Water Pump Impeller for Johnson/Evinrude 3–7.5 HP 2-Stroke Outboards – Replaces 277181 and 434424
Water Pump Impeller for Johnson/Evinrude 3–7.5 HP 2-Stroke Outboards – Replaces 277181 and 434424 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 for Johnson/Evinrude 3–7.5 HP 2-Stroke Outboard...
Water Pump Impeller for Johnson/Evinrude 3–7.5 HP 2-Stroke Outboards – Replaces 277181 and 434424 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller is intended for selected Johnson/Evinrude 2-stroke outboard engines from 3 HP through 7.5 HP. The listed applications include Johnson/Evinrude 3 HP models from 1952–1978, 4 HP models from 1969–1983, 5 HP models from 1965–1968, 5.5 HP models from 1954–1964, 6 HP models from 1972–1978, and 7.5 HP models from 1954–1958.
For 4 HP engines from 1973–1983, the listed application is for water pumps using one water tube and a 110 gearcase. Confirm the exact engine model, year, gearcase configuration, and existing impeller dimensions before ordering.
- Aftermarket replacement water pump impeller for marine cooling systems.
- Made from neoprene rubber for use in an outboard water pump.
- Single impeller supplied; installation should follow the applicable engine service manual.
Part Number Matrix
Use these manufacturer and aftermarket references to compare your existing part with this replacement impeller.
| Brand | Part Number |
|---|---|
| Sierra Marine | 18-3001 |
| Mallory Marine | 9-45216 |
| GLM | 89580 |
| SEI Marine | 96-399-01ECEF / 500350 |
| Johnson/Evinrude | 277181 / 0277181 / 434424 / 0434424 / 777819 / 0777819 |
Engine & Model Compatibility
The applications below are grouped by horsepower, stroke, and year. Model names can vary by market and serial-number range, so compare all listed conditions with your engine and existing part.
| Brand | Model | Rated HP | Stroke | Years | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 3 | 2-Stroke | 1952–1978 | 277181 / 434424 | Confirm the exact model and gearcase. |
| Johnson/Evinrude | Various | 4 | 2-Stroke | 1969–1972 | 277181 / 434424 | Confirm the exact model and gearcase. |
| Johnson/Evinrude | Various | 4 | 2-Stroke | 1973–1983 | 277181 / 434424 | For water pumps using one water tube and a 110 gearcase. |
| Johnson/Evinrude | Various | 5 | 2-Stroke | 1965–1968 | 277181 / 434424 | Confirm the exact model and gearcase. |
| Johnson/Evinrude | Various | 5.5 | 2-Stroke | 1954–1964 | 277181 / 434424 | Confirm the exact model and gearcase. |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1972–1978 | 277181 / 434424 | Confirm the exact model and gearcase. |
| Johnson/Evinrude | Various | 7.5 | 2-Stroke | 1954–1958 | 277181 / 434424 | Confirm the exact model and gearcase. |
Technical Specs
- Product Type
- Water Pump Impeller
- Application
- Selected Johnson/Evinrude 2-stroke outboards, 3–7.5 HP
- Material
- Neoprene rubber
- Outside Diameter
- Approximately 2.50 in
- Inside Diameter
- Approximately 0.425 in
- Part Configuration
- Single impeller
What’s in the Box
- 1 x Water Pump Impeller
The drive key, gaskets, housing, and other water-pump components are not listed as included. Reuse or replace these components only as specified by the applicable service manual.
Installation Notes
- Turn off the engine and follow the safety and removal procedures in the applicable service manual.
- Remove the lower unit or gearcase as required to access the water pump.
- Remove the water pump housing cover and note the installed direction of the old impeller blades.
- Remove the old impeller and inspect the drive key, housing, plate, seals, and mating surfaces for wear or damage.
- Clean the mating surfaces and install the replacement impeller using the correct drive key and any required gaskets or seals. The drive key is not included with this single impeller.
- Install the impeller in the correct rotational direction and refit the water pump housing.
- Reinstall the lower unit, ensuring that the water tube and driveshaft are correctly aligned.
- Test the cooling-water discharge according to the service manual before returning the engine to normal operation.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
Compare the engine brand, horsepower, 2-stroke configuration, model year, gearcase arrangement, existing part number, and impeller dimensions with the information on this page. For 4 HP engines from 1973–1983, confirm that the water pump uses one water tube and a 110 gearcase. If any condition differs, consult the engine service manual before ordering.
What part numbers does this impeller replace?
The listed Johnson/Evinrude reference numbers are 277181, 0277181, 434424, 0434424, 777819, and 0777819. Listed aftermarket references include Sierra Marine 18-3001, Mallory Marine 9-45216, GLM 89580, and SEI Marine 96-399-01ECEF / 500350.
What are the signs of a failing water pump impeller?
Common signs include a weak or missing telltale stream, overheating, an overheating alarm, or steam from the exhaust. Stop operation and investigate the cooling system if these symptoms occur.
Does the impeller include a drive key or gasket?
No. This listing is for one impeller only. A drive key, gasket, seal, or other water-pump component is not listed as included and should be sourced or replaced according to the applicable service manual.
Is this an OEM part or aftermarket?
This is an aftermarket replacement impeller, not an OEM component. The manufacturer references shown above are provided for identification and cross-reference purposes.
Safety & Important Info
- Verify the engine model, horsepower, year, stroke, gearcase configuration, reference number, and dimensions before purchase.
- Do not operate an outboard with inadequate cooling-water flow.
- Use the applicable engine service manual for installation procedures, torque specifications, and replacement intervals.
- Professional installation is recommended if you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for outboard and marine applications.
- Application-Focused Listings — Product references and fitment conditions are provided to help you compare the replacement with your original part.
- Customer Support — Contact support with your engine model, year, existing part number, and application details if you need help confirming compatibility.
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