Part Number: 47-3023
Sierra 18-3023 Raw Water Pump Impeller
Protect your engine and maintain proper cooling performance with the Sierra 18-3023 Impeller Kit. Designed as a high-quality replacement for a wide range of marine raw water pump systems, this kit restores water circulation and helps prevent overheating in both inboard and sterndrive applications.
The raw water impeller is one of the most important service items on any marine engine. Over time, the flexible rubber vanes wear down from heat, debris, and continuous operation, reducing water flow and cooling efficiency. Replacing the impeller at recommended intervals helps protect internal engine components and keeps your boat operating reliably on the water.
Built using durable marine-grade materials, the Sierra 18-3023 is engineered to withstand harsh marine environments while delivering dependable long-term performance. It’s designed as a direct replacement for compatible OEM pump systems, making installation straightforward and maintenance easier.
Common Engine Fitments
The Sierra 18-3023 impeller kit is commonly used on a variety of MerCruiser, OMC, Crusader, and Volvo Penta marine engines, including:
- MerCruiser 4.3L V6
- MerCruiser 5.0L V8
- MerCruiser 5.7L V8
- MerCruiser 7.4L V8
- OMC Cobra 5.0L and 5.7L
- Crusader 350 CID and 454 CID engines
- Volvo Penta small-block and big-block V8 applications with compatible raw water pumps
These engines are frequently found in boats such as:
- Sea Ray Sundancer and Sport series
- Four Winns Horizon models
- Chaparral SSi and Signature series
- Bayliner Ciera and Capri models
- Malibu Response and Sunsetter
- Supra Sunsport and Launch series
Fitment can vary depending on the raw water pump manufacturer and engine configuration, so confirming compatibility with part number 18-3023 before ordering is recommended.
Key Features
- High-quality marine raw water pump impeller kit
- Restores proper cooling system performance
- Helps prevent overheating and engine damage
- Compatible with MerCruiser, OMC, Crusader, and Volvo Penta applications
- Marine-grade materials built for durability
- Direct replacement for straightforward installation
Why Routine Impeller Service Matters
A worn impeller can reduce cooling efficiency long before it completely fails. Regular replacement helps maintain steady water flow, protects vital engine components, and reduces the risk of unexpected breakdowns.
If you’re servicing a compatible MerCruiser, Volvo Penta, OMC, or Crusader-powered boat, the Sierra 18-3023 impeller kit delivers reliable cooling performance and dependable OEM-style fitment.