Water Pump Impeller – Fits Johnson/Evinrude OMC 4-8 HP Outboards (Replaces 389576, 433914)

Water Pump Impeller – Fits Johnson/Evinrude OMC 4-8 HP Outboards (Replaces 389576, 433914)

This water pump impeller is designed for Johnson/Evinrude 4, 4.5, 5 HP 2-Stroke (1980–1997), 5 HP 4-Stroke (1996–2005), 6 HP 2-Stroke & 4-Stroke (1984–2005), 7.5 HP 2-Stroke (1980–1983), and 8 HP 2-Stroke (1980–2005) outboard motors.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring wide compatibility for a straightforward installation.

• Direct Fit: Engineered to meet OEM specifications for a direct, hassle-free replacement.
• Durable Construction: Made with a robust neoprene rubber body and a brass hub for reliable performance and corrosion resistance.
• Complete Kit: Includes one water pump impeller and a new key for a full replacement.

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 with Key (Replaces 389576)

Explosion Diagram

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Locate and unbolt the lower unit from the outboard leg.
3. Carefully separate the lower unit, disconnecting the shift linkage if necessary.
4. Remove the water pump housing bolts and lift the housing off.
5. Note the rotational direction of the old impeller's blades before removing it.
6. Remove the old impeller, key, gaskets, and wear plate.
7. Thoroughly clean all surfaces of the housing and plate.
8. Install the new wear plate, gaskets, drive key, and impeller.
9. Lubricate the new impeller and the inside of the housing with marine grease.
10. Reinstall the pump housing, making sure the impeller blades are oriented correctly (in the direction of driveshaft rotation).
11. Reattach the lower unit, connect the shift linkage, and bolt it securely.
12. Reconnect the battery and test run the engine with a reliable water supply to ensure proper cooling.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson/Evinrude engine?
A: Check your engine's model, horsepower (HP), and year range against our "Compatible Engine Models" table. You can also confirm the fit by matching your old part number to the ones listed in the "Part Number Cross-Reference" section.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include the engine overheating, a weak or non-existent water stream from the tell-tale outlet, or finding the old impeller is dry, cracked, or has broken blades upon inspection.

Q: How often should I replace my impeller?
A: For preventative maintenance, we recommend inspecting your impeller annually and replacing it every 1-2 years. Replacement may be needed more frequently if you often operate in sandy, silty, or debris-heavy water.

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.