Sierra Impeller 18-30778 for Volvo Penta Water Pumps

The Sierra Impeller 18-30778 is a replacement water pump impeller engineered for Volvo Penta water pump applications. It is produced in an OEM-approved ISO9001 factory, with the compound for each Sierra impeller formulated based on size and application to deliver consistent, reliable performance in your engine's raw water cooling circuit. As the pumping element inside the water pump housing, the impeller's flexible vanes flex and release with each rotation to draw in and circulate cooling water, protecting the engine from overheating.

This impeller is built from a metal-reinforced construction and is offered in a distinctive green and purple color combination, making it easy to identify during service. It is sold as a single unit, ready to install as a direct replacement during routine water pump maintenance or when addressing reduced water flow, overheating, or a worn-out impeller. Sierra impellers are engineered to cover a wide range of outboard, inboard, and sterndrive engine applications, and the 18-30778 is designated for use in Volvo Penta water pumps.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-30778
• Category: Volvo Penta Water Pumps & Impellers
• Material: Metal
• Color: Green Purple
• Weight: 0.43 pounds
• Item Dimensions: 3 x 3 x 4 inches
• Number of Pieces: 1
• UPC: 808282339753

Fitment

Designed for Volvo Penta water pump applications.

Frequently Asked Questions

What engine application is the Sierra 18-30778 impeller designed for? The Sierra 18-30778 impeller is designed for Volvo Penta water pump applications, serving as the pumping element that circulates raw cooling water through the engine.

What is the Sierra 18-30778 impeller made of? It is made of a metal-reinforced construction, formulated by Sierra based on the size and application of the specific impeller.

How much does the 18-30778 impeller weigh? The Sierra 18-30778 impeller weighs 0.43 pounds.

What are the dimensions of the 18-30778 impeller? The item measures 3 x 3 x 4 inches.

How many impellers come in one package? One Sierra 18-30778 impeller is included per package, sold as a single unit.

What color is the Sierra 18-30778 impeller? This impeller has a green and purple color combination, which helps distinguish it during installation and service.

Is the Sierra 18-30778 an OEM part or aftermarket? The 18-30778 is a Sierra-branded replacement impeller produced in an OEM-approved ISO9001 factory, rather than a part carrying the original engine manufacturer's branding.

When should I replace the water pump impeller on my Volvo Penta engine? An impeller like the Sierra 18-30778 should be replaced when it shows signs of wear, cracked or missing vanes, or when the engine's raw water cooling flow has decreased, as part of routine water pump maintenance.

What is the UPC for the Sierra 18-30778 impeller? The UPC for the Sierra 18-30778 impeller is 808282339753.

Does the Sierra 18-30778 impeller fit outboard engines? No, the 18-30778 impeller is designated for Volvo Penta water pump applications rather than general outboard water pumps.