Water Pump Repair Kit – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-W0078-02-00)
Water Pump Repair Kit – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-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 F15C/F20 4-Stroke Outboards (Re...
Water Pump Repair Kit – Fits Yamaha F15C/F20 4-Stroke Outboards (Replaces 6AH-W0078-00-00, 6AH-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 F15C/F20 4-Stroke Outboards provides all necessary components to restore your engine's cooling system. It is specifically designed for Yamaha F15C and F20 four-stroke outboard models from 2006 to 2023, ensuring a precise fit and reliable performance.
It serves as a direct interchange for Yamaha OEM part numbers 6AH-W0078-00-00 and the updated version, 6AH-W0078-02-00.
- Engineered for direct OEM replacement installation.
- Includes a new impeller, housing, and wear plates for a complete overhaul.
- Restores cooling efficiency to prevent engine overheating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6AH-W0078-00-00 | Original OEM part number. |
| Yamaha | 6AH-W0078-02-00 | Updated/superseded OEM part number. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F15C | 15 | 4-Stroke | 2006–2023 | 6AH-W0078-00-00 | Also fits 6AH-W0078-02-00 |
| Yamaha | F20 | 20 | 4-Stroke | 2006–2021 | 6AH-W0078-00-00 | Also fits 6AH-W0078-02-00 |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct OEM Replacement
- Other Technical Attributes
- For use with Yamaha F15C and F20 four-stroke outboard engines
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 (93604-12M07-00)
- 4 x Bolt (97095-08045-00)
- 2 x Plate (63V-44328-01-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the gearcase oil from the lower unit.
- Remove the mounting bolts securing the lower unit to the midsection.
- Carefully separate the lower unit from the engine.
- Unscrew the bolts on the water pump housing and lift it off.
- Remove the old impeller, Woodruff key, wear plates, and gaskets.
- Clean the housing and driveshaft surfaces thoroughly.
- Install the new components from the kit, ensuring the impeller vanes are oriented correctly.
- Secure the new housing and torque bolts to manufacturer specifications.
- Reinstall the lower unit, ensuring the driveshaft and water tube align.
- Refill the gearcase with the correct grade and amount of oil.
- Reconnect the battery and test operation in a safe water environment, checking for a strong telltale stream.
Troubleshooting & FAQ
How do I know if this kit fits my Yamaha outboard?
Check your engine model and year against the compatibility table. This kit is specifically for Yamaha F15C (2006–2023) and F20 (2006–2021) models. Verifying the OEM part number 6AH-W0078-00-00 or 6AH-W0078-02-00 also confirms a match.
What are the signs of a failing water pump?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the telltale outlet, and a noticeably brittle, cracked, or worn impeller upon physical inspection.
How often should the water pump be serviced?
For preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 years or 200-300 hours of use, whichever comes first. This interval can be shorter in saltwater or high-debris environments.
Is this the same as the 6AH-W0078-02-00 kit?
Yes, this kit is a direct aftermarket replacement for both OEM part numbers 6AH-W0078-00-00 and its updated counterpart, 6AH-W0078-02-00. The contents are designed to be identical for a proper fit.
Does this kit include a new housing?
Yes, this is a complete repair kit that includes the main water pump housing (6AH-44311-00-00) along with the impeller, cartridge, plates, O-ring, and all necessary hardware for a full overhaul.
What is the most critical part of the installation?
Ensuring the Woodruff key is properly seated on the driveshaft flat spot before sliding on the new impeller is critical. Additionally, when sliding the housing down, be sure to turn the driveshaft clockwise to correctly flex the impeller vanes without damaging them.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout if they are available for your location.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused parts in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
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