Water Pump Repair Kit Without Housing – For Yamaha F225, F250 and F300 V6 4-Stroke Outboards
Water Pump Repair Kit Without Housing – For Yamaha F225, F250 and F300 V6 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing – For Yamaha F225, F250 and F...
Water Pump Repair Kit Without Housing – For Yamaha F225, F250 and F300 V6 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit Without Housing is designed to service the lower-unit water pump on selected Yamaha F225, F250 and F300 V6 four-stroke outboards. It is supplied as a repair kit for the pump internals and does not include the water-pump housing.
The kit corresponds to Yamaha water-pump repair-kit references 6CE-W0078-00-00, 6CE-W0078-01-00 and 6CE-W0078-02-00 in the catalog records reviewed. These references cover different model years and should not be treated as interchangeable for every engine without confirming the exact model and year.
- Repair-kit configuration without a water-pump housing.
- Includes the impeller, key, seals, o-rings and related pump-service components listed below.
- Suitable for servicing the lower-unit water-pump assembly when the existing housing is reusable.
- Aftermarket replacement; not a genuine Yamaha-branded component.
Part Number Matrix
These are manufacturer and aftermarket reference numbers associated with this repair-kit application. Confirm the complete engine model and production year before ordering.
| Brand | Part Number | Reference Type | Notes |
|---|---|---|---|
| Yamaha | 6CE-W0078-00-00 | OEM reference | Used in earlier catalog applications. |
| Yamaha | 6CE-W0078-01-00 | OEM reference | Used in selected 2014-era applications. |
| Yamaha | 6CE-W0078-02-00 | OEM reference | Used in selected later applications, including catalog records from 2021. |
| Sierra | 18-3470 | Aftermarket catalog reference | Water pump repair kit without housing. |
| Sierra | 18-3471 | Aftermarket catalog reference | Different configuration identified as a kit with housing; not the same package configuration as this listing. |
Engine & Model Compatibility
Fitment depends on the exact Yamaha model, year and component configuration. The catalog data reviewed identifies this repair-kit family for selected F225, F250 and F300 V6 four-stroke applications, including the examples below.
| Brand | Model examples | Rated HP | Stroke | Documented application examples | Reference |
|---|---|---|---|---|---|
| Yamaha | F225XCA, LF225XCA | 225 | 4-Stroke | 2011–2012 catalog records; selected 2014 and 2021 records also appear for related F225 variants. | 6CE-W0078-00-00 / -01-00 / -02-00 |
| Yamaha | F250UCA, F250XCA, LF250UCA, LF250XCA | 250 | 4-Stroke | 2011–2012 catalog records; selected 2014 and later records appear for related F250 variants. | 6CE-W0078-00-00 / -01-00 / -02-00 |
| Yamaha | F300UCA, F300XCA, LF300UCA, LF300XCA | 300 | 4-Stroke | 2011–2012 catalog records; selected 2014 records appear for related F300 variants. | 6CE-W0078-00-00 / -01-00 |
| Yamaha | F225NCA, F225XCA, F225NCB, F225XB | 225 | 4-Stroke | Selected 2014 and 2021 catalog records. | 6CE-W0078-01-00 / -02-00 |
| Yamaha | F250NCA | 250 | 4-Stroke | Selected 2014 and 2021 catalog records. | 6CE-W0078-01-00 / -02-00 |
Important: The examples above are not a substitute for model-year verification. The same horsepower may use different pump components across model variants and production years. Verify the original OEM reference, engine model and serial-number range before installation.
Technical Specs
- Product Type
- Water pump repair kit without housing
- Application
- Selected Yamaha V6 four-stroke outboard lower-unit water pumps
- Installation
- Replacement service part; professional installation is recommended
- Housing Included
- No
- Brand Status
- Aftermarket replacement, not genuine Yamaha OEM
What's in the Box
- 1 x Water pump impeller — Yamaha reference 6CE-44352-00-00
- 1 x Impeller key — Yamaha reference 90280-04M05-00
- 1 x Outer O-ring — Yamaha reference 93210-94003-00
- 1 x O-ring — Yamaha reference 93210-37M67-00
- 4 x Water-pump bolts — Yamaha reference 97095-08045-00
- 2 x Oil seals — Yamaha reference 93104-22M07-00
- 1 x Cartridge insert — Yamaha reference 6AW-44322-00-00
- 1 x Water-pump gasket — Yamaha reference 6CE-44315-00-00
- 1 x Wear plate — Yamaha reference 6CE-44323-01-00
- 4 x Bolt washers
- 2 x Dowel pins
Package contents are for the repair-kit configuration without housing. The water-pump housing is not included.
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Support the outboard securely and remove the lower unit according to the engine manufacturer's service procedure.
- Locate the water-pump assembly on top of the gearcase and remove the retaining hardware.
- Lift off the existing pump components and note the orientation of the impeller, key, seals and gaskets.
- Clean and inspect the reusable housing, base and mating surfaces. Replace the housing or other damaged components if they are scored, warped or corroded.
- Install the supplied seals, o-rings, gasket, wear plate, insert and key in the correct positions.
- Install the new impeller while rotating the driveshaft in the direction specified by the engine service manual so the vanes seat correctly.
- Reinstall the reusable water-pump housing and tighten the fasteners to the manufacturer's torque specification.
- Reinstall the lower unit, ensuring correct alignment of the water tube, driveshaft and shift shaft.
- Refill the gearcase lubricant if it was drained during service and install the drain screw with the required gasket.
- Run the engine in water or with the correct flushing equipment and verify a strong tell-tale stream and normal operating temperature.
Troubleshooting & FAQ
Does this kit include the water-pump housing?
No. This is the repair-kit configuration without housing. Reuse the existing housing only if it passes inspection and is free from scoring, distortion and excessive corrosion.
Which Yamaha part numbers are associated with this kit?
Catalog records associate this repair-kit family with 6CE-W0078-00-00, 6CE-W0078-01-00 and 6CE-W0078-02-00. The correct reference depends on the engine model and production year.
Is this the same as Sierra 18-3471?
No. The reviewed Sierra catalog identifies 18-3471 as a water-pump repair-kit configuration with housing, while 18-3470 is identified as the configuration without housing. Package contents and application should be checked before substituting between them.
Will this fit every Yamaha F225, F250 or F300?
No. These horsepower families include multiple model variants and production years. Confirm the exact model designation, year, serial-number range and OEM reference before ordering.
What are common signs of a failing water-pump impeller?
A weak or missing tell-tale stream, an overheating alarm, steam from the exhaust or a damaged, brittle or deformed impeller can indicate a cooling-system problem. Stop operation if the engine overheats and inspect the cooling system.
How often should the impeller be replaced?
Replacement intervals depend on the engine manufacturer's schedule and operating conditions. Saltwater, sand, silt and extended storage can increase wear. Follow the service schedule for your exact engine and inspect the pump whenever the lower unit is serviced.
Is this a genuine Yamaha OEM part?
No. This listing is for an aftermarket replacement repair kit. Yamaha reference numbers are provided only to identify the application and cross-reference the component.
Safety & Important Information
- Confirm the exact engine model, year and serial-number range before ordering.
- Do not rely on horsepower alone to determine fitment.
- Compare the old components and pump configuration with the listed contents before installation.
- Use the engine manufacturer's service manual for disassembly, torque values, seal installation and final testing.
- This is an aftermarket replacement and is not supplied with a water-pump housing.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine marine service and repair.
- Application-Focused Listings — Product references and fitment information are provided to help confirm the correct replacement.
- Service Support — Verify the exact model and component configuration before installation or ordering.
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