Water Pump Repair Kit – Fits Yamaha 225-350 HP 4-Stroke Outboards (Replaces 6CE-W0078-00-00, 6CE-W0078-01-00)

Water Pump Repair Kit – Fits Yamaha 225-350 HP 4-Stroke Outboards

This water pump repair kit fits a range of Yamaha 4-Stroke V6 outboard motors, including 225HP, 250HP, 300HP, and 350HP models (2007-2015) from the F225, F250, F300, F350, and VF250 series.

It is a direct replacement for Yamaha part numbers 6CE-W0078-00-00 / 6CE-W0078-01-00 and Sierra part 18-3470.

• Installation Method: Direct replacement design ensures a precise fit without modifications.
• Key Components Included: Contains a new impeller, key, o-ring, mounting bolts, oil seals, and 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 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 Impeller (Replaces 6CE-44352-00)
• 1 x Key (Replaces 90280-04M05-00)
• 1 x O-Ring (Replaces 93210-94003-00)
• 4 x Bolt (Replaces 97095-08045-00)
• 2 x Oil Seal (Replaces 93104-22M07-00)
• 1 x Insert (Replaces 6AW-44322-00-00)

Installation Guide

1. Disconnect Power: Disconnect the battery and ensure the engine cannot be started.
2. Drain Gearcase: Drain the gearcase lubricant to prevent spills.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the upper engine housing.
4. Access Water Pump: Locate and unbolt the water pump housing cover.
5. Remove Old Components: Take out the old impeller, key, wear plate, and any seals or gaskets. Note their orientation.
6. Clean and Inspect: Thoroughly clean the housing surfaces and inspect for any scoring or damage.
7. Install New Kit: Lightly grease the new o-rings and install the new wear plate and seals from the kit.
8. Install Impeller: Slide the new woodruff key onto the driveshaft, then install the new impeller. Turn the driveshaft clockwise while pushing down to seat the vanes correctly.
9. Reassemble Housing: Secure the water pump housing with the new bolts, tightening them to the manufacturer's specified torque.
10. Reinstall Lower Unit: Re-attach the lower unit to the engine, ensuring the driveshaft and water tube align correctly.
11. Refill and Test: Refill the gearcase with fresh lubricant. Reconnect the battery and test the engine in water, confirming a strong, steady stream from the tell-tale outlet.

Troubleshooting & FAQ

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

A: Start by checking your engine's model, horsepower, and year against our "Compatible Engine Models" table. For 100% certainty, cross-reference the OEM part number stamped on your original water pump housing or found in your service manual with the numbers listed in our "Part Number Cross-Reference" section. If you need help identifying your Yamaha model, use our linked guides.

Q: What are the signs of a faulty water pump impeller?

A: The most common symptom is your engine overheating at idle or low speeds. Other signs include a weak or non-existent water stream from the "tell-tale" outlet, a melted water pump housing, or a brittle/cracked impeller discovered during routine inspection.

Q: How often should the water pump kit be replaced?

A: As a preventative maintenance measure, we recommend replacing the water pump impeller and seals every 1 to 2 years, or every 100-200 operating hours. This interval may be shorter if you frequently operate in sandy, silty, or saltwater environments.

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.