Water Pump Impeller with Drive Key – Johnson/Evinrude Outboards, Replaces OEM 396809
Water Pump Impeller with Drive Key – Johnson/Evinrude Outboards, Replaces OEM 396809 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller with Drive Key – Johnson/Evinrude Outboards, Re...
Water Pump Impeller with Drive Key – Johnson/Evinrude Outboards, Replaces OEM 396809 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller with drive key is an aftermarket replacement for Johnson/Evinrude outboard applications using OEM part number 396809. The impeller installs in the lower-unit water pump and helps restore the cooling system’s ability to circulate water through the engine.
This listing is for a replacement impeller and its compatible drive key. It is not a complete water pump rebuild kit and does not include the water pump housing, wear plate, seals, gaskets, or additional keys.
- Replacement water pump impeller for selected Johnson/Evinrude outboard applications.
- Designed for lower-unit water pump service.
- Impeller dimensions are approximately 2.750 inches outside diameter and 0.625 inch inside diameter.
- Includes one drive key for securing the impeller to the driveshaft.
- Verify the OEM number, dimensions, keyway, and water-pump configuration before ordering.
Part Number Matrix
The following references identify the impeller application. Cross-reference numbers should be used together with the original part, dimensions, and engine service information.
| Brand | Part Number | Reference Type |
|---|---|---|
| Johnson/Evinrude / OMC | 396809 | OEM reference |
| Sierra Marine | 18-3368 | Aftermarket interchange reference |
| GLM | 89780 | Aftermarket interchange reference |
Engine & Model Compatibility
This impeller is intended for Johnson/Evinrude outboard water-pump applications that specify OEM reference 396809. Available catalog evidence confirms the part-number relationship but does not establish one complete model-and-year coverage list for this replacement.
Do not determine fitment from horsepower or year alone. Before purchase, compare your original impeller with the listed dimensions, verify the driveshaft key arrangement, and confirm that your engine service information specifies OEM part number 396809 or an applicable interchange reference.
| Check | Required Match |
|---|---|
| Engine brand | Johnson or Evinrude outboard application |
| OEM reference | 396809, as specified by the engine or water-pump service information |
| Impeller outside diameter | Approximately 2.750 inches |
| Impeller inside diameter | Approximately 0.625 inch |
| Drive arrangement | Driveshaft key-mounted impeller using the included drive key |
Technical Specs
- Product Type
- Water Pump Impeller with Drive Key
- Application
- Selected Johnson/Evinrude outboard lower-unit water pumps
- Installation Location
- Lower unit / gearcase water pump
- Outside Diameter
- Approximately 2.750 inches (69.85 mm)
- Inside Diameter
- Approximately 0.625 inch (15.88 mm)
- Drive Style
- Key-mounted to the driveshaft
- Material
- Flexible marine water-pump impeller material
What’s in the Box
- 1 x Water pump impeller
- 1 x Impeller drive key
Not included: water pump housing, wear plate, base plate, seals, O-rings, gaskets, bolts, or additional drive keys.
Installation Notes
- Disconnect the battery and place the outboard in neutral. Follow the manufacturer’s service-manual safety procedures.
- Remove the lower unit and place it securely on a suitable work surface.
- Remove the water-pump housing and inspect the housing, wear plate, base, seals, and water tube for wear or damage.
- Remove the old impeller and drive key. Clean the mating surfaces and remove debris without damaging the pump components.
- Install the supplied drive key in the driveshaft keyway and slide the new impeller into position.
- Fit the water-pump housing over the impeller while rotating the driveshaft in the manufacturer-specified direction so the vanes bend correctly.
- Reassemble the water-pump components using any required gaskets or seals specified for your engine. Those service parts are not included with this impeller.
- Reinstall the lower unit, ensuring that the driveshaft, shift shaft, and water tube are correctly aligned.
- Test the outboard with an appropriate water supply and confirm a strong tell-tale stream before normal operation.
Installation should be performed by a qualified marine technician when the correct impeller orientation, torque values, or lower-unit procedures are uncertain.
Troubleshooting & FAQ
How do I confirm that this impeller will fit my motor?
Confirm that your service information or original impeller specifies OEM reference 396809. Also compare the approximately 2.750-inch outside diameter, 0.625-inch inside diameter, and keyed driveshaft arrangement. Horsepower and model year alone are not sufficient to confirm fitment.
What are the signs of a failing water-pump impeller?
Common signs include a weak or absent tell-tale stream, overheating, an overheating warning, steam, or visible damage to the impeller. An impeller that is cracked, brittle, melted, or missing vanes should be replaced before operating the engine.
Does this include a complete water-pump rebuild kit?
No. This listing includes one replacement impeller and one drive key only. The housing, wear plate, gaskets, O-rings, seals, bolts, and other water-pump service parts must be purchased separately if required.
Does the impeller include a drive key?
Yes. One compatible drive key is included. Inspect the original keyway and compare the supplied key before installation. Do not use a loose or damaged key.
Should I replace the housing or wear plate at the same time?
Inspect those parts whenever the water pump is serviced. Replace any component that is scored, warped, melted, excessively worn, or otherwise outside the manufacturer’s service limits. Those parts are not included here.
How often should an outboard impeller be replaced?
Replacement intervals vary with the engine manufacturer’s schedule and operating conditions. Saltwater, sand, silt, long storage periods, and overheating can shorten impeller life. Follow the engine service manual and replace the impeller whenever inspection shows deterioration.
Is this an OEM part?
No. This is an aftermarket replacement intended for applications that use the listed OEM reference. Johnson, Evinrude, OMC, Sierra, and GLM references are used for identification and interchange purposes only.
What should I do if my model is not listed?
Do not assume compatibility from horsepower or year. Verify the original part number, dimensions, key arrangement, and water-pump design against the engine service information before ordering.
Safety & Important Information
- Verify the OEM reference, dimensions, and drive-key arrangement before purchase.
- Do not operate an outboard without a reliable cooling-water supply.
- Use the manufacturer’s service manual for torque values, impeller orientation, and lower-unit procedures.
- Inspect all related water-pump components during installation.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Product references and dimensions are provided to help you compare the replacement with your original part.
- Support for Installation — Always use the engine manufacturer’s service information when completing water-pump work.
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