Part Number: 47-3056
Sierra 18-3056 Impeller Kit
Keep your engine cooling system operating at peak performance with the Sierra 18-3056 Impeller Kit. Designed as a high-quality replacement for select marine raw water pumps, this impeller kit helps maintain proper water circulation and protects your engine from overheating during demanding conditions on the water.
The raw water impeller is one of the most important maintenance components in any marine engine. Over time, the rubber vanes can wear, harden, or crack from heat, debris, and continuous operation. Replacing the impeller at regular service intervals helps restore cooling efficiency, improve reliability, and reduce the risk of costly engine damage caused by overheating.
Manufactured using durable marine-grade materials, the Sierra 18-3056 impeller kit is engineered to meet or exceed OEM specifications for fit, performance, and long service life. Designed for both freshwater and saltwater environments, it delivers dependable operation across a wide range of marine applications.
Common Engine Fitments
The Sierra 18-3056 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 18-3056 kit is commonly used in raw water cooling systems where steady water flow is essential for maintaining safe engine temperatures and long-term engine reliability.
Fitment can vary depending on raw water pump model and engine serial number, so confirming compatibility with part number 18-3056 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 straightforward 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, protect internal engine components, and reduce the chance of unexpected breakdowns during boating season.
If you’re servicing a compatible inboard or sterndrive marine engine, the Sierra 18-3056 impeller kit delivers dependable cooling performance and OEM-style reliability you can trust.