Mercury – Water Pump Repair Kit | Cooling System Service | Complete 7-Piece Kit | 89981Q1

Overview

There’s something reassuring about the steady, cool-running feel of a small four-stroke outboard. When it’s maintained well, an 8 or 9.9 horsepower Mercury or Mariner has this quiet confidence to it the kind of motor you trust for long drifts, slow trolling passes, or exploring hidden stretches of shoreline. The Quicksilver 89981Q1 Water Pump Repair Kit keeps that confidence alive by restoring the heart of your cooling system. With fresh components throughout the housing, your engine can move water the way it was designed to, giving you peace of mind every time you leave the ramp.

Key Features

• Complete 7-piece water pump repair kit
• Includes gaskets, o-rings, face plate, drive key, impeller, and water guide tube
• High-flex elastomer impeller maintains performance across temperature swings
• Engineered for strong flow rates and consistent cooling
• Meets Mercury Marine OEM specifications for 8–9.9 HP 4-stroke outboards

Engine & Boat Compatibility

• Fits Mercury and Mariner 8 HP and 9.9 HP 4-stroke outboards with a standard gearcase
• Common on:
  • Aluminum fishing boats
  • Dinghies and tenders
  • Small pontoons
  • Inflatable boats and canoes with auxiliary motors
  • Lightweight skiffs and portable setups
• Designed for cooling systems that use Mercury/Quicksilver pump components of this model family

Performance & Practical Benefits

A water pump rebuild is one of the best things you can do for a small four-stroke outboard, especially if the engine has a few seasons behind it. Pumps in this size class work at low RPM often, which means they depend heavily on the impeller’s flexibility and the integrity of the sealing surfaces. When gaskets harden or the impeller begins to stiffen, cooling performance drops quickly.

The Quicksilver 89981Q1 kit replaces every wear component inside the pump housing, restoring both pressure and flow. The elastomer impeller flexes smoothly at all speeds from gentle idle to long full-throttle runs ensuring a cool, steady temperature across the entire powerband. The included face plate and gaskets provide clean sealing surfaces, preventing pressure loss that leads to overheating.

The water guide tube ensures the flow is delivered exactly where the motor needs it. This is especially helpful on four-stroke engines that operate quietly and often mask early symptoms of low cooling pressure. With everything refreshed, you’ll notice a stronger telltale stream and a more stable idle temperature, even during long hours of slow-speed operation.

For anglers and recreational boaters alike, a proper pump rebuild helps the engine start easier, run smoother, and last much longer. It’s one of the simplest investments you can make to protect your motor.

Why Buy OEM

Cooling systems aren’t a place to experiment with generic parts. Aftermarket kits might fit loosely, use inconsistent gasket materials, or supply impellers that lose flexibility too quickly. Quicksilver’s OEM kit is engineered exactly to Mercury’s specifications correct dimensioning, proper elastomer compounds, and components that work together without guesswork. For boaters who want reliability, not surprises, OEM is the only way to go.

FAQ

Q1: Which engines does this kit fit?

It fits Mercury and Mariner 8–9.9 HP 4-stroke outboards with a standard gearcase.

Q2: What comes in the kit?

Seven components: gaskets, o-rings, face plate, water guide tube, impeller, and drive key.

Q3: Why rebuild the pump instead of replacing just the impeller?

A full rebuild restores pressure, sealing, and long-term cooling efficiency.

Q4: Can this be used in saltwater?

Yes the materials are engineered for marine environments when properly flushed.

Q5: Is installation beginner-friendly?

Most boaters can handle it with basic tools and the service manual.

• Supersessions
  47-89981Q1, 47-89981Q1