Water Pump Repair Kit with Housing – Fits Yamaha 4HP/5HP 2-Stroke and F4 4-Stroke Outboards
Water Pump Repair Kit with Housing – Fits Yamaha 4HP/5HP 2-Stroke and F4 4-Stroke Outboards 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 4HP/5HP 2-Stroke a...
Water Pump Repair Kit with Housing – Fits Yamaha 4HP/5HP 2-Stroke and F4 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This water pump repair kit with housing is intended for servicing the cooling-water pump on selected Yamaha outboard motors. It is listed for Yamaha 4HP and 5HP 2-stroke applications from 1982–2023 and Yamaha F4 4-stroke applications from 1982–2008.
The kit is identified as a water pump service or repair kit with a pump housing. It is supplied for water pump maintenance and replacement and should be matched to the exact engine model, year, stroke, and applicable part number before ordering.
- Water pump repair kit supplied with a water pump housing.
- Designed for water pump service on selected Yamaha 4HP and 5HP outboards.
- Also listed for selected Yamaha F4 4-stroke outboards.
- Use the part-number and compatibility information below to confirm fitment.
Part Number Matrix
The following Yamaha references are associated with this water pump repair kit. Part-number association does not replace checking the complete engine application.
| Brand | Part Number | Reference Type |
|---|---|---|
| Yamaha | 6E0-W0078-00-00 | Listed replacement reference |
| Yamaha | 6E0-W0078-01-00 | Listed replacement reference |
| Yamaha | 6E0-W0078-02-00 | Water pump repair-kit reference |
| Yamaha | 6E0-W0078-A2-00 | Water pump repair-kit reference |
| Yamaha | 68D-WG078-00-00 | Listed F4 4-stroke repair-kit reference |
Engine and Model Compatibility
Fitment depends on the complete engine configuration. Confirm the model designation, production year, horsepower, stroke, and existing water pump part number before purchase. The company fitment information lists the following application ranges:
| Brand | Application | Rated HP | Stroke | Listed Years | Related Part Numbers | Fitment Notes |
|---|---|---|---|---|---|---|
| Yamaha | Selected 4HP and 5HP outboards | 4, 5 | 2-Stroke | 1982–1996 | 6E0-W0078-00-00 6E0-W0078-01-00 6E0-W0078-02-00 6E0-W0078-A2-00 |
Confirm the exact engine model before ordering. |
| Yamaha | Selected 4HP and 5HP outboards | 4, 5 | 2-Stroke | 1997–2023 | 6E0-W0078-00-00 6E0-W0078-01-00 6E0-W0078-02-00 6E0-W0078-A2-00 |
Later-year fitment remains model-specific; verify the engine identification label. |
| Yamaha | F4 outboards | 4 | 4-Stroke | 1982–2008 | 68D-WG078-00-00 6E0-W0078-00-00 6E0-W0078-01-00 6E0-W0078-02-00 |
Verify the exact F4 model and water pump reference. |
Catalog-listed examples
Parts-catalog occurrences associate the 6E0-W0078 repair-kit references with selected Yamaha 4HP and 5HP 2-stroke models, including 4LK, 4LN, 4SK, 4SN, 5LK, 5LN, 5SK, and 5SN applications in the catalog records reviewed. The 6E0-W0078-A2-00 and 6E0-W0078-A3-00 references also appear with selected 1996–2002 4HP and 5HP 2-stroke models. The 68D-WG078-00-00 reference appears with selected Yamaha F4 4-stroke models from 2002–2009 in the catalog records reviewed. These examples are not an exhaustive fitment list and do not override the company-listed application ranges.
Technical Specifications
- Product Type
- Water pump repair kit with housing
- Application
- Selected Yamaha 4HP and 5HP 2-stroke outboards and Yamaha F4 4-stroke outboards
- Installation
- Water pump service or replacement installation
- Fitment Verification
- Match the engine model, year, horsepower, stroke, and water pump part number before installation
What's in the Box
- 1 x Water pump repair kit with housing
- Service components intended for the listed water pump application
Component details and hardware configuration can vary by application. Compare the supplied parts with the original water pump assembly before beginning installation. Do not assume that a component listed for one engine application fits every engine in the horsepower range.
Installation Notes
- Confirm the engine model, year, horsepower, stroke, and existing water pump reference before starting work.
- Disconnect the battery or follow the engine manufacturer's required safety procedure, and place the outboard in a stable service position.
- Remove the lower unit according to the manufacturer's service instructions.
- Remove the existing water pump housing and related service components. Note the orientation of the impeller and the position of any key, pin, plate, gasket, or seal before removal.
- Clean the mating surfaces and inspect the driveshaft, keyway, water tube, and surrounding components for wear, corrosion, or damage.
- Compare the new housing and service components with the original parts before assembly.
- Install the repair-kit components in the correct order and orient the impeller vanes according to the manufacturer's procedure.
- Use only suitable lubricant or assembly products recommended for the water pump components. Do not run the impeller dry.
- Reinstall the lower unit and tighten fasteners to the manufacturer's specified torque and sequence.
- Test the outboard using an appropriate water supply or flush attachment. Confirm a steady cooling-water discharge and check for leaks before normal operation.
Troubleshooting and FAQ
How can I confirm this kit fits my motor?
Check the complete engine model and year, rated horsepower, stroke, and existing water pump part number. The 4HP, 5HP, and F4 application ranges are not universal across every model or production year.
What are common symptoms of a worn water pump?
A weak or missing tell-tale stream, overheating, an overheating warning, or reduced cooling performance can indicate a worn impeller or another water-pump or cooling-system problem. Stop operation and diagnose the cause before continued use.
Does this product include the water pump housing?
Yes. The company product description identifies this item as a water pump service or repair kit with housing.
Is this a complete lower-unit assembly?
No. This is a water pump repair kit with housing for servicing the water pump. It is not a complete lower unit or a complete gearcase assembly.
Can I install it without checking the original part?
No. Compare the original water pump assembly, part number, mounting arrangement, and engine identification before installation. Related part numbers can apply to different model, year, or stroke conditions.
How often should a water pump be serviced?
Service intervals depend on the engine manufacturer's maintenance schedule and operating conditions. Inspection or replacement may be needed sooner when the outboard is used in sandy, silty, salty, or debris-filled water.
Safety and Important Information
- Verify the exact engine model, year, horsepower, stroke, and part number before ordering.
- Do not treat a general horsepower match as confirmation of fitment.
- Inspect all supplied and reused components before assembly.
- Never operate an outboard without an adequate water supply to the cooling system.
- Follow the manufacturer's service procedures and torque specifications; professional installation is recommended when required.
About Sea Sierra
- Marine Replacement Parts — Practical service components for routine outboard maintenance and repair.
- Application-Focused Listings — Product references and fitment ranges are provided to help you compare your engine before ordering.
- Support for Maintenance Work — Review the engine identification and original component details whenever application-specific fitment is required.
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