389576 Water Pump Impeller for Evinrude Johnson OMC BRP 4HP 4.5HP 5HP 6HP 8HP | JLM Marine

Water Pump Impeller 389576 – Fits Johnson Evinrude OMC BRP 4HP–8HP Outboards

This aftermarket water pump impeller is precision-engineered for Johnson Evinrude OMC BRP outboard motors ranging from 4HP to 8HP. Designed to maintain optimal cooling performance, it directly replaces OEM part number 389576 and fits a wide range of 2-stroke and 4-stroke models from 1980 through 1997 and beyond.

Direct Replacements: Johnson Evinrude 389576 / 0389576 | Sierra 18-3091 | CEF 500358 | Mallory 9-45214

• 6-blade impeller design for reliable water flow
• Fits both 2-stroke (4HP, 4.5HP, 8HP) and 4-stroke (5HP, 6HP) engines
• Compact dimensions: 38.35mm outer diameter, 17.78mm height

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

Your package includes:

• 1× Outboard Impeller (389576)

Installation Guide

1. Disconnect the spark plug wire to prevent accidental engine start during service.
2. Remove the lower unit from the outboard motor following your engine's service manual.
3. Access the water pump housing by removing the mounting bolts and separating the pump cover.
4. Carefully extract the old impeller from the pump housing using a suitable tool; note the direction of the blades.
5. Clean the pump housing thoroughly to remove any debris, corrosion, or old gasket material.
6. Apply marine-grade grease to the new impeller blades and inner bore to ease installation and prevent dry-running damage.
7. Insert the new impeller into the housing, aligning the keyway with the drive pin and ensuring blades curve in the correct rotation direction.
8. Replace the pump housing gasket and cover, tightening bolts evenly to manufacturer torque specifications.
9. Reinstall the lower unit onto the outboard, ensuring all shift linkages and seals are properly seated.
10. Reconnect the spark plug wire and perform a water flow test in a test tank or on-the-water to confirm proper cooling.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson or Evinrude outboard?
A: Cross-reference your engine's HP, model year, and stroke type with the compatibility table above. Also verify your OEM impeller part number matches 389576, or any of the aftermarket equivalents listed (Sierra 18-3091, CEF 500358, Mallory 9-45214).

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend annual replacement or every 300 operating hours, whichever comes first. If you notice overheating, reduced water flow from the tell-tale, or visible blade damage, replace immediately.

Q: What are the signs of a failing impeller?
A: Common symptoms include reduced or no water discharge from the tell-tale (pilot hole), engine overheating alarms, steam from the powerhead, and loss of performance. Inspect the impeller if any of these occur.

Q: Can I install this impeller myself, or do I need a mechanic?
A: If you have basic mechanical skills and the proper tools, DIY installation is possible. However, professional installation is recommended to ensure correct alignment, torque specifications, and to avoid damage to seals or housings.

Q: Is this an OEM part or 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.