The genuine Johnson MC97 flexible impeller is suitable for general water-pumping duties such as engine cooling, water transfer, wash down and bilge water pumping purposes. The Johnson flexible pump impeller is designed to be installed to some of the F5 range of Johnson Pumps which suits the impeller dimensions listed below.

MC97 has been developed to meet new environmental regulations for rubber manufacturing processes and will replace the regular Johnson neoprene impeller compound. The development of MC97 has also resulted in an extended service life of the impeller compared to impellers in neoprene.

The Johnson flexible pump impeller has twelve blades and is supplied complete with gaskets, O-ring, lubrication gel and instruction manual to aid installation of the impeller into the flexible impeller pump.

The Johnson 09-1027B-1 can be used to replace the Jabsco 1210-0001 Europe and USA flexible impeller. For applications containing diesel or light oils, use Johnson nitrile impeller 09-1027B-9.

It is highly recommended to make sure you use an original pump impeller for your flexible impeller pump as this will ensure that the quality complies with the performance and dimension requirements for each pump type. Johnson Pump impellers are manufactured in strict compliance with the pump specifications set by the engine manufacturers.

Brand Johnson
Primary Construction MC97
Suitable For Mermaid|Nanni|Thornycroft|Vetus|Yanmar
Impeller Shaft Diameter 16mm
Number of Impeller Blades 12
Construction MC97
Diameter 57.1mm, ID: 16mm
Drive Type Spline Drive
Model 09-1027B-1
Replaces Impellers: Jabsco 1210-0001, Volvo 3855546, 825940, 860203 & 875811, Yanmar 129470-42530 & 129470-42530, Onan 132-0162, Perkins 0460038
Suitability Some F5 Johnson Pumps
Depth 31.5mm (1-1/4")

How to remove an old impeller:
Remove the impeller with slip joint pliers or a Johnson Pump Impuller
How to fit a new impeller:
Lubricate the shaft and the inside of the pump body and the end cover. Use Johnson Pump Lubrication to help develop prime and prevent damage from dry-running the pump at initial start-up. Mount the impeller by making a pushing and twisting movement in the rotating direction. Lubricated impellers should not be stored for extended periods of time. The engine should be run after installation of a new impeller to wash out the lubrication. These recommendations apply to any service work on the pump and its components that require the use of lubrication inside the pump for assembly and start-up.
Warning! Do not use any petroleum-based products to lubricate the inside of the pump. Only use Johnson Pump Lubrication. Other products can damage the impeller, which will damage the pump and lead to engine failure. Do not run the impeller without water or lubricant; this can cause engine failure or a fire.

1. A vacuum is created as the flexible impeller vanes straighten upon leaving the cam, drawing liquid into the pump.

2. The rotating impeller carries liquid from the inlet to the outlet port.  As a consequence of their design, flexible impeller pumps can pass fairly large solids.

3. When the flexible impeller vanes regain contact with the cam, they bend and the liquid is discharged from the pump in a uniform flow.  Liquids can be pumped in the opposite direction by reversing the rotation of the pump.

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