Water Pump Impeller for Evinrude Johnson 1.2–6 HP – Replaces 387361, 763735, 777831
Water Pump Impeller for Evinrude Johnson 1.2–6 HP – Replaces 387361, 763735, 777831 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 Evinrude Johnson 1.2–6 HP – Replaces 387361...
Water Pump Impeller for Evinrude Johnson 1.2–6 HP – Replaces 387361, 763735, 777831 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed for specified Evinrude and Johnson outboard applications from 1.2 to 6 HP. It replaces the listed OMC/Evinrude/Johnson references and helps restore water-pump flow for reliable engine cooling.
The specified applications include 1.2 HP models from 1986–1990, 2 HP models from 1985–1990, 4 HP models from 1976–1980 with a 90-degree gearcase, and 6 HP models from 1979. Verify the engine model, year, gearcase configuration, and original impeller before ordering.
- Aftermarket rubber water pump impeller for selected Evinrude and Johnson outboards.
- Six-blade design for the specified cooling-system applications.
- Approximate 1.50-inch outside diameter and 0.440-inch inside diameter based on catalog identification data.
- Sold as one impeller; a drive key or pin is not listed as a separate included item for this product.
Part Number Matrix
Use the following references to compare the replacement impeller with your original part.
| Brand or source | Part number |
|---|---|
| OMC / Evinrude / Johnson | 387361 |
| OMC / Evinrude / Johnson | 763735 |
| OMC / Evinrude / Johnson | 777831 |
| GLM Marine | 89490 |
| Sierra Marine | 18-3090 |
| Mallory Marine | 9-45210 |
| SEI Marine | 96-399-02 |
Engine & Model Compatibility
Fitment is limited to the applications shown below. Keep the horsepower, year, stroke, and gearcase condition together when checking compatibility.
| Brand | Model or application | Rated HP | Stroke | Years | OEM reference | Notes |
|---|---|---|---|---|---|---|
| Evinrude / Johnson | 1.2 HP outboard | 1.2 HP | 2-Stroke | 1986–1990 | 387361, 763735, 777831 | Verify the exact engine model. |
| Evinrude / Johnson | 2 Jr, Colt and related applications | 2 HP | 2-Stroke | 1985–1990 | 387361, 763735, 777831 | Verify the exact engine model. |
| Evinrude / Johnson | 4 HP outboard | 4 HP | 2-Stroke | 1976–1980 | 387361, 763735, 777831 | 90-degree gearcase only. |
| Evinrude / Johnson | 6 HP outboard | 6 HP | 2-Stroke | 1979 | 387361, 763735, 777831 | Verify the exact engine model. |
Technical Specs
- Product Type
- Water pump impeller
- Product Configuration
- Single impeller, not a kit
- Material
- Rubber impeller
- Blade Count
- 6 blades
- Approximate Outside Diameter
- 1.50 inches
- Approximate Inside Diameter
- 0.440 inches
- Drive Arrangement
- Catalog identification lists a pin-style drive arrangement; confirm the shaft and original drive feature before installation.
- Installation
- Replacement water-pump impeller for the specified applications
What’s in the Box
- 1 × Water pump impeller
A separate key, pin, gasket, housing, wear plate, or other water-pump component is not included unless specifically shown in the order contents.
Installation Notes
- Stop the engine, disconnect the battery where applicable, and place the outboard in a stable working position.
- Remove the lower unit according to the engine service manual.
- Open the water-pump housing and remove the old impeller.
- Inspect the housing, wear plate, shaft, and drive pin or key for wear, corrosion, or damage.
- Clean debris from the water-pump area and confirm that the replacement impeller matches the original diameter and drive arrangement.
- Install the impeller in the correct orientation for the direction of shaft rotation. Replace any worn or damaged drive hardware before assembly.
- Reinstall the pump housing and lower unit using the manufacturer’s service procedure and torque specifications.
- Run the engine only with an appropriate water supply and confirm a normal cooling-water discharge before regular use.
Troubleshooting & FAQ
How do I know if the water-pump impeller is worn?
Common signs include a weak or intermittent tell-tale stream, overheating, or reduced cooling performance. Remove and inspect the impeller for cracked, hardened, missing, or permanently deformed blades.
Will this fit every 4 HP Evinrude or Johnson engine?
No. The listed 4 HP fitment is limited to 1976–1980 applications with a 90-degree gearcase. Confirm the gearcase configuration and original part number before purchase.
Is this a complete water-pump kit?
No. This listing is for one replacement impeller. The water-pump housing, wear plate, gasket, drive pin, key, and other components are not included unless separately stated.
Does the package include a drive key or pin?
No separate key or pin is listed in the company package information. Retain the original drive hardware for comparison and replace it separately if it is worn or damaged.
How often should an impeller be inspected?
Inspect the impeller during routine service and whenever cooling performance changes. Replacement timing depends on operating hours, storage conditions, water quality, and whether the engine has been run without adequate water supply.
What causes premature impeller failure?
Running the engine without sufficient water, debris, corrosion, long storage periods, and normal rubber aging can damage the impeller. Always supply cooling water during testing and inspect the pump components during replacement.
Is this an OEM component?
This is an aftermarket replacement impeller. It is listed for the specified applications and references, but it is not manufactured by Evinrude, Johnson, OMC, BRP, Sierra, Mallory, GLM, or SEI.
Safety & Important Information
- Confirm the engine model, year, horsepower, stroke, gearcase type, and original impeller before ordering.
- Do not run an outboard without an adequate cooling-water supply.
- Professional installation is recommended if you are unfamiliar with lower-unit or water-pump service.
- Stop operation immediately if the engine overheats or the cooling-water discharge is weak or absent.
About Sea Sierra
- Marine Replacement Parts — Parts selected for specified marine applications and replacement needs.
- Application-Focused Information — Verify model and configuration details before installation.
- Practical Service Support — Clear product information to help maintain dependable outboard cooling systems.
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