Description

The Johnson Pump 09-1027B-10 Impeller Kit is a complete raw water pump service kit designed for Johnson F5 and F5B series pumps used in marine engine cooling systems. This kit includes a precision-molded impeller along with sealing components and lubricant to restore proper water flow and ensure reliable engine cooling.

Manufactured from durable MC97 marine-grade neoprene/EPDM compound, this impeller delivers maximum flow efficiency and long service life in both freshwater and saltwater environments. Replacing a worn impeller helps maintain consistent cooling performance and protects your engine from overheating and damage.

This impeller is commonly used in Volvo Penta and other marine engines equipped with crank-driven Johnson F5 pumps, making it a critical maintenance item.

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Key Features

• Genuine Johnson Pump impeller kit
• MC97 marine-grade neoprene / EPDM construction
• 12-blade flexible impeller design
• Splined hub for secure fitment
• Designed for maximum water flow and durability
• Includes gasket, O-ring, and lubricant for full service

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Engine Compatibility

Johnson Pump Applications

Fits Johnson raw water pumps including:

• F5 series pumps
• F5B pump assemblies

Commonly used on Volvo Penta and GM-based marine engines with crank-driven pumps

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Serial Number Fitment Notice

Fitment depends on:

• Pump model (F5 / F5B required)
• Shaft spline configuration
• Engine application

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

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Impeller Specifications

• Outer Diameter: 2.25″ (57 mm)
• Width: 1.24″ (31.8 mm)
• Shaft: Splined hub
• Blade Count: 12
• Material: MC97 neoprene / EPDM

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What’s Included in the Kit

• Impeller
• Pump cover gasket
• O-ring
• Lubricant packet

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When This Part Needs Replacement

Replace the impeller if you notice:

• Reduced or no cooling water flow
• Engine overheating
• Cracked, missing, or stiff vanes
• Reduced performance under load

Recommended service interval: every 100 hours or annually

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Installation Notes

• Lubricate impeller before installation
• Install with correct vane direction
• Replace all included seals and gaskets
• Inspect pump housing and wear surfaces
• Check for broken vane debris in system

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Alternate / Superseded Part Numbers

OEM Cross References

• Johnson Pump: 09-1027B-10
• Replaces: 09-1027B-1

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Cross References

• Volvo Penta: 21951348
• Jabsco: 1210-0001 (application dependent)
• Sherwood: Equivalent F5 applications (verify)

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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 one of the most common Johnson F5 impellers and a direct cross to several Volvo Penta applications. The key identifier is the 12-blade design and spline hub—if those match, you’re on the right part