Water Pump Impeller Kit – Fits Yamaha F75-F100 (Replaces 61A-W0078-A3-00, 61A-W0078-A2-00, 61A-W0078-A4-00)
Water Pump Impeller Kit – Fits Yamaha F75-F100 (Replaces 61A-W0078-A3-00, 61A-W0078-A2-00, 61A-W0078-A4-00) 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 Impeller Kit – Fits Yamaha F75-F100 (Replaces 61A-W0078-...
Water Pump Impeller Kit – Fits Yamaha F75-F100 (Replaces 61A-W0078-A3-00, 61A-W0078-A2-00, 61A-W0078-A4-00) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller Kit is engineered for Yamaha F75, F80, F90, and F100 4-stroke outboard engines manufactured between 1999 and 2013. It provides a reliable, direct-fit solution for maintaining your engine's cooling system and preventing overheating.
This kit serves as a direct cross-reference for Yamaha part numbers 61A-W0078-A3-00, 61A-W0078-A2-00, and 61A-W0078-A4-00, as well as aftermarket equivalents like Sierra 18-3396-1 and Mallory 9-48618.
- Direct OEM-style bolt-on assembly for straightforward installation.
- Includes a tough neoprene marine rubber impeller for durability and performance.
- Comes as a complete rebuild kit including the housing, gaskets, and hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 61A-W0078-A3-00 |
| Yamaha | 61A-W0078-A2-00 |
| Yamaha | 61A-W0078-A4-00 |
| Sierra | 18-3396-1 |
| Mallory | 9-48618 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for the following Yamaha 4-stroke outboard models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F75 | 75 | 4-Stroke | 1999–2003 | 61A-W0078-A3-00 | |
| Yamaha | F80A, F80AET, F80TLR, F80TJR | 80 | 4-Stroke | 1999–2003 | 61A-W0078-A3-00 | |
| Yamaha | F80B, F80BET | 80 | 4-Stroke | 2005–2015 | 61A-W0078-A3-00 | |
| Yamaha | F90 | 90 | 4-Stroke | 2003–2011 | 61A-W0078-A3-00 | 68V, 68V0, 68W0 series |
| Yamaha | F100A, F100AET, F100TLR, F100TRZ | 100 | 4-Stroke | 1999–2006 | 61A-W0078-A3-00 | |
| Yamaha | F100DET | 100 | 4-Stroke | 2005–2015 | 61A-W0078-A3-00 | 68V, 68V0, 68W0 series |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct OEM replacement
- Connection
- Bolt-on assembly
- Kit Contents
- Complete rebuild kit with housing
- Housing Material
- Plastic/Nylon PA66
- Impeller Material
- Neoprene Marine Rubber
- Weight
- 454g (16 oz)
What’s in the Box
- 1 x Cartridge Insert (61A-44322-02-00)
- 1 x O-Ring (93210-86M38-00)
- 1 x O-Ring (93210-37M67-00)
- 1 x Impeller (6E5-44352-01-00)
- 1 x Cartridge Outer Plate (6G5-44323-01-00)
- 1 x Water Pump Gasket (6E5-44315-A0-00)
- 2 x Dowel Pins (93606-12019-00)
- 4 x Bolts, With Washer (90119-08M14-00)
- 1 x Woodruff Key (90280-04M05-00)
Installation Notes
- Disconnect the battery and remove the engine cover for safety.
- Place the outboard in neutral and remove the lower unit (gearcase) from the midsection.
- Unbolt and carefully detach the old water pump housing assembly from the driveshaft.
- Thoroughly clean all mating surfaces, ensuring no old gasket material or debris remains.
- Assemble the new components from the kit. Lightly lubricate the impeller and inside of the housing with marine grease before inserting the impeller, turning the driveshaft in the direction of engine rotation.
- Install the new water pump assembly, ensuring the Woodruff key is properly seated. Tighten the bolts to the manufacturer's recommended torque specifications in a crisscross pattern.
- Reinstall the lower unit, reconnect all linkages, and secure it. Reconnect the battery and test engine operation with a proper water supply, confirming a strong tell-tale stream.
Troubleshooting & FAQ
How do I know if this kit fits my specific Yamaha engine?
The surest way is to check your engine's model and year against our compatibility table. Pay close attention to any model series notes (e.g., 68V, 68W0). When in doubt, compare the part numbers stamped on your old components with those listed in 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, steam from the exhaust, or a noticeable drop in engine performance as the ECU reduces power to prevent damage.
How often should a water pump impeller be replaced?
As a preventative maintenance item, we recommend replacement every 1 to 2 years or every 100-200 hours of operation. Service intervals should be shorter if you frequently operate in sandy, silty, or saltwater conditions.
Is this kit difficult to install myself?
Installation is manageable for those with mechanical experience and the right tools. However, it involves removing the lower unit, which can be heavy and requires careful re-alignment. If you are not comfortable with this process, professional installation is recommended.
Is grease required for installation?
Yes. A light coat of marine-grade grease or a soap-and-water solution on the impeller and inside the pump housing will ease installation and prevent damage to the impeller during the first dry start.
OEM vs. Aftermarket?
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.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
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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