Water Pump Impeller with Key for Johnson/Evinrude 40HP 2-Stroke (Replaces 390286, 0390286, 777835, 0777835)
Water Pump Impeller with Key for Johnson/Evinrude 40HP 2-Stroke (Replaces 390286, 0390286, 777835, 0777835) 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 Johnson/Evinrude 40HP 2-Stroke (Re...
Water Pump Impeller with Key for Johnson/Evinrude 40HP 2-Stroke (Replaces 390286, 0390286, 777835, 0777835) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller with key is designed as a replacement for selected Evinrude and Johnson 40 HP 2-stroke outboards. It helps restore water-pump operation and maintain proper engine cooling when the original impeller is worn, cracked, brittle, or damaged.
The impeller is listed for Evinrude/Johnson OEM references 390286, 0390286, 777835, and 0777835. Cataloged aftermarket cross-references include Sierra Marine 18-3366, CEF 500353, Mallory Marine 9-45212, GLM 89990, and SEI Marine 96-399-05E.
- Aftermarket water pump impeller replacement.
- Includes one impeller and one impeller key.
- Designed for the listed Johnson and Evinrude 40 HP 2-stroke applications.
- Confirm the complete engine model and year before ordering.
Part Number Matrix
Use these manufacturer and aftermarket references to compare your original part. Cross-reference numbers should be confirmed against the complete engine model and year.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 390286 / 0390286 |
| Johnson/Evinrude | 777835 / 0777835 |
| Sierra Marine | 18-3366 |
| CEF | 500353 |
| Mallory Marine | 9-45212 |
| GLM | 89990 |
| SEI Marine | 96-399-05E |
Engine & Model Compatibility
The confirmed detailed application information supplied for this listing covers Johnson and Evinrude 40 HP 2-stroke outboards from 1983 through 1986. Match the exact model designation before installation.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Evinrude | E40RSLR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Evinrude | E40RSR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Evinrude | E40RWCDB | 40 | 2-Stroke | 1986 | 390286 / 0390286 |
| Evinrude | E40RWCOM | 40 | 2-Stroke | 1985 | 390286 / 0390286 |
| Evinrude | E40RWCRA | 40 | 2-Stroke | 1984 | 390286 / 0390286 |
| Evinrude | E40RWLCDB | 40 | 2-Stroke | 1986 | 390286 / 0390286 |
| Evinrude | E40RWLCOM | 40 | 2-Stroke | 1985 | 390286 / 0390286 |
| Evinrude | E40RWLCRA | 40 | 2-Stroke | 1984 | 390286 / 0390286 |
| Evinrude | E40RWLCTR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Evinrude | E40RWLTR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Johnson | J40RSLR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Johnson | J40RSR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Johnson | J40RWCDB | 40 | 2-Stroke | 1986 | 390286 / 0390286 |
| Johnson | J40RWCOM | 40 | 2-Stroke | 1985 | 390286 / 0390286 |
| Johnson | J40RWCRA | 40 | 2-Stroke | 1984 | 390286 / 0390286 |
| Johnson | J40RWCTR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
| Johnson | J40RWLCDB | 40 | 2-Stroke | 1986 | 390286 / 0390286 |
| Johnson | J40RWLCOM | 40 | 2-Stroke | 1985 | 390286 / 0390286 |
| Johnson | J40RWLCRA | 40 | 2-Stroke | 1984 | 390286 / 0390286 |
| Johnson | J40RWLCTR | 40 | 2-Stroke | 1983 | 390286 / 0390286 |
Technical Specs
- Product Type
- Water pump impeller with key
- Application
- Selected Evinrude and Johnson 40 HP 2-stroke outboards
- Installation
- Direct replacement for the listed applications
- Outside Diameter
- Approximately 2.00 inches
- Inside Diameter
- Approximately 0.690 inch
- Key
- Included
- OEM Reference
- 390286 / 0390286
What’s in the Box
- 1 x Aftermarket water pump impeller
- 1 x Impeller key
Installation Notes
- Disconnect the battery and remove the engine cover.
- Shift the outboard into neutral.
- Remove the lower unit according to the engine service procedure.
- Remove the water pump housing cover.
- Remove the old impeller and note the direction of its blades.
- Clean the housing and inspect it for wear, cracks, corrosion, or damage.
- Install the supplied key and fit the new impeller onto the shaft, turning the impeller in the correct direction as it enters the housing.
- Reassemble the water pump housing and lower unit using the manufacturer’s torque and sealing procedures.
- Run the engine in water or with the correct flushing equipment and verify water flow from the telltale outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
Compare your complete engine model, horsepower, stroke, and year with the compatibility table. This listing is specifically described for the listed Johnson and Evinrude 40 HP 2-stroke models from 1983 through 1986. Do not rely on horsepower alone.
Does this listing include the key?
Yes. This product is supplied as an impeller with one impeller key.
What are the signs of a failing water pump impeller?
Common signs include weak or absent water flow from the telltale outlet, overheating warnings, rising operating temperature, or cracked, brittle, and broken blades on the removed impeller.
How often should the impeller be replaced?
Inspect the impeller during routine service and replace it when the blades show wear, cracking, hardening, distortion, or damage. Replacement intervals depend on operating hours, storage conditions, and whether the engine is used in saltwater or freshwater.
Is this a genuine OEM part?
No. This is an aftermarket replacement impeller and key, not a genuine original-equipment assembly.
What should I check before ordering?
Verify the exact engine model and year, the original impeller dimensions, the OEM reference number, and the key arrangement. If any of these details differ, confirm compatibility before purchase.
Safety & Important Information
- Always compare the original part and complete engine model before ordering.
- Use the correct service manual procedures when removing the lower unit and water pump housing.
- Never operate the outboard without an adequate water supply or approved flushing equipment.
- Professional installation is recommended if you are not familiar with outboard lower-unit service.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine maintenance and repair.
- Application-Focused Listings — Product information is organized around engine models, years, and reference numbers.
- Value-Oriented Service — Replacement parts selected for common marine maintenance needs.
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