Water Pump Impeller – Fits Johnson/Evinrude 40-75 HP (1979-1989) (Replaces 396809, 777214)

Water Pump Impeller – Fits Johnson/Evinrude 40-75 HP (1979-1989) (Replaces 396809, 777214)

This water pump impeller is designed for Johnson/Evinrude 2-Stroke outboard motors ranging from 40 to 75 HP, manufactured between 1979 and 1989, specifically for models with the small water pump housing.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 396809, 0396809, 777214, 0777214, 0777828, Mercury 878883, Sierra 18-3368, and CEF 500346C.

• Engineered for direct installation in small housing water pump assemblies.
• Features a durable rubber housing and a key drive connection.
• Includes the necessary drive key for a complete installation.

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

• 1 x Water Pump Impeller (396809, 777214)
• 1 x Plastic Key (Included)

Installation Guide

1. Safety First: Disconnect the battery terminals before beginning work.
2. Access Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the outboard's main leg.
3. Open Pump Housing: Locate the water pump assembly on top of the lower unit. Remove the bolts to lift off the housing cover.
4. Remove Old Impeller: Take note of the vane direction. Remove the old impeller and the plastic drive key from the driveshaft.
5. Clean and Inspect: Thoroughly clean the inside of the pump housing and wear plate. Check for scoring, warping, or corrosion and replace if necessary.
6. Install New Key & Impeller: Insert the new drive key into the driveshaft. Slide the new impeller onto the shaft, aligning its keyway.
7. Seat the Vanes: While pushing down gently, turn the driveshaft clockwise to correctly bend the impeller vanes into position within the housing.
8. Reassemble: Reinstall the housing cover, ensuring a proper seal. Tighten bolts to the manufacturer-specified torque.
9. Reattach Lower Unit: Guide the lower unit back into position, ensuring the driveshaft, shift shaft, and water tube align correctly. Securely fasten the bolts.
10. Test Operation: Reconnect the battery. Start the engine in water and confirm a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?

This impeller is designed for Johnson/Evinrude 40-75 HP 2-stroke outboards from 1979-1989 using the small water pump housing. To ensure compatibility, check your engine model against the "Compatible Engine Models" list and verify your original part number with our cross-reference table. Key dimensions are Blade Diameter (B): 70 mm, Hub Diameter (A): 16.04 mm, and Height (C): 22.3 mm.

What are the signs of a failing water pump impeller?

Common symptoms include the engine overheating, a weak or intermittent water stream from the tell-tale outlet, or visible damage such as cracked, brittle, or permanently bent rubber vanes on the old impeller upon inspection.

How often should I replace the water pump impeller?

As a critical part of preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years. Replacement should occur more frequently if the engine is operated in saltwater, sandy, or silty conditions.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.