Mercury – Water Pump Impeller | Cooling System Component | Rubber Elastomer | 89983T

Overview

There’s something reassuring about knowing your outboard is pulling a strong, steady stream of cooling water every time you fire it up. Whether you’re easing down a river channel, running across a lake before sunrise, or working a nearshore drift, that simple stream tells you the heart of your engine is doing exactly what it should. For Mercury and Mariner 30–70 horsepower outboards, the Quicksilver 89983T Water Pump Impeller is one of those small but vital parts that keeps everything running cool and confident. When the old impeller starts to stiffen or wear from sand and debris, swapping in a fresh OEM replacement is the smartest way to protect your engine and keep your time on the water predictable and stress-free.

Key Features

• Replacement OEM water pump impeller for Mercury and Mariner 30–70 HP outboards
• Made with flexible elastomer vanes for consistent cooling across hot and cold conditions
• Bonded center insert prevents tearing or slippage under load
• Designed for long-lasting durability and high, steady water flow
• Built precisely to Mercury Marine specifications for proper fit and cooling performance

Engine & Boat Compatibility

• Fits 30–70 HP Mercury and Mariner outboards using this impeller style
• Compatible with standard mid-range two-cycle models from multiple production years
• Included as the impeller component within the 89983Q1 repair kit
• Common on:
  • Aluminum fishing boats
  • River jet setups
  • Utility skiffs
  • Older family runabouts
  • Multi-use workboats used in shallow or mixed water conditions

Performance & Practical Benefits

Replacing an impeller might not be exciting, but it’s one of those maintenance habits that can save an engine. When vanes dry, crack, or lose shape, they push less water. That leads to overheating, weaker idle stability, and stress on the powerhead. Installing the 89983T restores that original tight sweep inside the housing, giving you smoother rotation and a healthy, steady water stream you can trust.

The elastomer material used in this impeller handles changing water temperatures without hardening, so it stays flexible during early spring launches and late-season fishing trips. The bonded hub is another quiet advantage — it keeps the vanes from separating under stress, delivering dependable flow even in river bottoms and sandy shallows where debris is more common.

In real-world use, boaters often notice a stronger telltale and more consistent operating temperature shortly after installation. This is especially helpful for owners who run older engines or boats used in silt-heavy water, where cooling parts take more abuse. It’s a small job that pays you back with long-term reliability.

Why Buy OEM

Mercury Marine designed these cooling systems around specific vane stiffness, hub bonding, and clearances. Aftermarket impellers might look similar, but they rarely hold their shape as long or maintain the flow rate Mercury intended. An OEM impeller means proper fit, better protection for your outboard, and fewer surprises out on the water. If you’re running a 30–70 HP Mercury or Mariner, sticking with OEM is simply the smarter choice.

FAQ

Q1: Which engines does this impeller fit?

It fits Mercury and Mariner 30–70 HP outboards that use the 89983T impeller design.

Q2: What makes this different from aftermarket versions?

OEM impellers match Mercury’s exact materials and tolerances, ensuring correct flow and longer life.

Q3: How do I confirm it’s the correct part?

Check your owner’s manual or match the part number to your engine’s cooling system diagram.

Q4: Can it be used in saltwater?

Yes. Just flush the engine after each saltwater trip for best longevity.

Q5: Is installation simple?

Most boat owners can install it with basic hand tools and a service manual.

• Supersessions
  47-20268, 47-89983, 47-89983B, 47-89983T, 47-89983T