Water Pump Impeller Kit – Fits Yamaha F9.9/F13.5/F15/F20 Outboard Motors (Replaces 6AH-W0078-00-00)
Water Pump Impeller Kit – Fits Yamaha F9.9/F13.5/F15/F20 Outboard Motors (Replaces 6AH-W0078-00-00) is backordered and will ship as soon as it is back in stock.
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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.
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Water Pump Impeller Kit – Fits Yamaha F9.9/F13.5/F15/F20 Outboard M...
Water Pump Impeller Kit – Fits Yamaha F9.9/F13.5/F15/F20 Outboard Motors (Replaces 6AH-W0078-00-00) is backordered and will ship as soon as it is back in stock.
Product Details
This complete Water Pump Impeller Kit provides everything needed to restore the cooling system on Yamaha 4-Stroke F9.9, F13.5, F15, and F20 outboard engines from 2006 to 2023. A functional impeller is critical for circulating raw water to prevent the engine from overheating, ensuring reliability and longevity.
It is a direct replacement for Yamaha part numbers 6AH-W0078-00-00, 6AH-W0078-01-00, 6AH-W0078-02-00, and Sierra interchange 18-3479, guaranteeing proper fit and function.
- Installs in the lower unit of the outboard motor.
- Kit includes all necessary components: impeller, housing, plate, and gaskets.
- Restores cooling system performance for optimal engine temperature.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Yamaha | 6AH-W0078-00-00 |
| Yamaha | 6AH-W0078-01-00 |
| Yamaha | 6AH-W0078-02-00 |
| Sierra | 18-3479 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
This kit is designed specifically for the following Yamaha 4-Stroke outboards.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F9.9 | 9.9 | 4-Stroke | 2009–2016 | 6AH-W0078-00-00 | Model codes 6CA1-6AC9 |
| Yamaha | F13.5 | 13.5 | 4-Stroke | 2007–2009 | 6AH-W0078-00-00 | Model codes 6AF1-6AF3 |
| Yamaha | F15 | 15 | 4-Stroke | 2007–2016 | 6AH-W0078-00-00 | Model codes 6AG1-6AG9, 6AGA-6AGB |
| Yamaha | F15C | 15 | 4-Stroke | 2006–2023 | 6AH-W0078-00-00 | Including F15CEHL, F15CEHS, F15CMHL, F15CMHS |
| Yamaha | F15L | 15 | 4-Stroke | 2006–2023 | 6AH-W0078-00-00 | Including F15LEHA, F15LMHA |
| Yamaha | F20 | 20 | 4-Stroke | 2007–2016 | 6AH-W0078-00-00 | Model codes 6AH1-6AH9, 6AHA-6AHB |
| Yamaha | F20A | 20 | 4-Stroke | 2006–2021 | 6AH-W0078-00-00 | |
| Yamaha | F20B | 20 | 4-Stroke | 2007–2017 | 6AH-W0078-00-00 | Models F20BEHPL, F20BEPL, F20BMHL, F20BMHS |
| Yamaha | F20L | 20 | 4-Stroke | 2006–2020 | 6AH-W0078-00-00 | Including F20LMHA, F20LPA, F20LPHA |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Lower Unit
What’s in the Box
- 1 x Water Pump Housing (6AH-44311-00-00)
- 1 x Cartridge Insert (63V-44322-00-00)
- 1 x Water Seal Damper (6L2-44367-00-00)
- 1 x Impeller (63V-44352-01-00)
- 1 x Woodruff Key (664-44338-00-00)
- 1 x O-Ring (93210-49046-00)
- 1 x Cartridge Outer Plate (68T-44323-00-00)
- 2 x Dowel Pin (93604-10M03-00)
- 4 x Bolt (97095-08045-00)
- 2 x Plate (63V-44328-01-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the lubricant.
- Remove the bolts securing the lower unit to the engine's upper casing.
- Carefully lower and separate the lower unit. Be mindful of the driveshaft and shift shaft connections.
- Unbolt and remove the old water pump housing assembly from the lower unit.
- Clean the mating surfaces thoroughly and remove the old impeller, woodruff key, and gaskets.
- Install the new components from the kit in the reverse order of removal. Lightly grease the new O-ring and interior of the housing.
- Ensure the new impeller vanes are oriented correctly (in the direction of driveshaft rotation, typically clockwise).
- Bolt the new housing down to the manufacturer's specified torque.
- Reinstall the lower unit, carefully aligning the driveshaft, shift shaft, and water tube. Secure with bolts.
- Refill the gearcase with the correct type and amount of fresh lubricant before reinstalling the drain screw.
- Before starting the engine, use a water supply (flushing muffs) to test for proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
How can I confirm this kit fits my specific engine?
This kit fits a wide range of Yamaha 4-stroke models from F9.9 to F20 (2006–2023). The best method is to cross-reference your engine's model code and year with our "Engine & Model Compatibility" table. You can also match the OEM part number from your service manual (e.g., 6AH-W0078-00-00) with our "Part Number Matrix."
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and reduced engine performance as the ECU limits RPM to prevent damage. A visual inspection of the old impeller may reveal cracked, brittle, or missing vanes.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. If you frequently operate in saltwater or sandy/murky conditions, more frequent inspections and replacements are advised.
Is this an OEM part or an aftermarket replacement?
This listing is for an aftermarket replacement part, not an original equipment manufacturer (OEM) component. It has been engineered to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
How much is shipping and how fast will it arrive?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free on all orders. Expedited shipping options, if available for your location, will be presented at checkout for an additional cost.
What is the warranty and return policy?
This product is covered by a 1-year manufacturer’s warranty against defects under normal marine use. If you encounter an issue, please contact our support team with your order details for assistance. Returns are accepted within our standard return window for items that are unused and in their original condition. Please see our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before installation. If anything differs—even if your model appears compatible—do not purchase or install.
- This is an aftermarket replacement part, not an OEM component. All mentions of brand names and part numbers are for reference purposes only.
- Professional installation by a qualified marine mechanic is highly recommended for safety and performance. Improper installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world saltwater and freshwater conditions.
- Fast Global Fulfillment — With warehouses worldwide, we offer free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
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