389576 Water Pump Impeller with Key for Evinrude Johnson OMC BRP | JLM Marine

Water Pump Impeller with Key for Evinrude Johnson OMC BRP Outboard Motors 4HP–8HP

This high-quality aftermarket water pump impeller is designed to fit Evinrude Johnson OMC BRP outboard motors ranging from 4HP to 8HP. It ensures reliable cooling system performance across both 2-stroke and 4-stroke models manufactured between 1980 and 1998+. Whether you're maintaining a vintage 4HP Deluxe or a newer 6HP 4-stroke, this impeller delivers dependable water flow to protect your engine from overheating.

Direct replacement for OEM part number 389576 / 0389576, this impeller also cross-references with leading aftermarket brands including Sierra 18-3091, CEF 500358, and Mallory 9-45214, providing you with a cost-effective solution without compromising on quality.

• Complete kit: Includes impeller with key/pin for immediate installation
• 6-blade design optimized for efficient water pumping in small-displacement outboards
• Precision-molded rubber construction for durability and proper sealing

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 Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor according to your engine's service manual.
2. Remove the water pump housing by unscrewing the retaining bolts. Take note of the gasket condition and replace if worn.
3. Extract the old impeller carefully using needle-nose pliers or a dedicated impeller puller tool. Inspect the pump housing for scoring or damage.
4. Clean the pump chamber thoroughly, removing any debris, old gasket material, or corrosion.
5. Lubricate the new impeller blades with water pump grease or dish soap to ease installation and protect the rubber during initial startup.
6. Insert the drive key/pin into the impeller shaft slot, ensuring it is fully seated and properly aligned.
7. Install the new impeller by gently rotating it clockwise (in the direction of engine rotation) while pushing it into the pump housing.
8. Verify that all impeller blades are oriented correctly and none are bent backward or damaged during installation.
9. Reassemble the water pump housing with a new gasket, torquing bolts to the manufacturer's specifications in a cross-pattern.
10. Reinstall the lower unit onto the outboard, ensuring proper alignment of the driveshaft and water tube.
11. Reconnect the fuel line and perform a water test using a flushing attachment or in a test tank to confirm proper water flow from the telltale port.
12. Monitor engine temperature during the first few minutes of operation to ensure the cooling system is functioning correctly.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my specific Johnson or Evinrude engine?
A: Cross-reference your engine's horsepower, model year, and stroke type with the compatibility table above. You can also check your engine's serial number using our Johnson/Evinrude Serial Number Guide to confirm the exact model. If the specifications match and your original impeller has the same dimensions (6 blades, 38.35mm outer diameter, 11.20mm hub diameter), this part will fit.

Q: How often should I replace my water pump impeller?
A: Most marine technicians recommend replacing the impeller every 2–3 years or every 200–300 hours of operation, whichever comes first. If you notice overheating, reduced water flow from the telltale port, or visible cracks and missing blade tips during inspection, replace the impeller immediately regardless of age.

Q: What are the signs that my impeller is failing?
A: Common symptoms include overheating warnings, weak or no water discharge from the telltale outlet, steam from the engine, and reduced performance. If you observe any of these, shut down the engine immediately and inspect the impeller before operating again to prevent serious engine damage.

Q: Does this kit include the drive key, and why is it important?
A: Yes, this impeller comes with the drive key/pin included. The key locks the impeller to the driveshaft, ensuring it rotates with the shaft to pump water. A worn or missing key will cause the impeller to slip, resulting in no water circulation and rapid engine overheating.

Q: Can I use this impeller on both 2-stroke and 4-stroke engines?
A: Absolutely. This impeller is compatible with both 2-stroke models (4HP, 4.5HP, 8HP from 1980–1997) and 4-stroke models (5HP, 6HP from 1998 onward) as listed in the compatibility chart, provided they use OEM part number 389576.

Q: Is this an OEM impeller or an aftermarket replacement?
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.