Water Pump Impeller Kit for Johnson/Evinrude 4–8 HP Outboards – Replaces 389576, 433914, 436137 and 777822
Water Pump Impeller Kit for Johnson/Evinrude 4–8 HP Outboards – Replaces 389576, 433914, 436137 and 777822 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 for Johnson/Evinrude 4–8 HP Outboards – Rep...
Water Pump Impeller Kit for Johnson/Evinrude 4–8 HP Outboards – Replaces 389576, 433914, 436137 and 777822 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Water Pump Impeller Kit for Johnson/Evinrude 4–8 HP Outboards is designed for use with a range of Johnson/Evinrude 4–8 HP 2-stroke outboards from 1980–2005, along with select 5–8 HP 4-stroke applications from 1980 onward. It helps restore water-pump performance and maintain proper engine cooling.
The impeller provides a replacement option for OEM references 389576, 433914, 436137, 777822 and 778225, as well as selected aftermarket references from Sierra, Mallory, GLM Marine and CEF. Confirm your exact engine model, year and original part number before ordering.
- Replacement water-pump impeller kit for selected Johnson/Evinrude outboards.
- Neoprene rubber impeller with a brass center hub for marine service.
- Kit includes the impeller, impeller key and gasket/seal for a complete water-pump service.
- Professional installation is recommended.
Part Number Matrix
Use the following references to compare the replacement with your original component. Cross-reference numbers are provided for identification; verify fitment against your specific engine.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 389576 |
| Johnson/Evinrude | 433914 |
| Johnson/Evinrude | 436137 |
| Johnson/Evinrude | 777822 |
| Johnson/Evinrude | 778225 |
| Sierra | 18-3091 |
| Mallory | 9-45214 |
| GLM Marine | 89500 |
| CEF | 500354 |
| CEF | 500358 |
Engine & Model Compatibility
Compatibility depends on the exact model, year and engine configuration. Match your original impeller and part number before installation.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 4 | 2-Stroke | 1986–1992 | 389576 / 433914 |
| Johnson/Evinrude | Outboard Deluxe | 4 | 2-Stroke | 1980–1997 | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 4.5 | 2-Stroke | 1980–1997 | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 5 | 2-Stroke | 1980–2001 | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 5 | 4-Stroke | 1998 and up | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 6 | 2-Stroke | 1984–2005 | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 6 | 4-Stroke | 1998 and up | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 8 | 2-Stroke | 1986–1997 | 389576 / 433914 |
| Johnson/Evinrude | Outboard | 8 | 4-Stroke | 1980–2005 | 389576 / 433914 |
Technical Specs
- Product Type
- Water pump impeller kit
- Impeller Material
- Neoprene rubber
- Center Hub
- Brass
- Number of Blades
- 6
- Overall Diameter
- 38.4 mm (1.51 in)
- Height
- 17.9 mm (0.70 in)
- Shaft Size
- 11.2 mm (0.44 in)
- Listed Weight
- 34 g (1.05 oz)
What’s in the Box
- 1 × Water pump impeller
- 1 × Impeller key
- 1 × Gasket/seal
Installation Notes
- Disconnect the battery and make sure the engine is switched off and cool.
- Remove the lower unit or gearcase according to the engine manufacturer’s service procedure.
- Remove the water-pump housing cover to access the impeller.
- Note the existing blade orientation, then remove the old impeller from the driveshaft.
- Remove the old key and gasket. Clean the housing and mating surfaces, removing debris and corrosion.
- Install the replacement gasket and key in their correct positions.
- Slide the new impeller onto the driveshaft and rotate it in the normal direction of engine operation so the blades are correctly oriented.
- Reinstall the water-pump housing and tighten the fasteners to the manufacturer’s specifications.
- Reattach the lower unit and secure all connections. Test the engine with an appropriate water supply to confirm proper cooling-water flow.
Troubleshooting & FAQ
How do I confirm that this impeller fits my exact engine?
Match your original impeller and OEM part number with the references in the Part Number Matrix, then compare the engine model, horsepower, stroke and year with the compatibility table. If the information does not match exactly, consult the engine service manual or confirm the model and serial number with a qualified marine-parts specialist.
What are the signs of a failing water-pump impeller?
Common symptoms include weak or missing water flow from the tell-tale outlet, an overheating alarm, elevated operating temperature or reduced performance. A worn impeller may also have cracked, hardened, deformed or missing blades.
How often should the impeller be replaced?
Inspect the impeller during regular maintenance and replace it according to the engine manufacturer’s service schedule. Replacement intervals depend on operating hours, storage conditions and whether the engine is used in saltwater, freshwater or sandy water.
Are the key and gasket included?
Yes. This listing is for a kit containing one water-pump impeller, one impeller key and one gasket/seal.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to replace the listed OEM and aftermarket references. It is not manufactured by Johnson or Evinrude.
What should I do if my original part looks different?
Do not install the part if the dimensions, hub, keyway or blade configuration differ from your original component. Confirm the complete engine model and original part number before purchase or installation.
Safety & Important Information
- Verify the engine model, year, horsepower, stroke and original part number before ordering.
- Compare the replacement’s dimensions and configuration with the original part before installation.
- Always follow the engine manufacturer’s service procedures and torque specifications.
- Never operate the outboard without an adequate water supply.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable real-world service.
- Fast Global Fulfillment — Standard delivery options are available to most regions.
- Manufacturer-Direct Value — Competitive pricing with attention to materials and quality control.
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