Mercury – Quicksilver Water Pump Assembly | Cooling System Series | OEM Replacement | 8M6005225

Overview

Any boater who’s run a MerCruiser for a few seasons knows just how much trust gets placed in the cooling system. You can feel it every time you pull away from the dock—the quiet comfort of knowing your engine is staying cool and steady, no matter how hard you push it. The Quicksilver 8M6005225 Water Pump Assembly delivers exactly that kind of confidence. It’s built for the dependable MerCruiser 4.3L platform, and once installed, it becomes one of those pieces you stop thinking about… and that’s the best kind of gear to have under the hatch.

Key Features

• Complete cooling-system water pump assembly designed for MerCruiser 4.3L engines
• Built from marine-grade materials engineered to withstand saltwater, heat, vibration, and long-term exposure
• Includes pump housing and gaskets for a clean, secure installation
• Precision-machined components that meet or exceed Mercury Marine OEM standards
• Designed for proper water flow and cooling pressure under all operating conditions

Engine & Boat Compatibility

This pump assembly fits:

• MerCruiser 4.3L sterndrive engines (serial number range 1A063240–2A528897)
• Common in runabouts, bowriders, deck boats, cuddy cabins, small cruisers, and family sport boats

Whether the boat is used for weekend cruising, watersports, or fishing, the cooling system relies heavily on a properly functioning water pump, making this a key replacement component.

Performance & Practical Benefits

A strong cooling system isn’t just about temperature—it’s about the whole boating experience. With this OEM water pump installed, you’ll notice:

• Smooth, dependable cooling flow that keeps the 4.3L engine running at an ideal temperature
• Steady performance during long idle periods, hard acceleration, or high-speed runs
• Tight, leak-free sealing thanks to precise gaskets and high-quality pump construction
• Improved engine longevity, especially in saltwater conditions where corrosion and heat are constant challenges
• Quiet, vibration-free operation, contributing to that clean MerCruiser feel

Every turn of the impeller helps protect your investment, and having the right pump in place makes all the difference when you’re miles from shore or spending the day pulling the kids on a tube.

Why Buy OEM

There’s simply no substitute for a water pump designed specifically for a MerCruiser engine. Genuine Quicksilver/Mercury parts offer:

• Factory-tested reliability you won’t get from generic replacements
• Correct fitment the first time, without modification or questionable tolerances
• Long-term durability in both saltwater and freshwater settings
• Better performance and fewer callbacks, since cooling components affect the whole engine

If you’ve ever swapped out a cheap aftermarket pump only to replace it again mid-season, you already know why OEM is worth it.

FAQ Section

Q1: Which engines does the 8M6005225 Water Pump Assembly fit?

It’s designed for MerCruiser 4.3L engines within serial numbers 1A063240 through 2A528897.

Q2: What makes this water pump different from aftermarket versions?

OEM pumps meet Mercury’s exact flow, pressure, and durability requirements—aftermarket options often don’t.

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

Check your engine’s serial number and match it with your owner’s manual or Mercury parts guide.

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

Absolutely. It’s engineered specifically for harsh marine environments, including saltwater use.

Q5: Is installation straightforward?

Most boat owners with moderate mechanical skill can install it using standard tools, especially if they follow the manual

• Supersessions
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