Sierra Ballast Impeller Kit 18-30008 for Johnson Outboard Cooling Systems

The Sierra Ballast Impeller Kit, part number 18-30008, is a replacement impeller kit built for the cooling system on Johnson outboard motors. The impeller is the core wear component inside a water pump housing, drawing raw water through the cooling passages to keep the powerhead running at safe operating temperature. Over time, impeller vanes lose flexibility and can crack or shear, leading to reduced water flow and overheating, so replacing the impeller kit is a routine maintenance item for outboard owners who service their own cooling systems.

This kit ships as a compact, ready-to-install unit sized for easy handling and storage aboard the boat or in a service kit. Because it is a genuine Sierra part, it is manufactured to match the fit and function expected for the Johnson outboard cooling system application it is designed for, giving owners a straightforward like-for-like replacement option when performing cooling system maintenance.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-30008
• Product Name: Ballast Impeller Kit
• Category: Johnson Outboard Cooling System
• UPC: 808282388362
• Weight: 0.06 pounds
• Package Dimensions: 4 x 4 x 2 inches

Frequently Asked Questions

What is the Sierra 18-30008 Ballast Impeller Kit used for? It is a replacement impeller kit for the cooling system on Johnson outboard motors, supplying the water pump with a new impeller to maintain proper raw water flow for engine cooling.

Is 18-30008 a genuine Sierra part number? Yes, 18-30008 is the Sierra manufacturer part number for the Ballast Impeller Kit, so it is a genuine Sierra replacement part rather than a generic substitute.

What are the package dimensions of the 18-30008 impeller kit? The Sierra Ballast Impeller Kit 18-30008 has package dimensions of 4 x 4 x 2 inches, making it a compact part that is easy to store with onboard spares.

How much does the Sierra 18-30008 impeller kit weigh? This impeller kit weighs 0.06 pounds, reflecting its small, lightweight construction as a single water pump component kit.

Does this kit fit Johnson outboard motors? Yes, the Sierra 18-30008 Ballast Impeller Kit is categorized for the Johnson outboard cooling system, making it intended for use in that cooling system application.

Why would I need to replace an outboard impeller? An outboard impeller's rubber vanes wear down or crack over time, reducing water flow through the cooling system; the Sierra 18-30008 kit provides a replacement impeller to restore proper cooling performance.

What is included in the 18-30008 Ballast Impeller Kit? The kit is sold as the Ballast Impeller Kit under Sierra part number 18-30008, providing the impeller component needed for the outboard cooling system service.

How do I identify the correct impeller kit for my Johnson outboard? Confirm the part number 18-30008 matches your existing Sierra cooling system component before ordering, since this kit is specific to that part number and application.

Is the Sierra 18-30008 impeller kit a UPC-verified product? Yes, the Sierra Ballast Impeller Kit 18-30008 carries UPC 808282388362 for verified product identification.

Can I install this impeller kit myself? The Sierra 18-30008 Ballast Impeller Kit is designed as a standard replacement part for the water pump in the Johnson outboard cooling system, suitable for routine maintenance by owners comfortable servicing their outboard's cooling system.