WATER PUMP IMPELLE WITH KEY For Mercury Mariner Marine 47-803748 47-8M0135803

Water Pump Impeller with Key for Mercury and Mariner

This water pump impeller with key is a direct replacement for Mercury and Mariner marine outboard engines, referencing OEM cross-reference numbers 47-803748 and 47-8M0135803 for fitment.

Overview

This water pump impeller with key moves coolant through the engine cooling system to protect against overheating. Designed for Mercury and Mariner marine powerheads, this water pump impeller replaces worn factory components to restore water flow. The included key locks the impeller onto the pump shaft for positive drive.

Built For Performance

• Includes drive key for secure mounting to the water pump shaft
• Direct replacement referencing OEM 47-803748 and 47-8M0135803
• Built for marine cooling system operation
• Restores coolant flow for Mercury and Mariner outboards

On-The-Job Use

• During water pump replacement for Mercury outboard engines
• During water pump replacement for Mariner outboard engines
• When servicing marine cooling systems to prevent overheating
• As routine maintenance for worn impellers

Specs At A Glance

Good To Know

Q: How does a water pump impeller with key work? A: The impeller rotates inside the pump housing to draw water through the cooling system. The key locks the impeller to the shaft so it spins without slipping.

Q: Why replace a water pump impeller on a marine engine? A: Worn impellers reduce coolant flow and can cause the engine to overheat. Regular replacement keeps the cooling system working reliably.

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