Water Pump Service Kit Without Housing – Fits Yamaha 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02
Water Pump Service Kit Without Housing – Fits Yamaha 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
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Water Pump Service Kit Without Housing – Fits Yamaha 2-Stroke 60–70...
Water Pump Service Kit Without Housing – Fits Yamaha 2-Stroke 60–70 HP and 4-Stroke F50/T50/T60 – OEM 6H3-W0078-02 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Service Kit Without Housing is designed for selected Yamaha outboards using OEM water pump reference 6H3-W0078-02. It supplies the principal service components needed to renew the water pump assembly while reusing the existing water pump housing. The kit does not include a new outer water pump housing.
The kit is applicable to the Yamaha 2-stroke and 4-stroke model groups listed below. Because Yamaha fitment can vary by model code and production year, confirm the engine model, stroke type, year, and existing part number before ordering.
- Service kit for the lower-unit water pump assembly.
- Includes the impeller, drive key, pump cup, wear plate, gaskets, O-ring, and mounting bolts listed below.
- Designed for service installation with the original compatible water pump housing.
- Aftermarket replacement for the Yamaha OEM reference shown in the part-number table.
Part Number Reference
| Brand | Part Number | Application |
|---|---|---|
| Yamaha | 6H3-W0078-02 | Water pump service kit reference |
| Yamaha | 6H3-44352-00 | Impeller component reference |
Engine & Model Compatibility
Compatibility is limited to the model groups and year ranges recorded for this service kit. Keep the model, year, horsepower, and stroke conditions together when checking fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Reference |
|---|---|---|---|---|---|
| Yamaha | 60, C60, P60, 70, C70 | 60–70 HP | 2-Stroke | 1997–2003 | 6H3-W0078-02 |
| Yamaha | C60, E60, P60, 70 | 60–70 HP | 2-Stroke | 1992–1996 | 6H3-W0078-02 |
| Yamaha | F50, T50 | 50 HP | 4-Stroke | 1996 | 6H3-W0078-02 |
| Yamaha | T50, T60 | 50–60 HP | 4-Stroke | 1997–2023 | 6H3-W0078-02 |
Technical Specifications
- Product Type
- Water pump service kit without outer housing
- Installation Location
- Lower unit / gearcase water pump assembly
- Impeller Material
- Replacement water pump impeller
- Housing Included
- No. Reuse the existing compatible water pump housing.
- OEM Reference
- 6H3-W0078-02
What’s in the Box
The service-kit component list includes the following items:
- 1 x Water pump impeller — 6H3-44352-00
- 1 x Woodruff key — 90280-02M03
- 1 x Pump cup / cartridge insert — 663-44322-00
- 1 x Wear plate — 6H3-44323-00
- 1 x Wear-plate gasket — 6H3-44324-00
- 1 x Water pump gasket — 6H3-44315-A0
- 1 x Water pump gasket — 688-44316-A0
- 1 x O-ring — 93210-46044-00
- 2 x Bolt with washer — 90119-08M14-00
- 2 x Bolt with washer — 90119-08M33-00
Not included: the outer water pump housing. Inspect the original housing for scoring, distortion, cracking, or excessive wear and replace it separately if necessary.
Installation Notes
- Confirm the engine model, year, stroke, and existing water pump reference before beginning work.
- Disconnect the battery where applicable and place the outboard in neutral.
- Remove the lower unit according to the engine service manual.
- Remove the water pump cover or housing and take out the old impeller, key, cup, wear plate, gaskets, and O-ring.
- Inspect the reusable outer housing and clean all mating surfaces thoroughly. Do not reuse damaged or excessively worn parts.
- Install the Woodruff key on the driveshaft, then fit the impeller in the correct direction of rotation.
- Install the pump cup, wear plate, gaskets, O-ring, and bolts in the correct order according to the service manual.
- Reinstall the lower unit, ensuring correct alignment of the driveshaft and water tube.
- Tighten fasteners to the torque specifications in the applicable Yamaha service manual.
- Run the engine only in water or with an appropriate flushing device, then verify a steady cooling-water tell-tale stream.
Troubleshooting & FAQ
How do I confirm that this kit fits my Yamaha outboard?
Check the complete engine model code, production year, horsepower, stroke type, and existing water pump reference against the compatibility table. This listing covers only the Yamaha 2-stroke and 4-stroke model groups and year ranges shown above. If your model is outside those conditions, do not assume compatibility from horsepower alone.
Does this kit include the water pump housing?
No. This is a water pump service kit without the outer housing. It is intended for installations where the original compatible housing can be safely reused.
What are the signs of a worn water pump impeller?
Common signs include overheating, a weak or interrupted tell-tale stream, reduced cooling-water flow, brittle or cracked impeller vanes, and visible wear or scoring in the pump components.
How often should the water pump impeller be inspected?
Inspect the water pump during scheduled maintenance and whenever the engine shows reduced cooling-water flow or overheating symptoms. Replacement timing depends on operating hours, storage conditions, and exposure to saltwater, sand, or silt.
Is this an OEM Yamaha part?
No. This listing is for an aftermarket replacement service kit that references Yamaha OEM part number 6H3-W0078-02 for identification and fitment checking.
Safety & Important Information
- Verify the complete engine model, year, stroke, and OEM reference before purchase.
- Verify that the existing water pump housing is compatible and suitable for reuse; this kit does not include a housing.
- Follow the applicable service manual for disassembly, assembly, sealant requirements, and torque specifications.
- Do not run the outboard without an adequate water supply.
- Professional installation is recommended if you are not experienced with lower-unit water pump service.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Product information is organized around engine model, year, horsepower, stroke, and reference number.
- Service Support — Check the compatibility details and installation requirements before ordering.
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