Part Number: 47-3079
Sierra 18-3079 Impeller Kit
Maintain reliable cooling system performance with the Sierra 18-3079 Impeller Kit. Designed as a high-quality replacement for select marine raw water pump systems, this impeller kit helps restore proper water circulation and protects your engine from overheating in demanding marine conditions.
The raw water impeller is a critical component of your engine’s cooling system. As the flexible rubber vanes age, they can become brittle, cracked, or worn from heat, debris, and continuous operation. Replacing the impeller at regular service intervals helps maintain cooling efficiency, protect engine components, and reduce the risk of costly breakdowns on the water.
Built with durable marine-grade materials, the Sierra 18-3079 impeller kit is engineered to meet or exceed OEM specifications for dependable fitment and long service life. Designed for use in both freshwater and saltwater environments, it provides reliable performance for a wide range of inboard and sterndrive applications.
Common Engine Fitments
The Sierra 18-3079 impeller kit is commonly used on marine engines equipped with compatible raw water pump systems, including:
- MerCruiser 4.3L V6
- MerCruiser 5.0L V8
- MerCruiser 5.7L V8
- MerCruiser 350 MAG
- Volvo Penta 5.0Gi and 5.7Gi engines
- OMC Cobra 5.0L and 5.7L applications
- Crusader 350 CID and 454 CID engines
These engines are frequently found in:
- Sea Ray sport boats and cruisers
- Chaparral bowriders and cuddy cabins
- Four Winns Horizon models
- Regal sport boats
- Malibu Response and Sunsetter models
- Correct Craft Ski Nautique boats
The 18-3079 kit is commonly used in raw water cooling systems where maintaining consistent water flow is essential for safe engine operating temperatures and long-term reliability.
Fitment can vary depending on raw water pump model and engine serial number, so confirming compatibility with part number 18-3079 before ordering is recommended.
Key Features
- High-quality marine raw water pump impeller kit
- Helps restore proper cooling system performance
- Designed for MerCruiser, Volvo Penta, OMC, and Crusader applications
- Marine-grade materials for durability and long service life
- Helps reduce the risk of overheating and cooling system failure
- Direct replacement for easy installation
Why Replace Your Marine Impeller?
A worn impeller can lose efficiency long before complete failure occurs. Routine replacement helps maintain proper cooling water flow, protects internal engine components, and reduces the chance of unexpected downtime during boating season.
If you’re servicing a compatible inboard or sterndrive engine, the Sierra 18-3079 impeller kit delivers dependable cooling performance and OEM-style reliability you can trust.