Part Number: 47-3047
Sierra 18-3047 Raw Water Pump Impeller Kit
Keep your marine engine protected from overheating with the Sierra 18-3047 Impeller Kit. Designed as a high-quality replacement for several OEM water pump systems, this kit restores proper cooling water circulation and helps maintain reliable engine temperatures under load.
The raw water impeller is one of the most important maintenance components on any inboard engine. Over time, the rubber vanes can wear down, harden, or crack from heat and continuous use, reducing water flow and increasing the risk of overheating. Replacing the impeller at regular service intervals helps extend engine life and prevent costly repairs. Sierra builds the 18-3047 kit using durable marine-grade rubber compounds and corrosion-resistant materials designed to handle harsh boating conditions.
This kit is engineered as a direct replacement for several popular Sherwood, Jabsco, Mallory, and Volvo Penta pump systems, making installation straightforward on compatible applications. Cross references include Sherwood 10615K, Jabsco 18948-0001, Mallory 9-45706, and Volvo Penta 835874.
Common Engine Fitments
The Sierra 18-3047 impeller kit is commonly used on:
- Crusader 305 CID marine engines
- Crusader 350 CID marine engines
- Crusader 454 CID marine engines
- PCM Ford and GM inboard engines with compatible Sherwood pumps
- Volvo Penta AQ190A
- Volvo Penta AQ240A
- Select OMC Cobra and Sherwood raw water pump applications
These engines are widely found in classic inboard ski boats, cruisers, and stern drive applications from brands including:
- Correct Craft / Nautique
- MasterCraft
- Supra
- Malibu
- Sea Ray
- Four Winns
- Chaparral
Fitment can vary by raw water pump style and engine configuration, so confirming compatibility with part number 18-3047 before ordering is recommended.
Key Features
- High-quality marine raw water pump impeller kit
- Helps restore proper cooling system performance
- Prevents overheating and premature engine wear
- Compatible with Crusader, PCM, Volvo Penta, and Sherwood systems
- Includes gaskets and sealing components for installation
- Built from durable marine-grade materials for long service life
Why Routine Impeller Service Matters
A worn impeller can reduce cooling efficiency long before complete failure occurs. Routine replacement helps maintain proper water circulation, protects internal engine components, and reduces the chance of overheating-related breakdowns on the water.
If you’re servicing a compatible Crusader, PCM, Volvo Penta, or Sherwood-equipped marine engine, the Sierra 18-3047 impeller kit delivers dependable cooling performance and OEM-style fitment you can trust.