Part Number: 47-32761
Sierra 18-3276-1 Impeller Kit
Keep your marine cooling system operating reliably with the Sierra 18-3276-1 Impeller Kit. Designed as a high-quality replacement for select raw water pump applications, this impeller kit helps maintain proper water circulation and protects your engine from overheating during long days on the water.
The raw water impeller is one of the most important maintenance items in any marine engine. Over time, the flexible rubber vanes can wear, crack, or lose efficiency due to heat, debris, and continuous operation. Replacing the impeller at recommended service intervals helps restore cooling performance and reduce the risk of expensive engine damage caused by overheating.
Built using durable marine-grade materials, the Sierra 18-3276-1 impeller kit is engineered for dependable performance in both freshwater and saltwater environments. Designed to meet or exceed OEM specifications, it provides reliable fitment and straightforward installation for routine cooling system maintenance.
Common Engine Fitments
The Sierra 18-3276-1 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 series
- Regal sport boats
- Malibu Response and Sunsetter models
- Correct Craft Ski Nautique boats
The 18-3276-1 kit is commonly used in raw water cooling systems where consistent water flow is essential for maintaining safe engine operating temperatures.
Fitment can vary depending on raw water pump model and engine serial number, so confirming compatibility with part number 18-3276-1 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 prevent overheating and cooling system failures
- Direct replacement for straightforward installation
Why Replace Your Marine Impeller?
A worn impeller can reduce cooling efficiency long before complete failure occurs. Routine replacement helps maintain proper water flow, protects internal engine components, and reduces the chance of unexpected breakdowns on the water.
If you’re servicing a compatible sterndrive or inboard marine engine, the Sierra 18-3276-1 impeller kit delivers dependable cooling performance and OEM-style reliability you can trust.