Water Pump Impeller Kit with Wedge Key – Johnson/Evinrude 40–75 HP 2-Stroke Large Gearcase
Water Pump Impeller Kit with Wedge Key – Johnson/Evinrude 40–75 HP 2-Stroke Large Gearcase is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller Kit with Wedge Key – Johnson/Evinrude 40–75 HP ...
Water Pump Impeller Kit with Wedge Key – Johnson/Evinrude 40–75 HP 2-Stroke Large Gearcase is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller kit with wedge key is intended for selected Johnson and Evinrude 2-stroke outboard applications using a large gearcase and the corresponding six-vane impeller design. It is associated with 40–75 HP applications listed below, including selected loopcharged models. Always confirm the original impeller, gearcase configuration, and engine model before ordering.
The impeller replaces Johnson/Evinrude OEM reference 396725 and is cross-referenced in aftermarket catalogs as Sierra 18-3053-1 and GLM 89710. The Sierra catalog identifies the application as an impeller that replaces 396725 and uses a wedge key.
- Marine-grade CR neoprene rubber impeller for routine cooling-system service.
- Six-vane design for compatible large-gearcase water pumps.
- Includes the matching plastic wedge-style driveshaft key.
- Aftermarket replacement component; not manufactured by Johnson, Evinrude, OMC, BRP, Sierra, or GLM.
Part Number Matrix
Use these references to compare the replacement impeller with your original part. Part-number cross-references do not replace confirmation of the complete engine and gearcase configuration.
| Brand or Source | Part Number | Reference |
|---|---|---|
| Johnson/Evinrude | 396725 | OEM replacement reference |
| Johnson/Evinrude | 0396725 | Formatted OEM reference |
| Sierra | 18-3053-1 | Aftermarket cross-reference for 396725 |
| GLM | 89710 | Aftermarket cross-reference for 396725 |
Engine & Model Compatibility
The following application ranges are provided as model-family guidance for compatible Johnson/Evinrude large-gearcase configurations. Year, serial number, gearcase size, and water-pump design can affect fitment. Verify the original part number and impeller dimensions before installation.
| Brand | Rated HP | Stroke | Years | OEM Part No. | Application Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | 40 HP | 2-Stroke | 1999 and later | 396725 | Large gearcase; verify six-vane impeller design |
| Johnson/Evinrude | 45 HP | 2-Stroke | 1995–2005 | 396725 | Large gearcase; verify six-vane impeller design |
| Johnson/Evinrude | 50 HP | 2-Stroke | 1986 and later | 396725 | Selected 2-cylinder loopcharged applications |
| Johnson/Evinrude | 55 HP | 2-Stroke | 1995–2005 | 396725 | Large gearcase; verify six-vane impeller design |
| Johnson/Evinrude | 60 HP | 2-Stroke | 1986 and later | 396725 | Selected 2-cylinder loopcharged applications |
| Johnson/Evinrude Commercial | 65 HP | 2-Stroke | 1984 and later | 396725 | Selected 3-cylinder loopcharged applications; verify wedge key |
| Johnson/Evinrude | 70 HP | 2-Stroke | 1979–2001 | 396725 | Selected 3-cylinder loopcharged applications; verify wedge key |
| Johnson/Evinrude | 75 HP | 2-Stroke | 1979–1988 | 396725 | Selected 3-cylinder loopcharged applications; verify wedge key |
Technical Specs
- Product Type
- Water pump impeller kit
- Impeller Material
- Marine-grade CR neoprene rubber
- Included Components
- One rubber impeller and one plastic wedge-style driveshaft key
- Key Type
- Plastic wedge key
- Impeller Design
- Six-vane
- Application
- Selected Johnson/Evinrude 2-stroke outboards with compatible large gearcase water pumps
- OEM Reference
- 396725
- Aftermarket References
- Sierra 18-3053-1 and GLM 89710
What’s in the Box
- 1 x Rubber water pump impeller
- 1 x Plastic wedge-style driveshaft key
Gaskets, O-rings, seals, screws, and water-pump housing components are not listed as included with this kit.
Installation Notes
- Safety First: Place the engine in a secure position, disconnect the battery, and prevent accidental starting before beginning service.
- Prepare the Lower Unit: Follow the engine service manual for lower-unit removal. Drain and refill gearcase lubricant only as specified by the manufacturer.
- Access the Water Pump: Remove the water-pump housing and retain the original hardware for reuse unless replacement hardware is specified by the service manual.
- Remove the Old Impeller: Remove the old impeller and driveshaft key. Clean the shaft, keyway, housing, and gasket surfaces before assembly.
- Install the New Components: Seat the plastic wedge key correctly in the driveshaft keyway, install the impeller in the correct rotational orientation, and lubricate with a water-pump-compatible lubricant.
- Reassemble: Reinstall the housing and lower unit using the manufacturer’s torque sequence and specifications. Replace any gaskets or seals that are not reusable; they are not included in this kit.
- Test: Run the engine only in an appropriate test tank or on the water, confirm steady tell-tale flow, and monitor for overheating.
Troubleshooting & FAQ
How do I confirm whether this kit fits my motor?
Match your original impeller reference to 396725 and confirm that your engine uses the compatible large gearcase, six-vane impeller, and plastic wedge-style driveshaft key. Also compare the original impeller and water-pump housing before installation.
What are the signs of a failing water-pump impeller?
Common signs include weak or intermittent tell-tale flow, overheating warnings, steam from the exhaust, or overheating-related damage. Shut down the engine and inspect the cooling system if any of these symptoms appear.
How often should a water-pump impeller be replaced?
Inspect the impeller according to the engine manufacturer’s maintenance schedule. Replacement intervals depend on operating hours, storage conditions, water quality, and exposure to sand, silt, or shallow water.
What does “large gearcase” mean?
Gearcase size and water-pump design vary within the same horsepower family. The most reliable confirmation is the engine model or serial number, the service manual, and comparison with the existing impeller and housing. Do not rely on horsepower alone.
Is this an OEM part?
No. This is an aftermarket replacement kit that references OEM number 396725 for identification and compatibility purposes.
Does the kit include seals and gaskets?
No. The package contains one impeller and one plastic wedge-style driveshaft key. Inspect and replace any required gaskets or seals separately.
What are the shipping and warranty terms?
Shipping availability, delivery estimates, warranty coverage, and return requirements are determined by the current store policies shown at checkout and on the applicable policy pages.
Safety & Important Information
- Confirm the complete engine model, year, serial range, gearcase, impeller design, and original part number before purchase.
- Do not operate an outboard with inadequate cooling-water flow or signs of overheating.
- Use the engine manufacturer’s service manual for disassembly, torque values, lubrication, and lower-unit procedures.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are not familiar with marine lower-unit service.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine marine maintenance and repair.
- Application-Focused Information — Product references and compatibility guidance are provided to help customers compare their original parts.
- Support for Fitment Checks — When fitment is uncertain, provide the engine model and serial information before ordering.
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