REPLACEMENTKITS.COM Water Pump Impeller Kit for Johnson F6B-9 — 12-Blade Neoprene with Brass Spline, O-ring & Gasket

If your boat’s cooling system is underperforming or leaking, this kit from REPLACEMENTKITS.COM supplies the essential parts to bring your raw-water pump back to reliable operation. The set contains a molded 12-blade impeller, an O-ring, and a gasket sized to fit a broad range of Johnson, Jabsco, Indmar and Volvo Penta applications, offering a direct-fit aftermarket alternative to factory parts.

What exactly is included and what are the impeller's specifications?

The package provides a single impeller plus the sealing components required for a standard rebuild of the pump housing. The impeller features a 12-blade profile and a brass-splined hub to engage the drive shaft precisely.

• Impeller: 12 flexible blades, approximately 2-1/4" diameter, 1-15/16" width.
• Hub: 5/8" brass spline insert for secure shaft engagement.
• Seals: One replacement O-ring and one gasket matched to the pump face.

Which pumps and part numbers does this kit replace?

This kit is designed as a direct replacement for several OEM numbers and is compatible with specific models commonly found in inboard/outboard and sterndrive setups. It suits owners looking to swap worn parts without modifying the pump.

• Replaces Johnson: 09-812B-1, 09-812B.
• Replaces Indmar: S685007, 685001; Sierra: 18-3306; Yanmar: 119773-42600.
• Compatible with Johnson F6B-9, 10-24232-1, 10-24915-01 and Jabsco 50410-1201 pumps.

How durable is the kit and what materials are used?

The impeller is molded from premium neoprene rubber for flexibility and resistance to heat and cavitation, while the hub uses solid brass for corrosion-resistant strength. These materials help the part withstand repeated service intervals in marine environments.

• Impeller compound: High-grade neoprene for blade resilience and sealing.
• Hub insert: Solid brass spline reduces wear on the drive shaft interface.
• Seals: Heat- and fluid-resistant O-ring and gasket for a proper head seal.

How do I know this will fit my boat and how simple is installation?

Compatibility covers a wide array of sterndrive and inboard/outboard boats, including many Indmar-powered models and several Volvo Penta applications. Installation is straightforward for anyone comfortable removing the pump housing and replacing the impeller and seals.

• Check your OEM part number against listed replacements to confirm fit.
• Basic tools required: screwdrivers, pliers, and a torque wrench for reassembly.
• Follow manufacturer torque specs and priming steps to avoid dry-running on first start.

Who is this for: This impeller kit is aimed at boat owners, mechanics and service shops that need a reliable, affordable aftermarket replacement for Johnson F6B-9 style pumps. It’s especially useful for those who maintain Indmar Monsoon, Hammerhead or Raptor engines, or owners of boats from Supra, Moomba, Mastercraft, Tige and other brands that use the listed pump assemblies. If you want a direct-fit impeller with durable materials and the sealing pieces needed to complete the job in one purchase, this kit provides a practical solution with American-owned company support.