Water Pump Impeller – Fits Evinrude Johnson OMC 40-60 HP 1978-1986 (Replaces 389589, 777129)

Water Pump Impeller – Fits Evinrude Johnson OMC 40-60 HP 1978-1986 (Replaces 389589, 777129)

This water pump impeller is designed for Johnson/Evinrude outboard motors from 40-60 HP, specifically 2-stroke models made between 1978 and 1986. It is engineered to meet original equipment specifications for reliable cooling performance.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring wide compatibility for routine maintenance or repair.

• Engine Compatibility: Fits 40-60 HP Johnson/Evinrude 2-Stroke outboards (1978-1986).
• Replaces OEM Parts: 389589, 777129, 777827.
• Installation: Direct replacement designed for the small housing water pump assembly.

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 (Replaces 389589/777129/777827)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable and remove the engine cover.
2. Place the outboard in neutral and remove the bolts connecting the lower unit (gearcase) to the engine's leg.
3. Carefully lower the gearcase to expose the water pump assembly.
4. Remove the bolts securing the water pump housing cover to access the impeller.
5. Note the rotational direction of the old impeller's blades before sliding it off the drive shaft.
6. Thoroughly clean the impeller housing and wear plate, removing any old gasket material or debris.
7. Lightly coat the new impeller and the inside of the housing with marine grease.
8. Slide the new impeller onto the drive shaft, turning the shaft clockwise to correctly seat the impeller blades inside the housing cup.
9. Reinstall the water pump housing cover, ensuring any seals or gaskets are properly aligned. Torque bolts to manufacturer specifications.
10. Raise the lower unit back into position, carefully aligning the drive shaft, shift shaft, and water tube. Secure with bolts.
11. Reconnect the battery. Test the engine using a water supply (flushing muffs or in the water) and confirm a strong, steady stream from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: This impeller is for Johnson/Evinrude 40-60 HP 2-stroke outboards from 1978-1986. Please check the "Compatible Engine Models" and "Part Number Cross-Reference" tables on this page. It is crucial to verify it replaces your existing part numbers (389589, 777129, or 777827) and is for a small housing pump.

Q: What are the signs of a failing water pump impeller?
A: Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable drop in engine performance. A worn or damaged impeller cannot pump cooling water effectively.

Q: How often should I replace the impeller?
A: As a preventative maintenance item, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

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.