Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00)

Water Pump Repair Kit – Fits Yamaha 4.2L V6 225–300HP Outboards

This water pump repair kit is designed for Yamaha 4-Stroke 225 HP to 300 HP F225, F250, F300, and VF250 4.2L V6 outboard engines from 2007 to 2015. It provides all necessary components for a complete service of the lower unit's water pump assembly.

This kit is a direct replacement for Yamaha part numbers 6CE-W0078-00-00, 6CE-W0078-01-00, 6CE-W0078-02-00, and Sierra 18-3470 / 18-3471.

• Includes all required components for a complete water pump rebuild.
• Engineered for Yamaha 4.2L V6 four-stroke models.
• Installs in the lower unit.

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 Impeller (6CE-44352-00-00)
• 1 x Woodruff Key (90280-04M05-00 / 90280-04002-00)
• 1 x O-Ring (93210-94003-00)
• 4 x Bolt (97095-08045-00 / 90119-08191-00)
• 2 x Oil Seal (93104-22M07-00)
• 1 x Insert Cartridge (6AW-44322-00-00)
• 1 x Outer Plate, Cartridge (6CE-44323-01-00)
• 1 x Water Pump Gasket (6CE-44315-00-00)
• 2 x Dowel Pin (93606-12019-00)
• 1 x O-Ring (93210-37M67-00)

Installation Guide

1. Disconnect Power: Start by disconnecting the battery.
2. Drain Gear Lube: Drain the gear lube from the lower unit to prevent spills.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit from the outboard engine.
4. Access Water Pump: Unscrew the bolts on the water pump housing and remove it to expose the impeller.
5. Remove Old Components: Take out the old impeller, gaskets, wear plate, and seals. Note their orientation.
6. Clean Surfaces: Thoroughly clean all mating surfaces to ensure a proper seal.
7. Install New Kit: Assemble the new components from the kit, starting with the base gasket and plate.
8. Install Impeller: Slide the new impeller onto the driveshaft, ensuring the Woodruff key is in place and the vanes are turned in the correct direction (typically clockwise).
9. Reassemble Housing: Install the new housing and seals, then tighten the bolts to the manufacturer's recommended torque.
10. Reinstall Lower Unit: Mount the lower unit back onto the engine and refill it with fresh gear lube.
11. Test Operation: Reconnect the battery. Safely test the engine with a water supply to confirm a strong and steady stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my Yamaha engine?

First, check the 'Compatible Engine Models' table on this page to ensure your specific model and year range are listed. You can also verify fitment by matching your existing water pump parts to the numbers in our 'Part Number Cross-Reference' table.

How often should I replace my water pump impeller?

As a general rule, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 hours of operation, whichever comes first. Refer to your engine’s service manual for the most accurate maintenance intervals.

What are the signs of a failing water pump?

Common symptoms include the engine overheating at idle or low speeds, a weak or intermittent water stream from the tell-tale outlet, or a melted/brittle impeller discovered during inspection.

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.