tighten down with a secure, even feel—no forcing, no guessing. On the water, that translates to a smoother-running engine that stays protected even in weed-filled shallows, sand-stirred channels, or long idle zones. And because the kit includes nearly everything needed, you avoid the frustration of missing seals or worn plates slowing your maintenance routine.

Long-term, this repair kit helps prevent overheating damage, extends impeller life, and gives your outboard a fresh start in one of the most important systems it has.

Why Buy OEM

Using a genuine Mercury Marine part ensures that every component matches the exact dimensions, tolerances, and performance expectations your engine was built around. Aftermarket water pump kits often cut corners in material quality or impeller design, leading to reduced flow or premature wear. With OEM, you get parts that seat correctly, seal tightly, and perform reliably for the entire service interval.

It’s a small investment that protects a much bigger one—your outboard and your time on the water.

FAQ

Q1: Which Mercury engines does the 8M0208905 kit fit?

It fits Mercury and Mariner twenty-five to thirty horsepower four-stroke outboards beginning with serial number zero R zero five one seven one zero.

Q2: How is this kit different from aftermarket versions?

OEM components provide exact fitment, proper impeller stiffness, and long-lasting seals designed for Mercury’s cooling system tolerances.

Q3: How do I confirm this is the correct kit for my engine?

Match your engine’s serial number and horsepower range or verify through your owner’s manual.

Q4: Can this kit be used in both saltwater and freshwater?

Yes. The materials and seals are designed for both environments, though regular maintenance is essential for saltwater use.

Q5: Is installation straightforward?

Most boat owners with basic tools can complete the job. The kit includes all major components so you don’t chase missing parts.