Water Pump Repair Kit Without Housing for Yamaha 4-Stroke F225, F250 and F300 4.2L V6 Outboards – Replaces 6CE-W0078-00, Sierra 18-3470
Water Pump Repair Kit Without Housing for Yamaha 4-Stroke F225, F250 and F300 4.2L V6 Outboards – Replaces 6CE-W0078-00, Sierra 18-3470 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Repair Kit Without Housing for Yamaha 4-Stroke F225, F25...
Water Pump Repair Kit Without Housing for Yamaha 4-Stroke F225, F250 and F300 4.2L V6 Outboards – Replaces 6CE-W0078-00, Sierra 18-3470 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit is specified for Yamaha 4-stroke F225, F250 and F300 4.2L V6 outboards. It is supplied as a service kit without the water pump housing and is intended to help restore the water pump and engine-cooling system during routine service or repair.
The kit is identified by Yamaha OEM reference 6CE-W0078-00 and aftermarket reference Sierra 18-3470. Confirm the model designation and existing water pump assembly before ordering.
- Aftermarket replacement water pump service kit.
- Designed for the specified Yamaha F225, F250 and F300 4-stroke 4.2L V6 applications.
- Water pump housing is not included.
- Helps renew worn water-pump service components and support proper cooling-system operation.
Part Number References
| Brand | Reference | Application | Notes |
|---|---|---|---|
| Yamaha | 6CE-W0078-00 | Water pump repair kit | OEM reference |
| Sierra | 18-3470 | Water pump repair kit | Aftermarket reference |
Engine Compatibility
Use the following application range as a guide. Model suffixes, production details and lower-unit configurations can affect fitment, so compare the original part and engine identification before installation.
| Brand | Model Family | Rated HP | Stroke | Engine Configuration | Reference |
|---|---|---|---|---|---|
| Yamaha | F225 | 225 HP | 4-Stroke | 4.2L V6 | 6CE-W0078-00 |
| Yamaha | F250 | 250 HP | 4-Stroke | 4.2L V6 | 6CE-W0078-00 |
| Yamaha | F300 | 300 HP | 4-Stroke | 4.2L V6 | 6CE-W0078-00 |
Technical Specifications
- Product Type
- Water pump repair kit
- Application
- Yamaha 4-stroke F225, F250 and F300 4.2L V6 outboards
- Installation
- Replacement service part; professional installation is recommended
- Water Pump Housing
- Not included
- OEM Reference
- 6CE-W0078-00
- Aftermarket Reference
- Sierra 18-3470
What’s in the Box
- Water pump repair-kit components for the specified application
- Water pump housing not included
Individual component quantities and exact component configuration may vary by production batch. Compare the supplied parts with the original assembly before installation.
Installation Notes
- Disconnect the battery cables, remove the engine cowling and follow the applicable Yamaha service procedure.
- Shift the outboard into neutral and remove the lower unit according to the service manual.
- Place the gearcase on a stable work surface and remove the water pump components that are being serviced.
- Clean the mating surfaces and inspect the water pump housing, wear surfaces, driveshaft and water tube for corrosion, scoring or damage.
- Install the applicable components from the repair kit in the correct orientation. Do not install a damaged or worn housing; the housing is not supplied with this kit.
- Lubricate and position the impeller as specified by the service manual, then reinstall the water pump components.
- Reattach the lower unit, ensuring correct alignment of the driveshaft, shift shaft and water tube. Tighten fasteners to the manufacturer’s specifications.
- Run the engine with an appropriate water supply and verify a steady cooling-water tell-tale stream before returning the outboard to service.
Troubleshooting & FAQ
Which Yamaha outboards does this kit fit?
The company application for this product is Yamaha 4-stroke F225, F250 and F300 4.2L V6 outboards. Check the complete model designation and compare your original water-pump parts before ordering.
Does the kit include the water pump housing?
No. This is a water pump repair kit supplied without the water pump housing. Reuse the original housing only if it meets the manufacturer’s inspection requirements.
What are common signs of a worn water pump?
Possible symptoms include overheating, a weak or intermittent tell-tale stream, reduced cooling-water flow and visible impeller wear. Stop operation if the engine overheats and inspect the cooling system before further use.
How often should the water pump be serviced?
Inspect and service the water pump according to the engine manufacturer’s maintenance schedule and operating conditions. Saltwater, silt and extended storage can increase service needs.
Is this an OEM Yamaha part?
No. This listing is for an aftermarket replacement kit. Yamaha and Sierra references are provided for identification and application comparison only.
Safety & Important Information
- Verify the complete engine model and the original part before purchase.
- Do not rely on horsepower alone to confirm fitment; model family, engine configuration and water-pump design must match.
- Inspect the original housing and related components because the housing is not included.
- Use the manufacturer’s service manual for torque values, installation direction and testing procedures.
- Professional installation is recommended to help prevent cooling-system failure or engine damage.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for routine maintenance and repair applications.
- Application-Focused Listings — Product references and compatibility information are provided to support accurate part selection.
- Service Support — Compare the original component and engine identification before installation, especially when model suffixes or configurations differ.
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