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

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller
$15.99
$15.99
Subtotal: $15.99

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Water Pump Impeller – Fits Johnson/Evinrude 4 - 8 HP Outboards (Replaces 389576, 433914) - JLM Marine Boat Parts Limited

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

$15.99

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

$15.99

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

This water pump impeller is designed for a range of Johnson/Evinrude outboard motors, including 4HP, 4.5HP, 5HP, 6HP, and 8HP 2-Stroke models (1980-1997) as well as 5HP and 6HP 4-Stroke models (1998 and up). It serves as a reliable replacement to maintain your engine's cooling system performance.

Engineered as a direct replacement for multiple OEM and aftermarket parts, this component ensures broad compatibility. It cross-references with Johnson/Evinrude 389576, 433914, 436137, 777822, 778225; Sierra 18-3091; Mallory 9-45214; GLM Marine 89500; and CEF 500354/500358.

  • Constructed from high-quality neoprene rubber with a durable brass center hub.
  • Features 6 precision-molded blades for efficient water flow.
  • Engineered as a direct replacement part, though professional installation is recommended.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Johnson/Evinrude 389576 / 433914 / 436137 / 777822 / 778225
Sierra 18-3091
Mallory 9-45214
GLM Marine 89500
CEF 500354 / 500358

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Johnson/Evinrude Outboard 4 2-Stroke 1980-1997 389576 Deluxe models
Johnson/Evinrude Outboard 4.5 2-Stroke 1980-1997 389576
Johnson/Evinrude Outboard 5 4-Stroke 1998 and up 389576
Johnson/Evinrude Outboard 6 4-Stroke 1998 and up 389576
Johnson/Evinrude Outboard 8 2-Stroke 1986-1997 389576

Technical Specifications

Specification Value
Product Type Water Pump Impeller
Installation Direct replacement, professional installation suggested
Housing Material Neoprene rubber with brass hub
Dimensions Overall Diameter: 38.4 mm (1.51 in), Height: 17.9 mm (0.70 in), Shaft Size: 11.2 mm (0.44 in)
Weight 34 g (1.05 oz)
Number of Blades 6
Other Technical Attributes Brass center hub for durability

Package Contents

  • 1 x Water Pump Impeller (Replaces 389576/433914/436137/777822/778225)

Installation Guide

  1. Safety First: Disconnect the battery and remove the engine cover.
  2. Access the Lower Unit: Unbolt and carefully lower the gearcase from the upper engine housing.
  3. Open the Pump Housing: Remove the bolts securing the water pump cover to access the impeller.
  4. Note Orientation: Observe the direction of the old impeller's blades before removal.
  5. Remove Old Impeller: Slide the old impeller off the driveshaft, removing the drive key if present.
  6. Clean and Inspect: Clean any debris from the housing and inspect it for scoring, cracks, or wear.
  7. Prepare New Impeller: Lightly lubricate the new impeller and the inside of the pump housing with marine grease.
  8. Install New Impeller: Slide the new impeller onto the driveshaft. Rotate the shaft in its normal direction of operation (usually clockwise) to bend the blades correctly into the housing.
  9. Reassemble: Re-install the water pump cover and a new gasket, tightening bolts to the manufacturer's specified torque.
  10. Re-attach Lower Unit: Secure the lower unit back onto the engine.
  11. Test Operation: Reconnect the battery and start the engine in water, confirming a steady stream from the cooling system's tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: Carefully check the "Compatible Engine Models" table, matching your engine's brand, model, horsepower, and year range. For Johnson/Evinrude engines, using the provided serial number guide is a reliable way to verify your exact model and year if you are unsure.

Q: What are the signs of a failing water pump impeller?
A: The most common signs are the engine overheating, a weak or nonexistent water stream from the "tell-tale" outlet, or an alarm from your engine's warning system. In severe cases, you may find a melted water pump housing upon inspection.

Q: How often should I replace the water pump impeller?
A: As a preventative maintenance measure, we recommend replacing the impeller every 1-2 years. If you frequently operate your boat in sandy, silty, or saltwater conditions, an annual replacement is advised to ensure reliability.

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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