Description

The Johnson Pump 09-812B-1 Impeller Kit is a complete raw water pump service kit designed for Johnson F6 series pumps used in marine engine cooling systems. This kit includes a high-performance MC97 neoprene impeller along with sealing components to restore proper cooling water flow and protect your engine from overheating.

Built with a durable marine-grade elastomer and a brass spline-drive hub, this impeller delivers excellent flexibility, long service life, and reliable performance in both freshwater and saltwater environments.

This is one of the most common impellers used in Indmar, Volvo Penta, PCM, and Marine Power engines, making it a critical maintenance part for inboard applications.

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Key Features

• Genuine Johnson Pump impeller kit
• MC97 marine-grade neoprene construction
• 12-blade flexible impeller design
• Brass hub with spline-drive shaft
• Designed for maximum cooling flow and durability
• Includes gasket(s), O-ring, and hardware (kit dependent)

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Engine Compatibility

Indmar Marine Engines

Commonly used on:

• Monsoon 320 / 325 / 330 / 335 / 340 / 350
• Hammerhead 365 / 380 / 383 / 400
• Raptor 6.2L / 400 / 450 / 575
• 5.7L, 6.0L, 6.2L, 8.1L platforms

Found in MasterCraft, Malibu, Supra, Moomba, Axis boats

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Volvo Penta Engines

Compatible with select:

• 4.3L, 5.0L, 5.7L MPI / GI / GXi / OSI
• D3 diesel engines

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PCM / Crusader / Marine Power

• PCM inboard engines
• Crusader V8 engines
• Marine Power cooling systems

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Other Engine Applications

Also used across:

• Yanmar diesel engines
• Yamaha marine applications
• Toyota marine engines

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Pump Compatibility (Primary Fitment)

Fits Johnson Pump F6 series pumps, including:

• F6B-9
• F6B-902
• Johnson pump assemblies:
  • 10-13208 series
  • 10-24232 / 10-24432 series
  • 10-245xx series

Designed specifically for Johnson F6 crankshaft-driven raw water pumps

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Serial Number Fitment Notice

Fitment depends on:

• Pump model (F6 required)
• Shaft type (spline drive)
• Engine configuration

Always confirm compatibility using your pump model or engine serial number before ordering.

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Impeller Specifications (Fitment Critical)

• Diameter: 2-1/4″ (57 mm)
• Width: 1.9″ (48 mm)
• Shaft: Spline drive (16 mm)
• Blade Count: 12 blades
• Material: MC97 neoprene / elastomer

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What’s Included in the Kit

• Impeller
• Pump cover gasket
• O-ring
• Hardware / lubricant (varies by kit version)

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When This Part Needs Replacement

Replace the impeller if you notice:

• Reduced cooling water flow
• Engine overheating
• Cracked or missing vanes
• Reduced performance under load

Recommended service interval: every 100 hours or annually

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Installation Notes

• Lubricate impeller before installation
• Ensure spline alignment is correct
• Install with proper vane direction
• Replace all gaskets and seals
• Inspect pump housing and wear plate

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Alternate / Superseded Part Numbers

OEM Cross References

• Johnson Pump: 09-812B-1 / 09-812B
• Superseded by: 09-812BT-1

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Major Cross References

• Indmar: 685007 / S685007
• Volvo Penta: 3584350
• Yanmar: 119773-42600
• Yamaha: 6TA-12457-00

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Aftermarket Cross References

• Jabsco: 13554-0001
• Sierra: 18-3306
• Mallory: 9-45704
• PCM: RP061018

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Shipping

Shipping: Ships same or next day for fast Canada wide shipping.

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Parts Desk Insight

This is the go-to impeller for Indmar-powered boats—if you’re working on a wake boat (MasterCraft, Malibu, Supra), this is one of the most common service parts you’ll need