Water Pump Repair Kit with Housing for Yamaha F15C and F20 4-Stroke Outboards – Replaces 6AH-W0078-00-00
Water Pump Repair Kit with Housing for Yamaha F15C and F20 4-Stroke Outboards – Replaces 6AH-W0078-00-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit with Housing for Yamaha F15C and F20 4-Stroke...
Water Pump Repair Kit with Housing for Yamaha F15C and F20 4-Stroke Outboards – Replaces 6AH-W0078-00-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit with housing is designed for selected Yamaha F15C and F20 four-stroke outboards. It replaces the Yamaha OEM water pump repair kit reference 6AH-W0078-00-00 and is supplied as a complete service kit with the water pump housing, impeller, wear plates, seals, key, dowel pins, and mounting hardware listed below.
Catalog applications identify this water pump kit for Yamaha F15C and F20 four-stroke models in the 2006–2017 application range. Model suffix, year, shaft configuration, and serial-number conditions can affect fitment, so compare your original assembly and OEM reference before ordering.
- Complete water pump repair kit with housing.
- Includes the primary wear, sealing, drive, and mounting components needed for a water pump service.
- Aftermarket replacement for the listed Yamaha OEM reference.
- Suitable for service or replacement of a worn water pump assembly when the application is confirmed.
Part Number Matrix
These references are provided for identification and cross-reference purposes. They should not be treated as interchangeable unless the application and package configuration match.
| Brand | Part Number | Reference Type | Notes |
|---|---|---|---|
| Yamaha | 6AH-W0078-00-00 | OEM reference | Water pump repair kit reference for selected F15C and F20 applications. |
| Yamaha | 6AH-W0078-01-00 | OEM catalog reference | Listed for selected later F15 and F20 applications; verify the exact engine year and model. |
| Yamaha | 6AH-W0078-02-00 | OEM catalog reference | Listed for selected later F15 and F20 applications; verify the exact engine year and model. |
| Sierra | 18-3479 | Aftermarket cross-reference | Water pump kit reference; confirm housing configuration before using as a cross-reference. |
| Sierra | 18-3484 | Component reference | Water pump housing reference, not a complete-kit equivalence. |
Engine & Model Compatibility
Catalog evidence identifies the following broad application. Always verify the complete model designation, year, shaft configuration, and OEM reference against your engine before installation.
| Brand | Model Family | Rated HP | Stroke | Application Years | OEM Reference | Fitment Notes |
|---|---|---|---|---|---|---|
| Yamaha | F15C | 15 | 4-Stroke | 2006–2017 application range | 6AH-W0078-00-00 | Verify the full model suffix, shaft configuration, year, and serial number. |
| Yamaha | F20 | 20 | 4-Stroke | 2006–2017 application range | 6AH-W0078-00-00 | Verify the full model suffix, shaft configuration, year, and serial number. |
Important: The available catalog relationship confirms the F15C and F20 application family. It does not confirm every F15, F20, F9.9, F13.5, or other Yamaha model. Do not rely on horsepower alone when confirming fitment.
Technical Specs
- Product Type
- Outboard water pump repair kit with housing
- Application
- Selected Yamaha F15C and F20 4-stroke outboards
- Installation
- Replacement water pump service assembly; confirm fitment before installation
- Housing
- Included
- Housing Material
- Plastic/composite aftermarket housing
- Manufacturer Status
- Aftermarket replacement; not a Yamaha Genuine OEM component
- Primary OEM Reference
- 6AH-W0078-00-00
What's in the Box
- 1 x Water pump housing, OEM reference 6AH-44311-00-00
- 1 x Cartridge insert, OEM reference 63V-44322-00-00
- 1 x Water seal damper, OEM reference 6L2-44367-00-00
- 1 x Impeller, OEM reference 63V-44352-01-00
- 1 x Woodruff key, OEM reference 664-44338-00-00
- 1 x O-ring, OEM reference 93210-49046-00
- 1 x Cartridge outer plate, OEM reference 68T-44323-00-00
- 2 x Dowel pins, OEM reference 93604-10M03-00
- 4 x Bolts with washers, OEM reference 97095-08045-00
- 2 x Plates, OEM reference 63V-44328-01-00
Installation Notes
- Disconnect the battery cables and follow the outboard manufacturer's safety procedures before beginning service.
- Place the outboard in neutral and remove the lower-unit mounting hardware. Carefully separate the lower unit from the upper housing.
- Remove the old water pump housing and disassemble the existing impeller, plates, seals, key, and related hardware.
- Clean the mating surfaces and inspect the drive shaft, pump plate, keyway, and water passages for wear, corrosion, or blockage.
- Install the supplied key, impeller, plates, seal, insert, and housing in the correct order. Ensure the impeller is correctly positioned on the drive shaft.
- Install the supplied dowel pins and bolts with washers. Tighten fasteners to the torque specification in the Yamaha service manual for your exact engine.
- Reinstall the lower unit using the manufacturer's recommended procedure and check that the shift mechanism engages correctly.
- Test the outboard in a suitable water-filled test tank or with an appropriate flushing device. Confirm a steady tell-tale stream and monitor for overheating before returning the boat to service.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Confirm that your engine is a Yamaha F15C or F20 four-stroke in the applicable year range, then compare the full model designation, shaft configuration, serial-number range, original pump assembly, and OEM reference 6AH-W0078-00-00. Horsepower by itself is not sufficient for fitment confirmation.
Does this kit include the water pump housing?
Yes. This package is the with-housing configuration and includes one water pump housing together with the impeller, insert, plates, seal, key, O-ring, dowel pins, and four bolts with washers listed in the package contents.
Is this a Yamaha Genuine OEM kit?
No. This is an aftermarket replacement kit. Yamaha part numbers are shown only as OEM reference numbers for identification and fitment comparison.
Are Sierra 18-3479 and 18-3484 the same product?
No. Catalog information identifies Sierra 18-3479 as a water pump kit reference and Sierra 18-3484 as a water pump housing reference. They should not be treated as the same complete package or used to infer identical contents.
What are common signs of a worn water pump?
Possible symptoms include a weak or intermittent tell-tale stream, overheating at idle or low speed, steam from the exhaust, or reduced cooling-water flow. Inspect the impeller and related pump components when these symptoms occur.
How often should the water pump be serviced?
Service timing depends on the engine manufacturer's maintenance schedule, operating hours, and water conditions. Inspect the impeller and pump components at the intervals specified in your Yamaha service documentation, and service sooner if the engine operates in sandy, silty, or salt water.
Safety & Important Information
- Confirm the complete engine model, year, shaft configuration, serial range, and OEM reference before ordering.
- Do not assume fitment for F9.9, F13.5, or other Yamaha models based only on horsepower or general F-series naming.
- Compare the original pump assembly and package contents before installation.
- Use the correct torque values and service procedures for your exact outboard.
- Professional installation is recommended if you are not experienced with lower-unit or water-pump service.
- This is an aftermarket replacement and is not manufactured or endorsed by Yamaha.
About Sea Sierra
- Marine replacement parts selected for practical service and repair applications.
- Clear component listings and cross-reference information to support fitment checks.
- Aftermarket value for routine outboard maintenance and water-pump service.
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