386084 Water Pump Impeller for Johnson Evinrude OMC BRP | JLM Marine

Water Pump Impeller 386084 – Fits Johnson Evinrude OMC BRP 8HP 9.9HP 10HP 15HP Outboard Motors

This high-performance replacement impeller is engineered for Johnson, Evinrude, OMC, and BRP outboard motors rated 8HP, 9.9HP, 10HP, and 15HP. Designed to make water pump repair and maintenance straightforward, this impeller ensures reliable cooling system operation for your outboard engine.

Direct Replacements: OEM# 386084, 0386084 | Sierra P/N 18-3050 | CEF P/N 500355

• Manufactured from high-performance neoprene rubber and corrosion-resistant metal alloy
• 6-blade design with precise 38.40 mm external diameter and 12.75 mm shaft insert diameter
• Engineered for top performance and durability in marine environments

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 Serial Number Guide.

Technical Specifications

Package Contents

• 1 × Outboard Impeller (Neoprene replacement for Johnson/Evinrude 386084 9.9/15 Horsepower)

Installation Guide

1. Disconnect the fuel line and remove the engine cowling to access the lower unit. Ensure the engine is turned off and cooled down completely.
2. Drain the lower unit gear oil by removing the drain and vent plugs. Disconnect the water pump hose if attached.
3. Remove the bolts securing the lower unit to the mid-section and carefully separate the lower unit from the engine.
4. Locate the water pump housing on top of the lower unit. Remove the retaining bolts and lift off the housing cover.
5. Carefully remove the old impeller from the pump housing, noting the direction of the blade curvature for proper installation.
6. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion.
7. Apply a thin coat of water-resistant marine grease to the new impeller blades and the inside of the pump housing.
8. Insert the new impeller into the housing, ensuring the blades curve in the correct rotational direction. Align the drive pin with the slot in the impeller.
9. Install a new gasket (if included or available) and carefully reassemble the pump housing cover, tightening bolts in a crisscross pattern to specification.
10. Reattach the lower unit to the mid-section, ensuring proper alignment of the driveshaft and water tube. Torque all mounting bolts to manufacturer specifications.
11. Refill the lower unit with the appropriate marine gear oil and reinstall drain/vent plugs.
12. Reconnect all hoses and lines, reinstall the cowling, and test the engine in water to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: Verify that your outboard is a Johnson, Evinrude, OMC, or BRP model rated 8HP, 9.9HP, 10HP, or 15HP. Cross-reference your original impeller OEM number (386084 or 0386084) or aftermarket equivalents (Sierra 18-3050, CEF 500355). Check that the physical dimensions match: 6 blades, 38.40 mm external diameter, and 12.75 mm shaft insert diameter.

Q: How often should I replace the water pump impeller?
A: Most manufacturers recommend inspecting the impeller annually and replacing it every 2–3 years or every 200–300 hours of operation, whichever comes first. If you notice overheating, reduced water flow from the tell-tale, or visible cracking/wear on the impeller blades, replace it immediately regardless of service interval.

Q: What are the signs of a failing impeller?
A: Common symptoms include engine overheating, weak or no water discharge from the tell-tale (cooling indicator), steam from the engine, or a high-temperature alarm. If you experience any of these, shut down the engine immediately and inspect the impeller and cooling system.

Q: Can I install this impeller myself, or do I need a professional?
A: Installation requires removing the lower unit and disassembling the water pump housing, which involves mechanical skills and proper tools. If you are comfortable with outboard maintenance and have a service manual, DIY installation is feasible. Otherwise, professional installation is recommended to ensure correct fitment and avoid damage.

Q: What's the difference between this aftermarket impeller and the OEM part?
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.