Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084)

Water Pump Impeller – Fits Johnson/Evinrude 8-15 HP (Replaces 386084)

This water pump impeller is designed for Johnson/Evinrude 8 HP 4-Stroke (211cc) outboards from 1995–2004 and 9.9/15 HP 2-Stroke & 4-Stroke models from 1974–2006. It serves as a crucial component for maintaining proper engine cooling by circulating raw water through the system.

This part is a direct replacement for Johnson/Evinrude OEM part numbers 386084 / 0386084 and also interchanges with Sierra 18-3050 and OMC 386084, 500355, 4700587.

• Installs directly into the lower unit's water pump housing.
• Constructed from durable neoprene rubber with a brass hub for corrosion resistance.
• Engineered specifically for raw water cooling systems in outboard motors.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (386084)

Installation Guide

Professional installation is recommended. The following steps provide a general guide for replacing the water pump impeller:

1. Disconnect Power: Ensure the engine is off and disconnect the battery.
2. Drain Gearcase Oil: Place a drain pan under the lower unit and remove the drain/fill screws to empty the oil.
3. Remove Lower Unit: Unbolt the lower unit from the upper housing. You may need to disconnect a shift linkage.
4. Access Impeller: Locate the water pump housing on top of the lower unit and remove its bolts to open it.
5. Remove Old Impeller: Lift off the housing and pull the old impeller off the drive shaft. Note the rotational direction of the old impeller's vanes.
6. Clean & Prep: Thoroughly clean the inside of the pump housing and inspect it for wear or damage.
7. Install New Impeller: Lubricate the new impeller and housing interior with a small amount of grease. Slide the new impeller onto the drive shaft, twisting it in the direction of engine rotation to bend the vanes correctly.
8. Reassemble Pump: Reinstall the water pump housing and gasket, ensuring a tight seal. Torque bolts to manufacturer specifications.
9. Reattach Lower Unit: Guide the lower unit back into place, ensuring the drive shaft, water tube, and shift shaft align. Secure the bolts.
10. Refill Oil: Refill the gearcase with the correct type and amount of marine gear lube.
11. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?

A: Start by checking the "Compatible Engine Models" table on this page. Compare your engine's model, horsepower, and year range against the list. For Johnson/Evinrude engines, you can use the linked serial number guide to verify your model details for an exact match.

Q: How often should I replace my water pump impeller?

A: For optimal performance and engine safety, we recommend inspecting your impeller annually and replacing it every 1-2 years or every 100-200 hours of use. Replacement may be needed sooner if you frequently operate in saltwater, silt, or sandy conditions.

Q: What are the symptoms of a failing water pump impeller?

A: The most common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" cooling system outlet, and a melted water pump housing. Upon inspection, a worn impeller may have cracked, brittle, or permanently bent vanes.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.