Mercury – Water Pump Repair Kit | Cooling System Series | OEM Components | 8M0113799

Overview

Every boater knows that a good day on the water starts with a cool, steady-running engine. When your outboard’s water pump is healthy, the whole boat feels different — the idle is calmer, the throttle responds cleaner, and you’re not glancing at the temperature gauge every few minutes. The Mercury 8M0113799 Water Pump Repair Kit brings that feeling back. It’s the kind of kit you keep on hand because you know how important reliable cooling is, especially when you’re miles from the dock and counting on your engine to get you home.

Key Features

• Complete repair kit for restoring proper water pump function
• Includes impeller, upper and lower housing, drive key, face plate, gaskets, water tube, and seals
• Designed for Mercury 30-125hp 2-stroke and 4-stroke outboards
• Fits Force 75-120hp 2-stroke outboards
• OEM-grade components for long-lasting cooling performance

Engine & Boat Compatibility

• Mercury 30–125 horsepower 2-stroke outboards
• Mercury 30–125 horsepower 4-stroke outboards
• Force 75–120 horsepower 2-stroke outboards
• Common on aluminum fishing boats, pontoons, bay boats, small runabouts, and utility skiffs
• Ideal for engines used in shallow water, high-heat environments, or heavy seasonal use

Performance & Practical Benefits

A dependable water pump is the backbone of your engine’s cooling system, and rebuilding it with a complete kit like this one makes a noticeable difference. Once installed, you’ll feel the engine settle into a smoother, more confident rhythm — no surging temperatures, no warning buzzers, just steady cooling flow even at low speeds.

The impeller is flexible yet firm, designed to keep pumping efficiently even after hours of idling through no-wake zones or pushing hard across choppy water. The housings and gaskets fit tightly, restoring the kind of secure seal that prevents leaks and pressure drops. Everything feels solid during installation: parts align cleanly, bolts seat without fuss, and the kit gives you everything you need so you’re not hunting down extra pieces.

Whether you fish long hours or cruise the lake with the family, this kit helps your outboard stay cool, protected, and ready for long days on the water.

Why Buy OEM

Cooling system parts aren’t something you gamble with. Mercury Marine parts are engineered to match your outboard’s water passages, housing tolerances, and operating temperatures exactly. Aftermarket pieces may fit “close enough,” but they often use softer materials, lower-grade seals, or imprecise molding.

With Mercury Marine part number 8M0113799, you get the correct components, the correct materials, and the correct dimensions — the first time. It’s cost-effective in the long run because it prevents overheating damage, extends impeller life, and keeps your engine running at the temperature it was designed for.

FAQ

Q1: Which engines does the Mercury 8M0113799 Water Pump Repair Kit fit?

It fits Mercury 30–125hp 2-stroke and 4-stroke outboards, plus Force 75–120hp 2-stroke engines.

Q2: What makes this kit better than aftermarket versions?

OEM kits use higher-grade materials, precise housing dimensions, and tested components that match Mercury cooling system specs.

Q3: How do I know if this is the correct kit for my motor?

Match your engine’s horsepower and model family with the part number, or refer to your owner’s or service manual.

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

Yes — the components are built to handle both environments reliably.

Q5: Is installation straightforward?

Most boat owners with basic tools can complete the job, especially if they’ve serviced a water pump before