MERCURY OUTBOARD WATER PUMP IMPELLER 18-8923 47-161541 47-16154 1 25HP 30HP EFI

Water Pump Impeller for Mercury

This water pump impeller for Mercury outboard engines replaces OEM cross-reference numbers 18-8923, 47-161541, and 47-16154. It is designed to circulate cooling water through the engine block to prevent overheating during operation. Fits Mercury 25HP and 30HP EFI outboard models.

Overview

This water pump impeller for Mercury is a direct replacement part for maintaining proper engine cooling. It ensures the raw water pump delivers consistent flow to protect 25HP and 30HP EFI outboards from heat damage. The impeller is built to match original specifications for reliable performance.

Built For Performance

• Constructed from durable, flexible rubber composite that resists heat and wear
• Precisely molded to match OEM dimensions for a tight seal
• Stainless steel insert hub provides corrosion resistance
• Designed for reliable water flow at all engine speeds
• Reduces risk of engine overheating during extended runs

Fits These Machines

• for Mercury 25HP EFI
• for Mercury 30HP EFI

On-The-Job Use

• Ideal for routine water pump rebuilds on small Mercury outboards
• Used in freshwater and saltwater boating environments
• Common on fishing boats, skiffs, and light runabouts
• Replaces worn impellers to prevent loss of cooling flow

Specs At A Glance

Good To Know

Q: How often should I replace the impeller in my Mercury outboard? A: Typically every 100 hours of operation or once a year, whichever comes first. Regular replacement prevents overheating and extends engine life.

Q: Will this impeller fit a Mercury 25HP carbureted model? A: This impeller references OEM part numbers for EFI models; verify your engine's serial number and cross-reference before ordering.

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