Water Pump Impeller – Fits Evinrude Johnson 2–6 HP (Replaces 387361, 763735)

Water Pump Impeller – Fits Evinrude Johnson 2–6 HP (Replaces 387361, 763735)

This water pump impeller is designed for specific Evinrude Johnson outboard engines, including 2 HP (1985–1990), 4 HP (1976–1980) models with a 90-degree gearcase, and 6 HP (1979) models. It provides a reliable direct replacement fit to restore your engine's cooling system performance.

This part directly replaces Johnson/Evinrude part numbers 387361, 763735, and 777831; Sierra 18-3090; and Mallory 9-45210.

• Features six durable rubber blades with a brass insert for longevity.
• Designed for direct OEM replacement for a straightforward installation.
• Engineered to provide reliable cooling system operation and prevent overheating.

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 387361/763735)
• 1 x Impeller Key (Please note: The key is included in most packages but is not guaranteed. Please verify if your application requires a new key.)

Installation Guide

Professional installation is recommended. The general steps are outlined below:

1. Disconnect the spark plug leads and shift the outboard into neutral.
2. Remove the lower unit (gearcase) by undoing the mounting bolts. Be prepared for it to drop.
3. Locate the water pump assembly on top of the gearcase. Unbolt and remove the pump housing cover.
4. Slide the old impeller off the driveshaft. If it's stuck, you may need to carefully cut it off.
5. Clean any debris or corrosion from the housing interior and pump plates.
6. Lightly grease the new impeller with marine grease and slide it onto the driveshaft, turning the shaft clockwise to bend the vanes correctly.
7. Install the new impeller key if required for your model.
8. Reinstall the water pump housing and torque the bolts to the manufacturer's specification.
9. Re-attach the lower unit to the engine, ensuring the driveshaft and water tube align correctly.
10. Reconnect spark plug leads, start the engine in water, and confirm a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?

A: First, check your original part number against our "Part Number Cross-Reference" table. This part replaces OEM numbers 387361, 763735, and 777831. Second, consult the "Compatible Engine Models" table to verify your exact model and year range. For the 4 HP model, ensure you have the 90-degree gearcase.

Q: What are the common signs that my impeller needs replacing?

A: The most common sign of a failing impeller is your engine overheating. Other indicators include a weak or intermittent water stream from the "tell-tale" outlet port. During a visual inspection, a worn impeller may have cracked, brittle, or missing vanes.

Q: How often should I replace my water pump impeller?

A: As a general rule, we recommend inspecting your impeller annually and replacing it every 1-2 years or every 100-200 hours of use, whichever comes first. If you frequently operate in saltwater or sandy/murky water, you should replace it more often.

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.