Mercury – Water Pump Upper Repair Kit | Verado Series | Composite & Stainless Steel Construction | 8M0078858

Overview

There’s a certain comfort that comes from knowing the heart of your cooling system is built to take whatever the water throws at it. Anyone who’s run a Mercury Verado offshore knows the feeling — you want every part beneath the cowl to be dependable, quiet, and steady. This water pump upper repair kit brings that kind of confidence back to your engine. It’s the kind of part you trust on long runs, when the shoreline fades and all you hear is the hum of a motor that’s cooling exactly the way it should.

Key Features

• Complete upper water pump repair kit for restoring proper cooling flow
• Durable composite and Stainless Steel components for long service life
• Precision-formed housings and plate engineered to Mercury Marine standards
• Includes water impeller, upper and lower housings, face plate, gaskets, drive key, face seal, seal carrier, and water tube coupling
• Designed for reliable, tight sealing to maintain consistent water pressure

Engine & Boat Compatibility

• Built for Mercury Verado six-cylinder outboards
• Fits most 200–300 horsepower four-stroke Verado models
• Common on offshore fishing boats, center consoles, bay boats, and performance pontoons
• Suitable for both recreational and commercial Verado applications

Performance & Practical Benefits

A healthy cooling system changes the entire feel of an engine. With this kit installed, you’ll notice a smooth, steady flow that keeps temperatures right where they belong. There’s no guessing, no second-guessing — just a motor that stays cool even when you’re pushing through chop or idling for hours along a shoreline. Components fit cleanly and lock into place with the kind of precision that makes the job straightforward, even if you’re doing the work at home. The materials hold up to harsh environments, resisting corrosion and wear so you can focus on the run, not the pump.

Why Buy OEM

Genuine Mercury Marine parts always feel like the smarter choice in the long run. They fit right the first time, they last, and they’re engineered around the exact cooling demands of your engine. Aftermarket kits may look similar on the surface, but they rarely match the tight tolerances Mercury builds into every component. With an OEM kit like this, upkeep stays simple, performance stays consistent, and you avoid the headaches that come from mismatched parts. It’s the kind of practical choice seasoned boaters make without thinking twice.

FAQ

Q1: Which Mercury engines does the Water Pump Upper Repair Kit 8M0078858 fit?

It’s designed for Mercury Verado six-cylinder outboards in the 200–300 horsepower range.

Q2: What makes this part different from aftermarket versions?

OEM Mercury Marine parts are engineered to exact tolerances and tested in real-world marine conditions, so they tend to last longer and seal more reliably.

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

Check your engine’s serial number and verify your model falls within the compatible Verado line. If you’re unsure, most Mercury dealers can confirm it quickly.

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

Yes, the materials and construction hold up well in both environments.

Q5: Is installation straightforward?

Most experienced boat owners can handle it with basic tools, but a technician can install it quickly if you prefer professional service.