Water Pump Impeller – Fits Johnson/Evinrude 1.2HP, 2HP, 4HP, 6HP & 60HP (Replaces 387361, 763735, 777831)

Water Pump Impeller – Fits Johnson/Evinrude 1.2HP, 2HP, 4HP, 6HP & 60HP

This water pump impeller is designed for a range of Johnson/Evinrude 2-stroke outboard motors, including 1.2HP, 2HP, 4HP, and 6HP models from 1976–1990, as well as specific 60HP models. It serves as a direct-fit replacement, manufactured to meet or exceed original equipment specifications for cooling performance and durability.

It provides a direct replacement for multiple Johnson/Evinrude and aftermarket part numbers, ensuring wide compatibility. Please verify your specific engine model and original part number before ordering.

• Installation Method: Direct OEM-style replacement
• Included Components: Impeller. Some packages may also include a key pin (0321130).
• Material Construction: High-durability neoprene rubber with a brass hub insert.

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 (387361)
• 1 x Lockwasher (for 60 HP models) (Note: included only with some packages)
• 1 x Key Pin (0321130) (Note: included only with some packages)

Installation Guide

1. Disconnect Power: Ensure the engine is off and the battery is disconnected.
2. Drain Gearcase Oil: Place a drain pan under the lower unit and remove the drain/fill plugs to empty the gear oil.
3. Remove Lower Unit: Unbolt the lower unit (gearcase) from the upper engine housing.
4. Access the Water Pump: With the lower unit removed, locate and unbolt the water pump housing.
5. Remove Old Impeller: Note the orientation of the old impeller fins. Remove the old impeller and the key pin from the driveshaft.
6. Clean Housing: Thoroughly clean the inside of the pump housing and wear plate, inspecting for scores or damage.
7. Install New Impeller: Seat the new key pin in the shaft. Slide the new impeller onto the driveshaft, rotating it clockwise to bend the fins correctly.
8. Reassemble Pump: Replace the housing and gasket, ensuring a proper seal. Tighten bolts to the manufacturer's torque specifications.
9. Reattach Lower Unit: Secure the lower unit back onto the engine housing.
10. Refill Gearcase Oil: Fill the gearcase with the recommended marine gear lubricant from the bottom fill hole until it flows from the top hole, then replace both plugs.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
First, check the "Compatible Engine Models" table on this page. Cross-reference your engine's brand, horsepower, and year. Second, verify your existing part number against the "Part Number Cross-Reference" table to ensure it matches one of the listed OEM or aftermarket numbers.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "telltale" outlet, and in some cases, a rattling noise from the lower unit. A damaged impeller cannot effectively cool the engine.

How often should I replace the impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage (e.g., hours run, saltwater vs. freshwater operation). Frequent use in sandy or silty water may require more frequent replacement.

Is everything I need for installation included?
The package contains the impeller itself. A key pin and lockwasher are included in some, but not all, packages. Please check the "Package Contents" section for details. Gaskets or seals are not included unless specified.

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.