Water Pump Repair Kit for Yamaha F225, F250 and F300 4.2L V6 Outboards – Cross-References 6CE-W0078-01-00 and 6CE-W0078-02-00
Water Pump Repair Kit for Yamaha F225, F250 and F300 4.2L V6 Outboards – Cross-References 6CE-W0078-01-00 and 6CE-W0078-02-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit for Yamaha F225, F250 and F300 4.2L V6 Outboa...
Water Pump Repair Kit for Yamaha F225, F250 and F300 4.2L V6 Outboards – Cross-References 6CE-W0078-01-00 and 6CE-W0078-02-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Repair Kit is designed for selected Yamaha 4-stroke 4.2L V6 outboards in the F225, F250 and F300 families. It services the lower-unit water pump assembly and helps restore dependable cooling-water circulation when the impeller and related wear components require replacement.
The product is associated with Yamaha water pump repair-kit references 6CE-W0078-01-00 and 6CE-W0078-02-00. These references appear across different Yamaha model years and catalog revisions, so always match the exact model, year and serial-number range before ordering.
- Product type: Aftermarket water pump repair kit
- Application: Lower-unit water pump assembly
- Installation: Replacement service part; professional installation is recommended
- Brand status: Aftermarket replacement, not a Yamaha-branded OEM component
Part Number References
Use these references as cross-checking aids only. Part-number appearance in a catalog does not replace confirmation of the complete engine model and year.
| Brand | Reference | Use |
|---|---|---|
| Yamaha | 6CE-W0078-01-00 | Water pump repair-kit reference used on selected earlier 4.2L V6 applications |
| Yamaha | 6CE-W0078-02-00 | Water pump repair-kit reference used on selected later applications |
| Sierra | 18-3470 | Aftermarket water pump repair-kit reference |
| Sierra | 18-3471 | Aftermarket water pump repair-kit reference |
Engine Compatibility
The following Yamaha 4-stroke models are represented in the available catalog cross-references. Confirm the exact model designation, year and serial-number range against the engine identification label and service documentation before purchase.
| Models | Rated HP | Stroke | Catalog years shown |
|---|---|---|---|
| F225F, F225B, F225NCA, F225XB, F225XCA, LF225XB, LF225XCA | 225 | 4-Stroke | 2009 and later applications; specific model-year coverage varies |
| F250D, F250NCA, F250UCA, F250XB, F250XCA, LF250UCA, LF250XB, LF250XCA, VF250XA | 250 | 4-Stroke | 2011 and later applications; some listed configurations are 2014–2016 or 2015–2016 |
| F300B, F300BETU, F300BETX, F300NCA, F300UCA, F300XCA, F300C, FL300BETU, FL300BETX, LF300UCA, LF300XCA | 300 | 4-Stroke | 2011 and later applications; specific model-year coverage varies |
Important: Do not assume that every Yamaha 4.2L V6 outboard uses the same water-pump service parts. Differences may exist by model, year, lower-unit configuration and serial-number range.
Technical Specifications
- Product Type
- Water pump repair kit
- Application
- Yamaha 4-stroke 4.2L V6 outboards, selected F225/F250/F300 applications
- Installation Location
- Lower-unit water pump assembly
- Replacement Type
- Aftermarket service replacement
- OEM References
- 6CE-W0078-01-00 and 6CE-W0078-02-00
What's Included
The listed service components are intended for servicing the water-pump assembly. Component appearance and exact contents may vary by production batch, so compare the supplied parts with the original assembly before installation.
- 1 × Water pump impeller, reference 6CE-44352-00-00
- 1 × Impeller key, reference 90280-04M05-00
- 1 × O-ring, reference 93210-94003-00
- 4 × Bolts, reference 97095-08045-00
- 2 × Oil seals, reference 93104-22M07-00
- 1 × Cartridge insert, reference 6AW-44322-00-00
This listing does not represent a complete lower-unit replacement and does not include the engine, gearcase or any component not listed above. The existing water-pump housing must be serviceable unless a separate housing is specifically supplied.
Installation Notes
- Disconnect the battery and secure the outboard according to the manufacturer's service procedure.
- Place a suitable drain pan beneath the lower unit. If the lower unit is removed, follow the manufacturer's procedure for draining and refilling gear lubricant.
- Remove the lower-unit mounting hardware and carefully separate the gearcase from the upper casing.
- Remove the water-pump cover or housing and note the orientation of the impeller, key, seals and other components.
- Clean the mating surfaces and inspect the pump housing, wear surfaces, driveshaft and water-tube connection. Replace damaged components before reassembly.
- Install the new impeller with the key correctly seated and assemble the supplied service parts in the same orientation as the original components.
- Use a suitable marine lubricant where specified by the service manual. Do not lubricate components where the manufacturer prohibits it.
- Reinstall the water-pump housing and tighten fasteners to the manufacturer's specified torque.
- Reinstall and secure the lower unit, then refill the gearcase with the correct marine gear lubricant if it was drained.
- Run the engine only with an appropriate water supply and verify a strong, consistent tell-tale stream and normal operating temperature.
Always use the service manual for the exact engine model and follow all torque, sealing and lubrication specifications. Improper water-pump installation can cause overheating and severe engine damage.
Troubleshooting & FAQ
What are common signs of a worn water-pump impeller?
Possible signs include overheating, reduced or intermittent tell-tale flow, an alarm at idle or low speed, or an impeller that is cracked, brittle, deformed or missing vanes during inspection.
Does this kit include the complete water-pump housing?
No. This listing is for the service components listed in the box contents. The existing housing and related lower-unit components must be inspected and reused if they are undamaged, or replaced separately if worn.
Does this fit every Yamaha 4.2L V6 outboard?
No. The compatibility information covers selected F225, F250 and F300 4-stroke applications. Confirm the exact model, year and serial-number range before ordering.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement kit intended to cross-reference the listed Yamaha and Sierra service-part references. It is not manufactured or branded by Yamaha.
How often should the impeller be replaced?
Replacement intervals depend on the manufacturer's service schedule, operating hours and conditions such as saltwater use, sand or silt exposure and periods of storage. Inspect the impeller regularly and replace it when the service manual specifies or whenever wear is found.
What should I verify before ordering?
Compare the engine model designation, horsepower, stroke, year, serial-number range, original part number and the existing pump components. If any of these details do not match, consult a qualified marine technician before purchasing.
Safety & Important Information
- Disconnect the battery before servicing the lower unit.
- Never run an outboard without an adequate water supply.
- Use the correct torque values, lubricants and sealants from the applicable service manual.
- Inspect the pump housing and related wear surfaces before installing new components.
- Professional installation is recommended, especially when lower-unit removal or gearcase service is required.
About Sea Sierra
- Marine replacement parts — Practical aftermarket service components for routine maintenance and repair.
- Application-focused listings — Compatibility references are provided to help customers compare model and part-number information.
- Service support — Verify the exact engine configuration before installation for safe and reliable operation.
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