Johnson Pump 09-707B-1 MC97 Impeller Kit (Sherwood 15000K Replacement)

The Johnson Pump 09-707B-1 MC97 Impeller Kit 09-707B-1 is a high-performance impeller kit designed as a direct, premium replacement for the Sherwood 15000K. Engineered with Johnson's proprietary MC97 rubber compound, this impeller is a critical component for engine cooling systems, offering superior durability and thermal stability compared to standard neoprene alternatives.

The MC97 Engineering Advantage

The MC97 (EPDM-based) compound is specifically formulated to withstand the harsh environment of modern marine engines.³ It provides excellent "shape memory," ensuring the blades maintain a tight seal against the pump housing for reliable self-priming.⁴ MC97 is also highly resistant to the heat and chemical additives often found in cooling water, significantly reducing the risk of blade failure and engine overheating.

Key Features:

• Direct Sherwood Replacement: Specifically designed to replace the Sherwood 15000K used in many Cummins, Caterpillar, and John Deere marine engines.

• Premium MC97 Material: Offers a longer service life and better resistance to "set" (blade deformation) than traditional rubber impellers.

• Complete Kit: Includes the necessary O-rings and gaskets required for a watertight seal during installation.

• Reliable Self-Priming: The flexible 12-blade design creates an immediate vacuum to pull cooling water into the system at startup.

• Stable Cooling: Ensures a consistent flow rate across a wide range of engine RPMs to maintain optimal operating temperatures.

Technical Specifications:

• Part Number: 09-707B-1

• Cross Reference: Sherwood 15000K, Cummins 3916720, Kohler 359978

• Material: MC97 (High-Grade EPDM)⁸

• Outer Diameter: 2.56" (65 mm)

• Inner Diameter (Shaft): 0.63" (16 mm)

• Width: 2.01" (51 mm)

• Drive Type: Key Drive

• Number of Blades: 12

Why Choose the 09-707B-1 over Neoprene?

For diesel engines and high-performance gasoline inboards, the  Johnson Pump 09-707B-1 MC97 Impeller Kit 09-707B-1 is the preferred choice. The MC97 material handles the higher internal temperatures of modern engine rooms without becoming brittle. By replacing your impeller with a Johnson MC97 kit, you are investing in the same technology used by top-tier engine manufacturers globally.

Maintenance Tip:

Always inspect your old impeller for missing blades. If a blade has broken off, it is vital to trace the cooling lines and find the fragment (usually caught in the heat exchanger or oil cooler) to prevent future blockages and overheating.