Mercury – Sea Pump Kit | Cooling System Component | Marine-Grade Construction | 8M0139995

Overview

Every boater knows that a reliable cooling system isn’t just about performance—it is peace of mind. When the water is choppy, the wind is pushing you sideways, and you are easing the throttle up to settle into a steady run, you want to know your engine is staying cool without complaint. The Mercury 8M0139995 Sea Pump Kit brings that kind of quiet confidence. Built for the MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L MPI engines with manual drain, this pump keeps the heartbeat of the boat steady, even in harsh saltwater conditions. It is one of those parts you trust because you can feel the difference the moment everything starts flowing the way it should.

Key Features

• Fully assembled sea water pump designed for select MerCruiser MPI engines
• Built from durable, marine-grade materials engineered for saltwater use
• Meets or exceeds all Mercury Marine original equipment specifications
• Designed for consistent cooling flow and long-term reliability
• Manufactured to handle abrasive, high-demand marine environments
• Direct OEM replacement for dependable fit and performance
• Ideal for preventative maintenance or complete pump replacement

Engine & Boat Compatibility

• Fits MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L MPI sterndrive and inboard engines
• Not compatible with MerCruiser 6.2L MPI engines serial number 2A456613 and higher
• Suitable for cruisers, sport boats, family runabouts, and fishing vessels
• Works in both freshwater and saltwater environments
• Designed specifically for engines equipped with a manual drain system

Performance & Practical Benefits

A cooling pump may be tucked out of sight, but its job is front and center every moment the boat is running. The 8M0139995 kit is engineered to deliver strong, steady water flow so your engine maintains the temperatures it was built for—no fluctuations, no surprises. On the water, that translates to a smoother idle, a more responsive throttle, and a sense of security when you are miles from the dock.

The pump comes fully assembled, which takes the stress out of installation. You will notice the tight, precise fit right away, and once everything is bolted down, the housing and impeller work together to deliver consistent performance. Even in salty, abrasive coastal waters, the kit resists corrosion and wear, keeping your engine protected season after season. Everything feels more controlled, more settled, and more trustworthy—exactly what you want in your stern drive’s cooling system.

Why Buy OEM

When it comes to cooling system components, aftermarket shortcuts rarely pay off. A genuine Mercury Marine part fits correctly the first time, maintains factory-level flow rates, and reduces the chance of overheating or premature failure. The 8M0139995 Sea Pump Kit is built to handle exactly what your MerCruiser engine demands. Choosing OEM means fewer replacements, fewer headaches, and more time on the water enjoying the boat instead of troubleshooting it.

FAQ

Q1: Which engines does the 8M0139995 Sea Pump Kit fit?

It fits MerCruiser 4.3L, 5.0L, 5.7L, and 6.2L MPI engines with a manual drain, except 6.2L MPI engines serial number 2A456613 and up.

Q2: What makes this pump different from aftermarket options?

Its materials, flow design, and durability meet Mercury’s original equipment standards, giving you better long-term protection.

Q3: How can I confirm this is the correct part for my engine?

Check your serial number and compare it with the compatibility notes in your owner’s manual.

Q4: Can it be used in saltwater and freshwater?

Yes, it is engineered specifically to withstand saltwater corrosion while performing flawlessly in freshwater as well.

Q5: Is installation straightforward?

Most boaters familiar with maintenance will find installation manageable thanks to the fully assembled pump design.