Mercury – Upper Water Pump Repair Kit | Cooling System | Marine Composite & Rubber | 99157T2

Overview

There’s a certain calm that settles in once you know your cooling system is moving water the way it should. Out on the water—whether you’re pushing through a long channel or easing across a glass-smooth bay—you rely on that steady flow more than anything else. When the pump is healthy, the engine feels confident, strong, and ready for whatever run you’ve planned. That’s why I lean on Mercury Marine parts like the 99157T2 kit. It brings that same peace of mind every boater chases: the feeling that your motor is protected beneath the surface, quietly doing its job.

Key Features

• Complete upper water pump repair kit for restoring dependable cooling performance
• Includes pump housing assembly, gaskets, plates, o-rings, impeller, key, face plates, and guide sleeve
• Comes with water tube guide sleeve and gear lube fill and vent screw o-rings
• Marine-grade composite and rubber components built for long, consistent service life
• Designed to maintain strong water flow and engine protection under heavy use

Engine & Boat Compatibility

• Fits select Mercury and Mariner 8–25 horsepower two-stroke and four-stroke outboards
• Compatible with specific eight and nine-point-nine horsepower four-stroke models
• Designed for fifteen horsepower Mercury BigFoot four-stroke engines
• Also fits select twenty and twenty-five horsepower two-stroke engines
• Common on small fishing boats, tenders, jon boats, pontoons, and lightweight runabouts

Performance & Practical Benefits

When your water pump is in top shape, you can feel it. The engine stays cool and steady, even in tight marsh channels or during long slow-speed runs. The impeller bites cleanly, pushing a reliable stream of cooling water through the powerhead. There’s no hesitation, no guessing—just a smooth flow you can trust.

This kit is built to restore that level of confidence. The impeller flexes evenly, the plates seat tightly, and the seals keep everything secure. Once installed, you’ll notice the engine settling into a comfortable rhythm, especially after extended idle periods or when throttling up after fishing a spot. It’s the kind of maintenance that pays you back every time you hit the water, helping your outboard run cooler, last longer, and perform the way it was meant to.

Because the kit includes all major components, you won’t find yourself hunting for missing seals or mismatched hardware. Everything fits the way an original Mercury Marine part should—tight, precise, and hassle-free.

Why Buy OEM

Any seasoned boater will tell you that a water pump isn’t something you take chances on. With a genuine Mercury Marine part like the 99157T2 kit, you’re getting components engineered for exact fitment and proper cooling flow. Aftermarket options might look similar, but they often fall short where it matters most: durability, consistency, and long-term engine protection.

Choosing OEM means fewer surprises, fewer breakdowns, and cooling performance you can count on season after season. It’s not just practical—it’s the smart way to protect the heart of your outboard.

FAQ

Q1: Which engines does the 99157T2 kit fit?

It fits select Mercury and Mariner eight to twenty-five horsepower two-stroke and four-stroke outboards, including BigFoot models.

Q2: What makes this kit different from aftermarket pump kits?

It’s engineered by Mercury Marine for exact water flow, precise fitment, and long-term durability.

Q3: How do I confirm it’s the right kit for my motor?

Check your owner’s manual or serial number range to ensure proper compatibility.

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

Yes, it’s built for all typical marine environments.

Q5: Is installation straightforward?

Most boat owners with basic tools can complete the repair by following manual guidance.