390286 Impeller for Evinrude Johnson OMC BRP | JLM Marine

390286 Impeller for Evinrude Johnson OMC BRP Outboard Motors

This precision-engineered impeller is designed to fit Evinrude Johnson OMC BRP 40HP outboard motors from 1983 to 1986. It ensures reliable water circulation through your engine's cooling system, protecting against overheating and maintaining optimal performance on the water.

This aftermarket replacement directly replaces OEM part number 390286 / 0390286 and aftermarket equivalent Sierra 18-3366, providing a cost-effective solution without compromising on quality or fit.

• Features a brass hub for enhanced durability and corrosion resistance
• Precision-molded with 6 blades for efficient water flow
• Direct replacement for original equipment—no modifications required

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 × Outboard Impeller

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor following your engine's service manual.
2. Remove the water pump housing by unscrewing the retaining bolts. Carefully separate the housing from the pump assembly.
3. Extract the old impeller from the housing, noting the direction of the blade rotation for proper installation.
4. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion that may affect the seal.
5. Inspect the drive shaft for wear or damage; replace the drive pin if necessary.
6. Lubricate the new impeller blades with water pump grease or liquid dish soap to ease installation and prevent tearing.
7. Install the new impeller onto the drive shaft, ensuring the blades curve in the correct direction of rotation.
8. Rotate the drive shaft by hand to confirm the impeller spins freely without binding.
9. Replace all gaskets and seals in the water pump assembly with new components to ensure a watertight seal.
10. Reassemble the water pump housing, torquing bolts to the manufacturer's specifications in a crisscross pattern.
11. Reinstall the lower unit onto the outboard motor, reconnect the fuel line, and check all fasteners.
12. Test the cooling system by running the engine in a test tank or on muffs, confirming a strong water stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson or Evinrude 40HP outboard?
A: Check the compatible engine models table above and match your engine's model number and year. The impeller fits all listed Johnson and Evinrude 40HP models from 1983 to 1986. You can also cross-reference your original OEM part number (390286 or 0390286) to confirm compatibility.

Q: How often should I replace my outboard impeller?
A: Most manufacturers recommend replacing the impeller annually or every 200–300 hours of operation, whichever comes first. If you notice reduced water flow from the tell-tale, overheating, or visible blade damage during inspection, replace the impeller immediately regardless of service interval.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include weak or no water discharge from the tell-tale outlet, engine overheating or temperature warning alarms, steam from the engine, and reduced performance. If you experience any of these issues, inspect and replace the impeller as soon as possible to prevent engine damage.

Q: What is the difference between this aftermarket impeller and the OEM version?
A: This aftermarket impeller is manufactured to OEM specifications with the same dimensions, blade count, and brass hub material. While it is not an OEM component, it is produced in an ISO9002-certified facility and provides comparable performance and durability at a more competitive price point.

Q: Can I install this impeller myself, or do I need a professional mechanic?
A: If you have basic mechanical skills and the right tools, you can install this impeller by following the installation guide and your engine's service manual. However, if you are unfamiliar with outboard lower unit disassembly or lack the necessary tools, we recommend professional installation to ensure proper fit and function.

Q: Is this an OEM or aftermarket 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.