Water Pump Repair Kit – Fits Yamaha 9.9/15HP Outboards (Replaces 682-W0078-A1-00)
Water Pump Repair Kit – Fits Yamaha 9.9/15HP Outboards (Replaces 682-W0078-A1-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Repair Kit – Fits Yamaha 9.9/15HP Outboards (Replaces 68...
Product Details
This Water Pump Repair Kit – Fits Yamaha 9.9/15HP Outboards (Replaces 682-W0078-A1-00) provides all the essential components to restore your engine’s cooling system. It is designed for a precise fit on Yamaha 2-Stroke 9.9/15HP (1984–1995) and F9.9/T9.9/FT9.9 4-Stroke (1985–1996) models.
It serves as a direct replacement for various OEM and aftermarket part numbers, including Yamaha 682-W0078-A1-00, Sierra 18-3148, and others, ensuring broad compatibility.
- Engineered for direct OEM replacement fit and function.
- Includes all necessary gaskets, impeller, wear plate, and hardware for a complete overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 682-W0078-A1-00, 682-W0078-01-00, 682-W0078-00-00 |
| Sierra | 18-3148 |
| Mercury | 84277T, 46-84277M |
| EMP | 46-02077 |
| GLM Marine | 12278 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Owners: This kit covers a wide range of 9.9 HP and 15 HP two-stroke and four-stroke outboards from 1984 to 1996. Verify your model code (e.g., 6E7, 6G8) against the list for an exact match.
For Mercury Owners: This kit fits specific 9.9 HP (682) and 15 HP (684) two-stroke models. The OEM part number is 46-84277T.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9D (6E7) | 9.9 | 2-Stroke | 1984–1995 | 682-W0078-A1-00 | |
| Yamaha | 15D (6E8) | 15 | 2-Stroke | 1984–1995 | 682-W0078-A1-00 | |
| Yamaha | F9.9A (6G8) | 9.9 | 4-Stroke | 1985–1996 | 682-W0078-A1-00 | |
| Yamaha | F9.9B (6G9) | 9.9 | 4-Stroke | 1985–1996 | 682-W0078-A1-00 | |
| Yamaha | FT9.9A | 9.9 | 4-Stroke | 1985–1990 | 682-W0078-A1-00 | |
| Yamaha | T9.9 | 9.9 | 4-Stroke | 1991–1996 | 682-W0078-A1-00 | |
| Yamaha | 9.9ELN/ESN/LN/SN | 9.9 | 2-Stroke | 1984 | 682-W0078-A1-00 | |
| Yamaha | 9.9ELK/ESK/LK/SK | 9.9 | 2-Stroke | 1985 | 682-W0078-A1-00 | |
| Yamaha | 15ELN/ESN/LN/SN | 15 | 2-Stroke | 1984 | 682-W0078-A1-00 | |
| Yamaha | 15ELK/ESK/LK/SK | 15 | 2-Stroke | 1985 | 682-W0078-A1-00 | |
| Yamaha | Various 9.9/15 models | 9.9/15 | 2-Stroke | 1984–1995 | 682-W0078-A1-00 | See fitment grid for specific model codes |
| Mercury | 9.9 (682) | 9.9 | 2-Stroke | 46-84277T | ||
| Mercury | 15C (684) | 15 | 2-Stroke | 46-84277T |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct OEM Replacement
- Dimensions
- 15.5" L x 12.0" W x 9.0" H
- Weight
- 0.25 kg (0.55 lb)
- Warranty
- Manufacturer's Standard Warranty
- Other Technical Attributes
- Includes all necessary gaskets, impeller, wear plate, and hardware
What’s in the Box
- 1 x Impeller (682-44352-01-00/682-44352-03-00)
- 1 x Cartridge Insert/Cup (682-44322-00-00)
- 1 x Cartridge Outer Plate/Wear Plate (682-44323-00-00)
- 1 x Water Seal Damper (682-44365-00-00)
- 1 x Woodruff Key (90280-03024-00)
- 2 x Water Pump Gasket (682-44315-A0-00)
- 4 x Bolt (97095-06040-00)
Installation Notes
- Disconnect the battery and remove the engine cowling.
- Drain the gearcase oil into a suitable container.
- Unbolt and carefully slide the lower unit (gearcase) off the driveshaft housing.
- Remove the old water pump housing, impeller, gaskets, and wear plate. Note the orientation of all parts.
- Thoroughly clean the mating surfaces to ensure a proper seal.
- Install the new components from the kit in reverse order of disassembly. Lightly grease the new impeller.
- Reinstall the water pump housing and torque the bolts to the manufacturer's specified values.
- Apply sealant to gaskets if required and reinstall the lower unit.
- Refill the gearcase with the correct type and amount of oil.
- Reconnect the battery and test the engine's cooling system operation in water, ensuring a steady stream of water from the tell-tale port.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
The surest way is to match your engine's model and year to our compatibility chart. You can also verify by cross-referencing your existing part number with the equivalents in our Part Number Matrix.
What are the signs of a failing water pump?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and in severe cases, steam from the exhaust. Reduced engine performance can also be an indicator.
How often should I replace my water pump impeller?
As a general maintenance rule, most manufacturers recommend replacing the impeller every 1–2 years or every 100–200 hours of operation, whichever comes first. This interval can be shorter if you operate in sandy, silty, or saltwater conditions.
Is this a complete repair kit?
Yes, this kit includes everything shown in the "What's in the Box" section: impeller, housing insert, wear plate, gaskets, a woodruff key, and mounting bolts needed for a standard water pump service.
Can I install this kit myself?
If you have good mechanical skills and the correct tools, installation is manageable. However, due to the importance of the cooling system for engine health, we recommend professional installation if you are not fully confident.
What’s the difference between this and an OEM kit?
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.
How fast is shipping?
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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