Water Pump Impeller with Key for Evinrude/Johnson 4–8 HP Outboards – Replaces 389576, 433914, 433936, 436137, 777822 and 778225
Water Pump Impeller with Key for Evinrude/Johnson 4–8 HP Outboards – Replaces 389576, 433914, 433936, 436137, 777822 and 778225 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 with Key for Evinrude/Johnson 4–8 HP Outboards ...
Water Pump Impeller with Key for Evinrude/Johnson 4–8 HP Outboards – Replaces 389576, 433914, 433936, 436137, 777822 and 778225 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller with key is a replacement cooling-system component for specified Evinrude and Johnson outboards. It is listed for selected 4 HP, 4.5 HP, 5 HP, 6 HP and 8 HP models, including both 2-stroke and 4-stroke applications where noted below. The included key is intended to help transfer rotation from the driveshaft to the impeller.
The impeller is an aftermarket replacement associated with Evinrude, Johnson, OMC and BRP Marine reference numbers. Always match the complete engine application, stroke type and year range before ordering.
- Replacement water pump impeller supplied with one key.
- Designed for the listed Evinrude/Johnson outboard applications.
- Helps restore water-pump circulation when the original impeller is worn or damaged.
- Professional installation is recommended.
Part Number Matrix
Use the following reference numbers to compare this replacement with your original part and catalog information.
| Brand or Source | Reference Number |
|---|---|
| Evinrude / Johnson / OMC / BRP Marine | 389576 |
| Evinrude / Johnson / OMC / BRP Marine | 433914 |
| Evinrude / Johnson / OMC / BRP Marine | 433936 |
| Evinrude / Johnson / OMC / BRP Marine | 436137 |
| Evinrude / Johnson / OMC / BRP Marine | 777822 |
| Evinrude / Johnson / OMC / BRP Marine | 778225 |
| Key reference | 0300611 |
| Sierra Marine | 18-3091 |
| Mallory Marine | 9-45214 |
| GLM Marine | 89500 |
| CEF | 500358 |
Engine & Model Compatibility
Confirm the brand, horsepower, stroke type and year range of your engine before installation. Model-specific serial-number cutoffs may apply.
| Brand | Rated HP | Stroke | Years | Application Notes |
|---|---|---|---|---|
| Evinrude / Johnson | 4 | 2-Stroke | 1986–1992 | Listed 4 HP applications |
| Evinrude / Johnson | 4 | 2-Stroke | 1980–1997 | Deluxe models |
| Evinrude / Johnson | 4.5 | 2-Stroke | 1980–1997 | Listed 4.5 HP applications |
| Evinrude / Johnson | 5 | 2-Stroke | 1980–2001 | Listed 5 HP applications |
| Evinrude / Johnson | 5 | 4-Stroke | 1980 and newer | Listed 5 HP applications |
| Evinrude / Johnson | 6 | 2-Stroke | 1984–2005 | Listed 6 HP applications |
| Evinrude / Johnson | 6 | 4-Stroke | 1998 and newer | Listed 6 HP applications |
| Evinrude / Johnson | 8 | 2-Stroke | 1986–1997 | Listed 8 HP applications |
| Evinrude / Johnson | 8 | 4-Stroke | 1980–2005 | Listed 8 HP applications |
Technical Specifications
- Product Type
- Water pump impeller with key
- Application
- Selected Evinrude and Johnson outboard water-pump systems
- Stroke Applications
- 2-stroke and 4-stroke applications as listed in the compatibility table
- Included Key
- One key; reference 0300611
- Installation
- Direct replacement application; professional installation recommended
- Aftermarket References
- Sierra Marine 18-3091, Mallory Marine 9-45214, GLM Marine 89500 and CEF 500358
What’s in the Box
- 1 × aftermarket water pump impeller
- 1 × impeller key
Installation Notes
- Turn off the engine, allow it to cool and follow the applicable service manual safety procedures.
- Remove the gearcase or lower unit as required to access the water pump.
- Remove the water pump housing and take out the old impeller and key.
- Inspect the pump housing, wear plate, seals and related components for wear or damage.
- Clean the pump area and confirm that the replacement impeller and key match the original application.
- Install the key in the driveshaft and fit the impeller in the correct orientation.
- Reinstall the water pump housing and all applicable gaskets, seals and fasteners according to the service manual.
- Reattach the lower unit and test the engine while monitoring the cooling-water discharge.
Troubleshooting & FAQ
How do I confirm that this impeller fits my engine?
Compare your engine’s brand, horsepower, stroke type and year with the compatibility table. Also compare the original impeller, key and pump components with the listed reference numbers. If your model falls outside the listed range or has an unknown serial-number cutoff, consult the engine service manual or a qualified marine technician before ordering.
What are common signs of a worn water pump impeller?
Common signs can include a weak or missing cooling-water discharge, overheating, or visible deterioration such as cracked, brittle or missing impeller vanes. Do not continue operating an overheating engine.
Does this product include the key?
Yes. This product is supplied as one water pump impeller with one key. The key reference listed by the company is 0300611.
Is this an OEM part?
No. This is an aftermarket replacement. Evinrude, Johnson, OMC, BRP Marine, Sierra, Mallory, GLM and CEF names and reference numbers are provided only for application and cross-reference purposes.
Should a professional install the impeller?
Professional installation is recommended because access requires removal of the lower unit or water-pump components, and incorrect installation can affect engine cooling.
Safety & Important Information
- Verify the complete engine application before purchase, including horsepower, stroke type and year range.
- Do not operate an engine that is overheating or lacks a normal cooling-water discharge.
- Use the applicable manufacturer service procedure for disassembly, gasket replacement and reassembly.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for common marine service and maintenance applications.
- Application-Focused Listings — Product references and fitment information are presented to help match the part to your engine.
- Support for Maintenance Projects — Verify the application and service requirements before beginning installation.
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