Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084)
Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084)
Product Details
This replacement Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084) is designed for reliable performance in raw water cooling systems. It is engineered to fit a range of Johnson/Evinrude outboards, including 8 HP 4-Stroke (1995–2004) and 9.9/15 HP 2-Stroke & 4-Stroke models from 1974 to 2006.
This component serves as a direct replacement for multiple part numbers, including Johnson/Evinrude 386084/0386084, Sierra 18-3050, and OMC 386084, 500355, 4700587.
- Installs as a direct replacement in the outboard's lower unit.
- Constructed from durable neoprene rubber with a corrosion-resistant brass hub.
- Engineered specifically for marine raw water cooling applications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 386084 / 0386084 |
| Sierra | 18-3050 |
| OMC | 386084 |
| OMC | 500355 |
| OMC | 4700587 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller is compatible with a wide range of Johnson/Evinrude outboard engines. Please verify your specific model and year to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 8 | 4-Stroke (211cc) | 1995–2004 | 386084 | |
| Johnson/Evinrude | Outboard | 9.9 | 2-Stroke | 1974–2006 | 386084 | |
| Johnson/Evinrude | Outboard | 9.9 | 4-Stroke (305cc) | 1995–2001 | 386084 | |
| Johnson/Evinrude | Outboard | 15 | 2-Stroke | 1974–2006 | 386084 | |
| Johnson/Evinrude | Outboard | 15 | 4-Stroke (305cc) | 1995–2001 | 386084 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement for lower unit
- Material
- Neoprene rubber with brass hub
- Connection
- Center hub mounted to drive shaft
- Other Technical Attributes
- Designed for raw water cooling systems
What’s in the Box
- 1 x Water Pump Impeller (386084)
Installation Notes
- Disconnect the battery and shift the outboard into the neutral position.
- Place a drain pan under the lower unit and remove the drain/fill screws to empty the gearcase oil.
- Unbolt and remove the lower unit from the engine's driveshaft housing.
- Remove the bolts securing the water pump housing to access the impeller.
- Slide the old impeller off the drive shaft, noting the keyway's position.
- Clean any debris from the pump housing and inspect the wear plate and housing for damage.
- Lightly lubricate the new impeller and the interior of the housing with a marine-safe grease.
- Install the new impeller, making sure the key aligns and the vanes are oriented correctly for engine rotation.
- Reinstall the water pump housing with new gaskets and seals as needed.
- Carefully guide the lower unit back into place, aligning the drive shaft, shift shaft, and water tube.
- Secure the lower unit with its mounting bolts and torque to the manufacturer's specifications.
- Refill the gearcase with fresh oil and test run the engine to verify water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller will fit my engine?
Please check the "Engine & Model Compatibility" table on this page. Match your engine's brand, model, horsepower, and year range to confirm fitment. Cross-reference your existing part number with those in the "Part Number Matrix."
What are common signs of a failing water pump impeller?
The most common signs are engine overheating at idle or low speeds, and a weak or non-existent water stream from the "tell-tale" outlet. Reduced engine performance can also be an indicator.
How often should an impeller be replaced?
As a preventative maintenance item, most manufacturers recommend replacing the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Usage in saltwater or sandy/silty conditions may require more frequent replacement.
Is any special grease required for installation?
Yes, it is highly recommended to use a light coat of marine-grade, water-insoluble grease or a silicone-based lubricant on the impeller vanes and inside the pump housing to aid installation and provide lubrication during the initial dry start.
What is the correct orientation of the impeller vanes during installation?
The impeller vanes should be bent in the opposite direction of the driveshaft's normal operating rotation. When you slide the housing down over the impeller, twist the driveshaft in its clockwise rotational direction to correctly fold the vanes.
Is this part OEM or aftermarket?
This listing is for a high-quality aftermarket replacement part, not an OEM component. It has been engineered to meet or exceed OEM specifications using comparable materials and is manufactured in an ISO 9002 certified facility with rigorous batch inspections.
What are the shipping speed and cost?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended for safety, proper function, and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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