Mercury – Water Pump Repair Kit | Cooling System Rebuild | Multi-Piece OEM Kit | 89983T1

Overview

Keeping a mid-range Mercury outboard running cool isn’t just about performance — it’s about trust. When you’re pushing through a shallow creek, drifting a river mouth, or cruising across the lake, you’re counting on that outboard to stay steady and dependable. Over time, though, sand, silt, and fine debris slowly wear away the inner surfaces of the water pump. That’s when you start to notice a weaker telltale or rising temps. The Mercury 89983T1 Water Pump Repair Kit gives you the chance to reset everything back to factory condition. It’s a complete, OEM-engineered way to restore the pump, protect the powerhead, and keep your outboard running cool no matter where the day takes you.

Key Features

• Full OEM water pump repair kit for Mercury and Mariner 30–70 HP two-stroke outboards
• Fits Mercury 30 HP Jet Drive outboards within specified serial ranges
• Includes gaskets, o-rings, face plate, drive key, impeller, and seat assemblies
• Durable elastomer impeller for consistent cooling in varied temperatures
• Designed to improve water flow, restore pump efficiency, and protect the engine
• Built to precise Mercury Marine specifications for reliability and correct fit

Engine & Boat Compatibility

This kit fits a wide range of Mercury and Mariner outboards, including:

• 30 HP Jet
  • USA serial 0C159200–0G589999
• 35 HP TwoStroke
  • USA 6445653+
  • BEL 9384476+
  • CAN 7209608+
• 40 HP TwoStroke
  • All 2-cylinder engines through 1983
  • 4-cylinder engines (USA 0C159200+, BEL 9570790+)
• 45 HP TwoStroke
  • 4-cylinder
• 50 HP TwoStroke
  • 4-cylinder with plastic water pumps
• 50–60 HP TwoStroke
  • 3-cylinder engines (USA 6428681–0D000749; BEL 9385911–9683054; CAN 7208333+)
• 70 HP TwoStroke
  • 3-cylinder engines (USA 4977157–6428680; AUS 8050200+; BEL 9196961–9385910; CAN 7110998–7208332)

Common boat applications:

• Aluminum fishing rigs
• River jet boats
• Utility skiffs
• Small runabouts
• Workboats and shallow-water setups

Performance & Practical Benefits

A complete pump rebuild does more than just fix a worn impeller — it restores the entire cooling system to proper efficiency. Fresh gaskets seal cleanly. A new face plate gives the impeller a smooth surface to sweep against. The drive key grips firmly, ensuring the vane rotation stays strong and uniform. All these details work together to push a solid, steady stream of cooling water, which translates to smoother running, cooler operation, and more confidence at the helm.

For boaters who fish shallow rivers or run through sandy bottoms, this kind of maintenance is essential. Abrasives carve grooves into plates and housings and can slowly weaken water flow even if the impeller looks “okay.” Replacing the full stack of parts in this kit eliminates hidden weak points and restores the pump to its intended performance.

Why Buy OEM

OEM parts are designed with the exact tolerances and materials Mercury engines were built around. That means the impeller stiffness, pump clearances, and gasket fit all match the original engineering — something aftermarket parts rarely achieve. Using a Mercury-branded repair kit ensures your outboard cools properly, lasts longer, and stays as dependable as the day you bought it.

FAQ

Q1: Which engines does the 89983T1 kit fit?

It fits Mercury and Mariner 30–70 HP two-stroke outboards and the Mercury 30 HP Jet within the listed serial ranges.

Q2: Why choose an OEM repair kit over aftermarket?

OEM components maintain correct flow rates, durability, and fit, protecting your engine from overheating.

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

Match your horsepower and serial number range or check your owner’s manual for the part number.

Q4: Can I use this in saltwater?

Yes — just flush the engine after each saltwater run.

Q5: Is installation easy?

With basic tools and a service manual, most boat owners can install this kit themselves.