Water Pump Repair Kit – Fits Yamaha F15, F20, F9.9 4-Stroke Outboards (Replaces 6AH-W0078-00)

Water Pump Repair Kit – Fits Yamaha F15, F20, F9.9 4-Stroke Outboards (Replaces 6AH-W0078-00)

This water pump repair kit is designed for a range of Yamaha 4-Stroke outboards, including models F9.9, F13.5, F15, and F20 (2007–2017). It is engineered to fit various F-series engines such as the F15C and F20B, providing a complete solution for servicing your engine's cooling system.

The kit serves as a direct replacement for Yamaha OEM part numbers 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00, and aftermarket Sierra kits 18-3479 and 18-3484 (which includes the housing).

• Engineered for direct OEM-replacement fit and performance.
• Kit includes all necessary components for a full water pump rebuild.
• Restores cooling system 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 (6AH-44311-00-00)
• 1 x Cartridge Insert (63V-44322-00-00)
• 1 x Water Seal Damper (6L2-44367-00-00 / 6L2-44367-01-00)
• 1 x Impeller (63V-44352-01-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-49046-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 2 x Dowel Pin (93604-12M07-00)
• 4 x Bolt with Washer (97095-08045-00)
• 2 x Plate (63V-44328-01-00)

Installation Guide

1. Safety First: Disconnect the battery and shift linkage before beginning work.
2. Lower Unit Removal: Remove the lower unit mounting bolts and carefully lower the gearcase from the outboard.
3. Disassemble Pump: Unbolt and remove the old water pump housing to access the impeller and other components.
4. Clean Surfaces: Thoroughly clean the driveshaft and mounting surfaces where the new pump will sit.
5. Component Removal: Take out the old impeller, woodruff key, wear plate, and seals.
6. Install New Seals: Place the new gaskets, O-rings, and seals into the new housing.
7. Install Impeller: Position the new woodruff key on the driveshaft flat spot, then slide the new impeller on, turning the shaft clockwise to bed the vanes.
8. Assemble Housing: Install the new cartridge insert and outer plate over the impeller.
9. Secure Housing: Align and install the new water pump housing, tightening the bolts to the manufacturer's specified torque.
10. Reattach Lower Unit: Carefully reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube align properly.
11. Final Connections: Reconnect the shift linkage and battery terminals.
12. Test: Start the engine in a water source (use flush muffs or run in water) and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Yamaha engine?
A: Check your engine's model and year against the "Compatible Engine Models" table. For Yamaha owners, we highly recommend using the Yamaha Serial Number Guide to verify your exact model details before ordering.

Q: What are the signs that my water pump needs to be replaced?
A: Common signs include a weak or non-existent water stream from the tell-tale outlet, engine overheating alarms, or visible damage (cracks, melted plastic) to the old pump housing or impeller.

Q: How often should I replace my outboard's water pump impeller?
A: As a general maintenance rule, it is recommended to inspect and/or replace the water pump impeller and gaskets annually or every 100 hours of use, whichever comes first, to prevent engine damage from overheating.

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.