Water Pump Repair Kit - Fits Yamaha 4HP & 5HP 2-Stroke (Replaces 6E0-W0078-A2-00)

Water Pump Repair Kit – Fits Yamaha 4HP & 5HP 2-Stroke (Replaces 6E0-W0078-A2-00)

This water pump repair kit is designed for Yamaha 4HP and 5HP 2-Stroke outboards from the 1996 model year. It provides a complete solution for servicing your engine's cooling system, including the impeller, housing, gaskets, and all necessary mounting hardware.

This kit is a direct replacement for Yamaha part numbers 6E0-W0078-A2-00, 6E0-W0078-02-00, 6E0-W0078-01-00, and 6E0-W0078-00-00.

• Includes all necessary components for a complete water pump service.
• Engineered for direct OEM replacement and fitment.
• Restores cooling performance to prevent engine 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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Water Pump Housing (6E0-44311-00-00)
• 1 x Water Pump Gasket (6E0-44315-A0-00)
• 1 x Cartridge Insert (6E0-44322-02-00)
• 1 x Cartridge Outer Plate (6E0-44323-00-00)
• 1 x Impeller (6E0-44352-00-00)
• 1 x Water Seal Damper 2 (6E0-44366-00-00)
• 1 x Dowel Pin (93604-09066-00)
• 4 x Bolts (97080-06045-00)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is securely mounted before beginning.
2. Access the Lower Unit: Drain the gearcase oil. Unbolt and carefully remove the lower unit from the outboard.
3. Remove Old Pump: Unscrew the bolts securing the water pump housing and lift it off the driveshaft.
4. Inspect and Clean: Remove the old impeller, gaskets, and plates. Clean all mating surfaces thoroughly.
5. Install New Components: Place the new gasket and outer plate onto the lower unit.
6. Install Impeller: Apply a light coat of marine grease to the inside of the housing and to the new impeller. Slide the new impeller onto the driveshaft, rotating it clockwise to bend the vanes correctly.
7. Reassemble Pump: Install the cartridge insert and new housing. Secure it with the new bolts and tighten to the manufacturer's torque specifications.
8. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Bolt it securely.
9. Final Checks: Refill the gearcase with fresh oil. Reconnect the battery and start the engine, confirming a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?

A: This kit is specifically for Yamaha 4HP and 5HP 2-Stroke models from 1996 only. Please use our compatibility table and your engine's model number to verify fitment. Later models may require a different kit (e.g., 6E0-W0078-A5-00).

Q: What are the signs of a failing water pump?

A: The most common signs are a weak or non-existent water stream from the "tell-tale" outlet and an engine overheating alarm. Reduced cooling performance can cause serious engine damage if not addressed.

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

A: As a general maintenance rule, it is recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of operation, depending on usage and water conditions (e.g., saltwater vs. freshwater).

Q: Is this an OEM or aftermarket part?

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.