Water Pump Impeller – Fits Johnson/Evinrude OMC 10-25 HP (Replaces 375638, 389646, 775518)

Water Pump Impeller – Fits Johnson/Evinrude OMC 10-35 HP (Replaces 375638, 389646, 775518)

This aftermarket water pump impeller is engineered to meet or exceed OEM specifications, providing a reliable solution for maintaining your engine’s cooling system. It is designed for select Johnson and Evinrude 2-stroke outboard motors from 10 HP to 35 HP, covering models produced between 1949 and 1978.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and straightforward installation. Please verify compatibility with your specific engine model and year before ordering.

• Installation Method: Direct OEM replacement
• Fitting Type: 6-blade rubber impeller with a keyed driveshaft slot
• Package Includes: 1 x Water Pump Impeller

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 375638, 389646, 775518)

Explosion Diagram

Installation Guide

1. Safety First: Disconnect the engine's battery cables before beginning any work.
2. Access the Lower Unit: Remove the bolts that secure the lower unit (gearcase) to the engine's upper casing and carefully lower it.
3. Open Water Pump Housing: Locate the water pump assembly on top of the gearcase. Remove the bolts holding the housing cover in place.
4. Remove Old Impeller: Lift the housing and slide the old impeller off the driveshaft. Note the orientation of the old blades for reference.
5. Clean and Inspect: Clean any debris or corrosion from the inside of the pump housing and the base plate. Inspect for scoring or cracks.
6. Install New Impeller: Lightly lubricate the new impeller. Slide it onto the driveshaft and turn the shaft clockwise to bend the blades into the correct orientation as you press it down into the housing cup.
7. Reassemble: Reinstall the water pump housing, gaskets, and bolts. Secure the lower unit back onto the engine.
8. Test Operation: Reconnect the battery. Start the engine using a flush-muff or in the water to ensure the pump is creating a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this impeller fits my specific engine?
The most reliable method is to match your engine's original part number to the numbers in our cross-reference table. You can also consult your owner's manual or use the Johnson/Evinrude Serial Number Guide linked above to identify your model and its required parts.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, a weak or non-existent stream of water from the "tell-tale" outlet, or visible cracks and stiffness in the old impeller's rubber blades upon inspection.

How often should I replace my impeller?
For preventative maintenance, it is recommended to inspect your impeller annually and replace it every 1-2 years, depending on usage (especially in saltwater) and storage conditions. Never reuse an old impeller.

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.