Mercury – Water Pump Pulley | Serpentine Belt Cooling System Component | Steel, Corrosion-Resistant Finish | 8M0153706

Overview

Anyone who spends real time on the water knows how much trust you place in your engine’s cooling system. When the sun is beating down, the chop picks up, and you’re pushing through long stretches, you want to know that your engine is staying cool and steady without you giving it a second thought. That’s where dependable parts really earn their keep. The Mercury Marine part number 8M0153706 Water Pump Pulley is one of those small but essential components you rely on every single outing—quietly keeping your cooling system moving, mile after mile, tide after tide.

Key Features

• Drives the seawater pump to maintain consistent cooling
• Precision-formed steel construction for long-term durability
• Corrosion-resistant coating engineered for marine environments
• Designed for serpentine belt systems
• Direct-fit replacement meeting Mercury Marine OEM specifications
• Includes pulley only

Engine & Boat Compatibility

This pulley is built for a broad range of MerCruiser engines equipped with serpentine belt systems, including:

• MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L sterndrive and inboard engines (1997 and newer)
• Not compatible with MerCruiser 6.2L MPI engines beginning with serial number 2A456613
• Ideal for runabouts, cruisers, cabin boats, tow-sport vessels and larger multi-purpose stern-drive setups

If your boat relies on a serpentine belt cooling system, this pulley plays a big role in keeping temperatures stable.

Performance & Practical Benefits

When a water pump pulley is working the way it should, you barely notice it—and that’s exactly the point. A worn or corroded pulley, however, can show itself quickly: belts squeal, cooling becomes inconsistent, and suddenly you’re eyeing the temperature gauge more than the horizon. This pulley brings everything back into balance. Its smooth, true rotation helps ensure your belt tracks correctly, keeping the pump turning at the right speed so your cooling water flows as it should.

On the water, you’ll feel the difference in a more predictable engine temperature, steadier performance under load, and reduced belt chatter. The steel body and marine-ready finish resist rust even in salty, humid climates, giving you one less thing to worry about during long boating seasons. And because it’s built to Mercury OEM standards, installation is straightforward and the fit is tight and secure—no shimming, no guesswork, no unnecessary downtime.

Why Buy OEM

Boaters who maintain their own engines know that not all parts are created equal. When you choose an OEM-grade Mercury component, you’re getting:

• A pulley engineered specifically for your cooling system
• Higher durability than many aftermarket options
• Marine-tested materials that resist corrosion and wear
• A part designed to fit correctly the first time
• Long-term reliability that saves money and frustration

It’s the difference between a quick, clean maintenance job and a weekend spent tracking down vibration issues caused by a poorly made replacement.

FAQ

Q1: Which engines does this pulley fit?

It fits MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, 7.4L and 8.2L engines with serpentine belts (1997+), except certain later 6.2L MPI models.

Q2: What makes this pulley different from aftermarket versions?

Its construction, coating and tolerances match Mercury’s original engineering, offering better longevity and smoother belt operation.

Q3: How do I confirm it’s the right part?

Match your engine model and serial number to the compatibility list in your manual or existing pulley specifications.

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

Yes—its corrosion-resistant finish is designed for the harshest marine environments.

Q5: Is installation simple for most boat owners?

If you’re comfortable with belt-driven engine components, installation is straightforward with common tools.