Mercury – Water Pump Repair Kit | Cooling System Service | Complete 7-Piece Kit | 89980T1

Overview

Running a vintage Mercury or Mariner outboard has its own kind of satisfaction — that familiar tone, the light weight, the simplicity. But even the most reliable old two-stroke needs proper cooling to stay healthy. The Quicksilver 89980T1 Water Pump Repair Kit gives these classic 3.5–9.8 horsepower engines the fresh start they deserve. When your pump is rebuilt with the right parts, you feel it right away: the engine runs cooler, idles steadier, and gives you that little boost of confidence whenever you push off from shore.

Key Features

• Complete 7-piece OEM-grade cooling system repair kit
• Includes gaskets, o-ring, face plate, impeller, key, and water guide tube
• Impeller made from flexible marine elastomer for reliable water flow
• Designed for strong cooling performance across wide temperature ranges
• Meets Mercury Marine OEM specifications for vintage engines

Engine & Boat Compatibility

• Fits vintage Mercury and Mariner 3.5–9.8 horsepower outboards
• Works with classic 2-stroke portable engines commonly used on:
  • Dinghies and tenders
  • Car-toppers and small aluminum fishing boats
  • Canoes and inflatables with clamp-on motors
  • Lightweight utility boats
• Designed to match original Mercury pump system components for older models

Performance & Practical Benefits

A solid water pump is the lifeline of any small two-stroke outboard. When the flow drops even a little temperature climbs quickly, especially at idle or low-speed trolling. The Quicksilver 89980T1 kit gives you everything you need to rebuild the pump back to factory performance.

The elastomer impeller is engineered to stay flexible across a broad range of water and engine temperatures. That flexibility keeps the vanes sealing tightly against the housing, producing strong suction and steady water movement even at low RPM. The bonded hub prevents the common failure where the center insert breaks free, instantly cutting off flow and risking an overheated powerhead.

The included face plate, gaskets, and o-ring create clean, reliable sealing surfaces so the pump can build proper pressure. The water guide tube ensures the flow reaches exactly where the engine needs it. When all parts work together, the engine runs cooler, lasts longer, and performs better on the water.

For vintage Mercury and Mariner owners, a full pump rebuild often brings a noticeable improvement — steadier telltale stream, stronger idle, and cooler running on long slow-speed stretches. It’s one of those small maintenance projects that pays off every time you take the boat out.

Why Buy OEM

Older outboards rely heavily on precise fit and correct material quality. Aftermarket kits often mix components from different suppliers, leading to mismatched tolerances, weak gaskets, or impellers that lose flexibility too quickly. A genuine Quicksilver kit ensures every part aligns exactly the way Mercury designed it decades ago. That means proper flow, proper sealing, and the long-term reliability your classic engine deserves. When you’re dealing with vintage equipment, OEM isn’t just the safe choice — it’s the smart one.

FAQ

Q1: Which engines does this kit fit?

It fits vintage 3.5–9.8 HP Mercury and Mariner outboards.

Q2: What’s included in the kit?

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

Q3: Why rebuild the entire pump instead of replacing the impeller only?

A full rebuild restores sealing surfaces and flow efficiency, preventing temperature issues and long-term wear.

Q4: Is this suitable for saltwater use?

Yes — the materials are designed to handle saltwater when properly flushed.

Q5: Can DIY boat owners install this?

Absolutely. With basic tools and the service manual, most owners can complete the repair.