Water Pump Repair Kit – Fits Yamaha 4HP, 5HP, 6HP 4-Stroke Outboards

Water Pump Repair Kit – Fits Yamaha 4HP, 5HP, 6HP 4-Stroke Outboards

This water pump repair kit provides all the necessary components to restore the cooling system on Yamaha 4HP, 5HP, and 6HP 4-stroke outboard motors. It is designed to fit models from 1999 through the current model year, including the F4A/F4B, F5A, and F6C series.

This kit is a direct replacement for Yamaha OEM part numbers: 6E0-W0078-00, 6E0-W0078-01, 6E0-W0078-02, 6E0-W0078-A2, 6E0-W0078-A200, 6EE-W0078-00, and 6EE-W0078-01.

• Engineered for a direct OEM-equivalent fit and function.
• Compatible with a wide range of Yamaha 4, 5, and 6 HP 4-stroke outboards.
• Contains all required gaskets, seals, plates, and the impeller for a complete service.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers. Note that two main kit versions exist for different model years.

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

Note: Two versions of this kit exist. Please confirm your engine's required OEM part number to ensure you receive the correct components.

For Kit replacing OEM P/N: 6E0-W0078-00, 6E0-W0078-01, 6E0-W0078-02

• 1 x Housing, Water Pump (6E0-44311-00)
• 1 x Gasket, Water Pump (6E0-44315-A0)
• 1 x Inner Water Pump (6E0-44322-02)
• 1 x Plate (6E0-44323-00)
• 1 x Damper (6E0-44366-00)
• 1 x Impeller (6E0-44352-00)
• 2 x Dowel Pin (93604-18080, 93604-09066)
• 1 x Plate (6E0-44328-00)
• 4 x Bolts

For Kit replacing OEM P/N: 6EE-W0078-00, 6EE-W0078-01

• 1 x Housing, Water Pump (6EE-G4311-00-00)
• 1 x Gasket, Water Pump (6EE-G4315-00-00)
• 1 x Insert, Cartridge (6BX-44322-00-00)
• 1 x Outer Plate, Cartridge (6BX-44323-00-00)
• 1 x Damper, Water Seal 2 (67D-44366-00-00)
• 1 x Impeller (6E0-44352-00-00)
• 4 x Bolt (97080-06045-00)
• 2 x Pin, Dowel (93604-18080-00)

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Shift the outboard into neutral.
3. Drain the gearcase oil by removing the drain and vent plugs.
4. Remove the bolts securing the lower unit (gearcase) to the midsection.
5. Carefully lower and separate the gearcase from the engine.
6. Unbolt and remove the old water pump housing assembly from the driveshaft.
7. Clean the mounting surfaces and inspect the driveshaft for wear or corrosion.
8. Install the new key, impeller, gaskets, plate, and housing in the correct order. Ensure the impeller vanes are oriented correctly.
9. Lightly grease the new components before assembly.
10. Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
11. Refill the gearcase with fresh oil.
12. Start the engine in a test tank or with a flushing attachment and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: Start by checking the Compatible Engine Models table. This kit fits a wide range of Yamaha 4HP, 5HP, and 6HP 4-stroke models. The most important step is to match the OEM part number from your engine's parts list to the numbers this kit replaces (6E0-W0078-XX or 6EE-W0078-XX). Yamaha made changes around 2009, so verifying by serial number and part number is crucial.

Q: What is the difference between the 6E0 and 6EE series kits?
A: The two kit series correspond to different manufacturing periods and have different components, particularly the water pump housing, gaskets, and internal cartridge parts. The 6E0 series is for earlier models (roughly 1999-2008), while the 6EE series is for later models (roughly 2009-Present). Always verify which part number your specific engine requires.

Q: My engine is overheating. Could a bad water pump be the cause?
A: Yes, overheating at idle or low speeds is a classic symptom of a worn or failed water pump impeller. A weak or non-existent stream of water from the tell-tale outlet is another key indicator. For preventative maintenance, it is recommended to replace the water pump impeller every 1-2 seasons, depending on usage.

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.