Mercury – Water Pump Repair Kit | 15–25HP 2-Stroke Outboards | Quicksilver | 85089T4

Overview

Every boater knows that when your cooling system fails, your day on the water ends fast. The Mercury 85089T4 Water Pump Repair Kit is the kind of part that keeps that from happening — quietly doing its job so your outboard can do its best. Designed for Mercury and Mariner 15–25 horsepower 2-stroke outboards, this kit restores your water pump’s performance, protecting your engine from heat and the wear caused by sand, silt, and debris.

It’s the kind of reliability that seasoned boaters appreciate. When your engine runs smooth, cool, and steady, you can focus on what matters — the tug of a fish, the calm of open water, or the hum of a well-tuned motor beneath you.

Key Features

• Complete water pump repair kit for restoring cooling efficiency

• Fits Mercury and Mariner 15–25 horsepower 2-stroke outboards

• Includes gaskets, o-rings, plates, impeller, and impeller key

• Engineered to handle abrasives like silt and sand for longer service life

• Designed for easy installation using common tools

• Meets Mercury Marine OEM standards for fit, flow, and reliability

Engine & Boat Compatibility

• Fits Mercury and Mariner 15–25HP 2-stroke outboards

• Works on a range of light-duty fishing boats, runabouts, and inflatables

• Ideal for both tiller and remote-steer configurations

• Compatible with freshwater and saltwater applications

• Recommended for engines showing reduced cooling flow or impeller wear

Performance & Practical Benefits

The Mercury 85089T4 Water Pump Repair Kit brings your cooling system back to life. Every piece in this kit is built for marine-grade performance, ensuring your engine maintains consistent water flow and stable operating temperature. You’ll notice smoother idling, reliable starting, and the confidence that your motor won’t overheat even on long runs or shallow water days.

The impeller, gaskets, and seals are designed to resist heat, corrosion, and the damage caused by fine grit or debris. Once installed, the flow is strong, steady, and efficient — protecting your powerhead and extending engine life. The fit is exact, the feel is solid, and the improvement is immediate.

Most boaters can handle the installation in an afternoon with standard tools. And once it’s done, you’ll have that satisfying assurance that your cooling system is built back to factory standards. It’s a simple repair that makes a big difference in how your engine performs and how long it lasts.

Why Buy OEM

Buying a genuine Mercury Marine part is about protecting your engine the right way. The 85089T4 Water Pump Repair Kit isn’t just another set of parts — it’s the same precision-engineered design used in Mercury’s factory assemblies. Aftermarket kits can’t match the tolerances, materials, or flow performance Mercury builds into every component.

Choosing OEM means every gasket fits tight, every o-ring seals right, and every impeller moves water at the rate your engine was designed for. It’s a small investment that prevents major problems down the line — overheating, corrosion, and premature wear. For boaters who want to spend more time cruising and less time wrenching, OEM is the only real choice.

FAQ

Q1: Which Mercury engines or systems does the Water Pump Repair Kit fit?
It’s made for Mercury and Mariner 15–25HP 2-stroke outboards, covering both short and long shaft models.

Q2: What makes this part different from aftermarket alternatives?
Mercury’s OEM components are tested for real-world durability and engineered for perfect flow and fit — something aftermarket kits rarely achieve.

Q3: How do I know if this is the correct replacement for my setup?
Check your owner’s manual for part number 85089T4, or match it to your existing pump assembly.

Q4: Can this be used in both saltwater and freshwater applications?
Yes, it’s built with corrosion-resistant materials that hold up in any marine environment.

Q5: Is installation straightforward for most boat owners?
Definitely. Most experienced boaters can replace the old pump with this kit using common tools and standard maintenance steps.