47-8037481 Water Pump Impeller W/Key For Mercury 6 8 209CC 9.8 9.9 HP Outboard

Water Pump Impeller with Key for Mercury Outboard

This water pump impeller with key for Mercury outboard motors moves cooling water through the engine and is a direct replacement for OEM part number 47-8037481.

Overview

The water pump impeller with key for Mercury outboards is essential for keeping 6, 8, 209CC, 9.8, and 9.9 HP motors cool during operation. This water pump impeller is built to replace worn units on Mercury outboards and restore consistent coolant flow. Routine replacement of the water pump impeller helps avoid overheating and costly powerhead damage.

Built For Performance

• Precision-molded rubber vanes deliver reliable water flow across the intended RPM range.
• Corrosion-resistant construction withstands fresh and saltwater conditions.
• Keyed bore engages the pump shaft for positive, slip-resistant rotation.
• Direct replacement fit for Mercury outboard water pump service.
• Compatible with 6, 8, 209CC, 9.8, and 9.9 HP Mercury outboard models.
• Includes the key for a complete impeller replacement.

Fits These Machines

• for Mercury 6HP outboard
• for Mercury 8HP outboard
• for Mercury 209CC outboard
• for Mercury 9.8HP outboard
• for Mercury 9.9HP outboard

On-The-Job Use

• Maintains cooling system output during routine outboard water pump replacement.
• Supports small fishing boats, skiffs, and tenders powered by Mercury outboards.
• Helps prevent overheating while trolling or running at low speeds.
• Suitable for freshwater and saltwater use with appropriate water pump service.

Specs At A Glance

Good To Know

Q: How often should a Mercury outboard water pump impeller be replaced? A: Replace it about every 2 to 3 years or after a season of heavy use to keep the cooling system effective.

Q: Is the key necessary for installing this impeller? A: The key locks the impeller to the drive shaft so it spins correctly, and it must be seated properly during installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.