Water Pump Repair Kit – Fits Yamaha 4.2L V6 225-350HP (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00)
Water Pump Repair Kit – Fits Yamaha 4.2L V6 225-350HP (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Repair Kit – Fits Yamaha 4.2L V6 225-350HP (Replaces 6CE...
Water Pump Repair Kit – Fits Yamaha 4.2L V6 225-350HP (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit - Fits Yamaha 4.2L V6 225HP-300HP (Replaces 6CE-W0078-01-00, 6CE-W0078-02-00) is designed for Yamaha 4-Stroke 225HP, 250HP, 300HP, and 350HP (F225, F250, F300, F350) 4.2L V6 outboard engines from 2007–2015, also fitting the VF250 SHO (2015). It contains all necessary components to restore the engine's cooling system.
It serves as a direct replacement for Yamaha part numbers 6CE-W0078-01-00 and 6CE-W0078-02-00, as well as Sierra equivalents 18-3470 and 18-3471.
- Installs in the lower unit of the outboard motor.
- Includes all essential gaskets, seals, and the impeller.
- Engineered to meet or exceed original equipment specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6CE-W0078-01-00 | Superseded by 6CE-W0078-02-00 |
| Yamaha | 6CE-W0078-02-00 | Current OEM Part Number |
| Sierra | 18-3470 | Aftermarket equivalent |
| Sierra | 18-3471 | Aftermarket equivalent |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please verify your engine's model code (e.g., F225, LF250) and production year fall within the specified range for a guaranteed fit.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | F225 | 225 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F250 | 250 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL250 | 250 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF225 | 225 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF250 | 250 | 4-Stroke | 2010–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | VF250 | 250 | 4-Stroke | 2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F300 | 300 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL300 | 300 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF300 | 300 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | F350 | 350 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | FL350 | 350 | 4-Stroke | 2010 | 6CE-W0078-01-00/6CE-W0078-02-00 |
| Yamaha | LF350 | 350 | 4-Stroke | 2007–2015 | 6CE-W0078-01-00/6CE-W0078-02-00 |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Lower Unit
What’s in the Box
- 1 x Impeller (6CE-44352-00-00)
- 1 x Key/Woodruff Key (90280-04M05-00/90280-04002-00)
- 1 x O-Ring (93210-94003-00)
- 4 x Bolt (97095-08045-00/90119-08191-00)
- 2 x Seal, Oil (93104-22M07-00)
- 1 x Insert/Cartridge (6AW-44322-00-00)
- 1 x Outer Plate/Cartridge Plate (6CE-44323-01-00)
- 1 x Water Pump Gasket (6CE-44315-00-00)
- 2 x Dowel Pin (93606-12019-00)
- 1 x O-Ring (93210-37M67-00)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Drain the lower unit gearcase oil completely.
- Remove the bolts securing the lower unit (gearcase) and carefully separate it from the upper housing.
- Unbolt and remove the old water pump housing assembly from the driveshaft.
- Clean the driveshaft and mounting surfaces, removing any old gasket material or corrosion.
- Install the new woodruff key, impeller, gaskets, and seals from the kit as per the manufacturer's diagram. Ensure the impeller vanes are oriented correctly.
- Install the new housing, cartridge, and plate, tightening bolts to the specified torque.
- Re-install the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
- Refill the gearcase with fresh oil and test the engine using a water supply (flushing muffs) to verify proper cooling system operation.
Troubleshooting & FAQ
How do I know if this kit fits my specific Yamaha engine model?
Check your engine's model, rated horsepower, and year against our compatibility table. This kit is specifically for Yamaha 4.2L V6 models (e.g., F225, F300, LF350) made between 2007 and 2015. If your model and year are listed, the kit will fit.
What are the signs of a failing water pump?
Common symptoms include the engine running hotter than normal or overheating, a weak or intermittent water stream from the tell-tale indicator outlet, and a steam or vapor coming from the exhaust. An audible alarm or warning light on your console may also activate.
What's the difference between part numbers 6CE-W0078-01-00 and 6CE-W0078-02-00?
The part number 6CE-W0078-02-00 is a supersession, meaning it is the newer, updated version that replaces the older 6CE-W0078-01-00. They are functionally identical and fully interchangeable. This kit is designed to replace both versions.
How often should I replace my engine's water pump impeller?
For preventative maintenance, it is recommended to inspect the water pump and replace the impeller at least every two years or every 200 hours of operation, whichever comes first. In saltwater or sandy/silty conditions, yearly inspection and replacement is a safer interval.
My engine is still overheating after installing the new kit. What could be wrong?
First, confirm the impeller vanes were correctly oriented during installation (they should curve against the direction of driveshaft rotation). Second, ensure all gaskets and seals are seated properly to create a perfect seal, as air leaks will prevent the pump from priming. Lastly, check for any blockages in the cooling water intake or the tell-tale outlet.
Why is this an aftermarket part instead of an OEM part?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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