Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Outboards (Replaces 6BX-WG078-00, 6EE-W0078-00, 6EE-W0078-01)
Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Outboards (Replaces 6BX-WG078-00, 6EE-W0078-00, 6EE-W0078-01) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Out...
Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Outboards (Replaces 6BX-WG078-00, 6EE-W0078-00, 6EE-W0078-01) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit provides all necessary components to restore the cooling system on Yamaha 4HP, 5HP, and 6HP four-stroke outboards, specifically covering F4B, F5A, and F6C models from 2009–2023. It ensures your engine maintains optimal temperature and performance.
This kit is a direct interchange for Yamaha part numbers 6BX-WG078-00, 6BX-WG0078-00, 6EE-W0078-00, 6EE-W0078-01, and Sierra 18-3473.
- Engineered as a direct OEM-spec replacement for straightforward installation.
- Includes all essential seals, gaskets, and hardware for a complete overhaul.
- Backed by a one-year aftermarket warranty for peace of mind.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6BX-WG078-00 |
| Yamaha | 6BX-WG0078-00 |
| Yamaha | 6EE-W0078-00 |
| Yamaha | 6EE-W0078-01 |
| Sierra | 18-3473 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
The following table lists compatible Yamaha four-stroke models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F4BMH | 4 | 4-Stroke | 2010+ | 6BX-WG078-00 | |
| Yamaha | F4LMH | 4 | 4-Stroke | 2009–2014 | 6BX-WG078-00 | |
| Yamaha | F4SMHA | 4 | 4-Stroke | 2009–2014 | 6BX-WG078-00 | |
| Yamaha | F5AMH | 5 | 4-Stroke | 2010+ | 6BX-WG078-00 | |
| Yamaha | F5LMH | 5 | 4-Stroke | 2010+ | 6BX-WG078-00 | |
| Yamaha | F5SMH | 5 | 4-Stroke | 2010+ | 6BX-WG078-00 | |
| Yamaha | F6CMH | 6 | 4-Stroke | 2010+ | 6BX-WG078-00 | |
| Yamaha | F6LMHA | 6 | 4-Stroke | 2009–2014 | 6BX-WG078-00 | |
| Yamaha | F6SMHA | 6 | 4-Stroke | 2009–2014 | 6BX-WG078-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Warranty
- 1 Year (YAHATSU aftermarket)
- Compatible Engines
- Yamaha 4-Stroke 4-6HP outboard engines
What’s in the Box
- 1 x Impeller (6E0-44352-00)
- 1 x Housing, Water Pump (6EE-G4311-00)
- 1 x Gasket, Water Pump (6EE-G4315-00)
- 1 x Cup, Insert (6EE-G4322-00)
- 1 x Plate, Wear (6EE-G4323-00)
- 1 x Damper, Water Seal (6EE-G4366-00)
- 2 x Pin, Dowel (93604-18080)
- 4 x Bolt (97080-06045)
Installation Notes
- Lower the outboard's gearcase to access the water pump assembly.
- Remove the bolts securing the water pump housing and lift it off the driveshaft.
- Take note of the old impeller's vane direction before removing it, along with the wear plate and gaskets.
- Clean the housing and mounting surfaces, removing any old gasket material or debris.
- Install the new wear plate and gaskets.
- Slide the new impeller onto the driveshaft while turning the shaft clockwise to bed the vanes correctly.
- Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
- Reassemble the lower unit, start the engine in water, and confirm a steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my Yamaha engine?
This kit is for Yamaha F4B, F5A, and F6C four-stroke models (4HP, 5HP, 6HP) from 2009–2023. To ensure a perfect match, please compare your engine model against our compatibility table and cross-reference your old part number with the equivalents listed, such as 6BX-WG078-00 or 6EE-W0078-00.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or no water stream from the "tell-tale" outlet, engine overheating alarms, or steam from the exhaust. Upon inspection, a worn impeller will appear cracked, brittle, have broken vanes, or be permanently deformed.
How often should I replace the impeller?
For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 hours of operation, whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent changes.
Is there a trick to installing the new impeller?
Yes. When you slide the new impeller down the driveshaft into the insert cup, you must turn the driveshaft clockwise. This flexes the impeller vanes in the correct direction for pumping action when the engine runs.
Why choose an aftermarket kit over OEM?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility. Our parts are batch-inspected for consistency, offering reliable performance at a better value.
How fast do you ship?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options are available at checkout where applicable.
What is the warranty and return policy?
This kit is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended for safety, proper function, and engine longevity.
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, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By working directly with factories, we offer fair pricing without compromising on materials or quality control.
Payment & Security
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