Water Pump Repair Kit with Housing – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00)
Water Pump Repair Kit with Housing – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit with Housing – Fits Yamaha F15C/F20 4-Stroke ...
Water Pump Repair Kit with Housing – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00) 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 outboard engines. It provides the major components needed to service the water pump assembly, including a replacement housing, impeller, plates, seals or gaskets, and service hardware.
The kit is intended to restore proper water-pump function and cooling-water circulation during routine maintenance or repair. It is a replacement part, not a genuine Yamaha component.
Part Number Matrix
Use the references below together with your engine model and original water-pump assembly to confirm compatibility before ordering.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 6AH-W0078-00-00 | OEM water pump repair kit reference |
| Yamaha | 6AH-W0078-01-00 | OEM water pump repair kit reference |
| Yamaha | 6AH-W0078-02-00 | OEM water pump repair kit reference |
| Sierra | 18-3479 | Aftermarket cross-reference; verify the housing and component configuration before purchase |
Engine & Model Compatibility
The company catalog identifies this housing-equipped service kit for Yamaha F15C and F20 four-stroke outboards. Engine model suffix, year, shaft length, and serial-number conditions can affect water-pump fitment, so compare the original part and engine identification label before installation.
| Brand | Model Family | Rated HP | Stroke | Housing Included | OEM References |
|---|---|---|---|---|---|
| Yamaha | F15C | 15 HP | 4-Stroke | Yes | 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00 |
| Yamaha | F20 | 20 HP | 4-Stroke | Yes | 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00 |
Technical Specs
- Product Type
- Water pump repair kit with housing
- Application
- Yamaha F15C and F20 four-stroke outboard engines
- Installation
- Replacement water-pump service installation
- Product Status
- Aftermarket replacement; not genuine Yamaha OEM
What's in the Box
- Water pump housing
- Water pump impeller
- Water pump plates or wear plates
- Seals and gaskets required for the listed kit configuration
- Related water-pump service hardware
Component appearance and exact hardware configuration may vary by production batch. Compare the kit contents with your original assembly before installation.
Installation Notes
- Disconnect the battery and secure the outboard according to the manufacturer's service instructions.
- Remove the lower unit and keep track of fasteners, water-tube alignment, and shift-linkage position.
- Remove the existing water-pump housing, impeller, plates, seals, and related service parts.
- Clean the mating surfaces and inspect the driveshaft, keyway, water tube, and housing seat for damage or corrosion.
- Install the replacement impeller with the drive key correctly seated and fit the supplied plates, seals, gaskets, and housing.
- Follow the engine manufacturer's torque sequence and specifications when tightening the water-pump fasteners.
- Reinstall the lower unit, confirming correct driveshaft and water-tube engagement.
- Test the engine in a safe water environment and confirm a strong, steady telltale stream before normal operation.
Lower-unit removal and water-pump service require mechanical knowledge. If you are not familiar with outboard service procedures, use a qualified marine technician.
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 model and compare the existing water-pump assembly with the product images and kit configuration. The OEM references 6AH-W0078-00-00, 6AH-W0078-01-00, and 6AH-W0078-02-00 are useful identification references, but model suffix, shaft configuration, and serial-number conditions should also be checked.
Does this version include the water-pump housing?
Yes. The company product record identifies this as a water pump service kit with housing. The package is different from impeller-only or service-kit versions without a housing.
What are common signs of a worn water pump?
Possible signs include overheating, a weak or missing telltale stream, reduced cooling-water flow, or a cracked, brittle, or visibly worn impeller. Inspect the housing and plates as well as the impeller because damage in one part can affect the complete assembly.
Should I replace only the impeller?
If the housing, plates, seals, and related surfaces are in good condition, some repairs may require only an impeller service. This listing is the housing-equipped repair-kit configuration for a broader water-pump service.
Is this a genuine Yamaha part?
No. This is an aftermarket replacement kit designed for the listed Yamaha applications and OEM reference numbers.
Can I use the part number alone to confirm fitment?
No. Part-number references should be used with the complete engine model, horsepower, stroke, shaft configuration, and serial-number information where applicable. Compare the original housing and impeller before ordering.
Safety & Important Information
- Verify the complete engine model and original water-pump configuration before purchase.
- Do not operate the outboard without an adequate cooling-water supply.
- Use manufacturer torque specifications and appropriate marine-service procedures.
- Stop operation immediately if the engine overheats or the telltale stream is weak or absent.
- This is an aftermarket replacement, not an OEM Yamaha component.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Product information is organized around engine model families and verified reference numbers.
- Service-Ready Solutions — Kits are configured to support common water-pump service requirements.
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