Water Pump Repair Kit – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00)

Water Pump Repair Kit – Fits Yamaha F15C/F20 4-Stroke Outboards

This water pump repair kit is designed for Yamaha F15C and F20 four-stroke outboard engines from 2006 to 2023. It provides all the necessary components for a complete overhaul of your outboard's water pump assembly, ensuring optimal cooling performance and engine reliability.

This kit is a direct replacement for Yamaha OEM part numbers 6AH-W0078-00-00 and the updated version 6AH-W0078-02-00.

• Complete Kit: Includes a new housing, impeller, wear plates, seals, and hardware for a full service.
• Direct Replacement: Engineered to meet or exceed OEM specifications for a precise fit and reliable function.
• Engine Compatibility: Specifically fits Yamaha F15C and F20 4-stroke models.

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)
• 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 (97095-08045-00)
• 2 x Plate (63V-44328-01-00)

Installation Guide

Follow these general steps for installation. Always consult your engine's service manual for detailed instructions specific to your model.

1. Safety First: Disconnect the battery and ensure the engine is in a secure, stable position.
2. Access the Lower Unit: Drain the gearcase oil. Remove the bolts connecting the lower unit (gearcase) to the engine's midsection and carefully lower it.
3. Remove Old Pump: Unbolt and remove the water pump housing to expose the impeller and other components. Take note of their orientation.
4. Clean and Inspect: Thoroughly clean the mounting surfaces and inspect for any damage or excessive wear.
5. Install New Components: Lightly grease and install the new O-rings, plates, and seals. Slide the new impeller onto the driveshaft, ensuring the Woodruff key is correctly seated.
6. Install New Housing: Place the new housing over the impeller. You may need to turn the driveshaft clockwise to help the impeller vanes fold correctly.
7. Reassemble: Secure the new housing with the provided bolts, tightening them to the torque specified in your service manual.
8. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly. Refill the gearcase with fresh oil.
9. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and verify a steady stream of water from the "tell-tale" outlet.

Troubleshooting & FAQ

This kit is specifically for Yamaha F15C (2006–2023) and F20 (2006–2021) 4-stroke models. The best way to confirm is by matching the OEM part number, 6AH-W0078-00-00 or 6AH-W0078-02-00, with the number listed in your engine's service manual or parts diagram.

Common signs include a weak or non-existent stream of water from the tell-tale outlet, engine overheating alerts, or a melted water pump housing. Failure to replace a worn impeller can lead to severe engine damage.

As a general maintenance rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater, sandy/silty water). Always consult your owner's manual for specific service intervals.

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.

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.

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.