Water Pump Impeller Repair Kit – Fits Yamaha 70 HP F70A 4-Stroke (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)
Water Pump Impeller Repair Kit – Fits Yamaha 70 HP F70A 4-Stroke (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00) 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 Repair Kit – Fits Yamaha 70 HP F70A 4-Stroke (R...
Water Pump Impeller Repair Kit – Fits Yamaha 70 HP F70A 4-Stroke (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit is designed for Yamaha 70 HP F70A 4-stroke outboard motors manufactured from 2010 to 2021. It fits models with serial numbers beginning with 6D7, ensuring broad compatibility within this engine series.
This kit serves as a direct replacement for Yamaha part numbers 6CJ-W0078-00-00 and 6CJ-W0078-01-00, as well as Sierra 18-3494 and KUNOANZ KU-002017.
- Installation is a direct replacement, requiring access to the lower unit.
- Includes all necessary gaskets, seals, and hardware for a complete service.
- Engineered with durable plastic and metal components for reliability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6CJ-W0078-00-00 | 6CJ-W0078-01-00 |
| Yamaha | 6CJ-W0078-01-00 | |
| Sierra | 18-3494 | |
| KUNOANZ | KU-002017 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F70LA | 70 | 4-Stroke | 2010–2021 | 6CJ-W0078-00-00, 6CJ-W0078-01-00 | Models with serial numbers starting with 6D7 |
| Yamaha | F70A, AET | 70 | 4-Stroke | 2011–2015 | 6CJ-W0078-00-00 | Serial numbers 6D71-6D79, 6D7A-6D7C |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement; requires access to lower unit
- Housing Material
- Plastic and metal components
- Housing Color
- Black/Silver
- Fitting Type
- Direct fit
- Warranty
- 1 Year (Aftermarket)
- Other Technical Attributes
- Complete water pump service kit including gaskets, seals, and hardware
What’s in the Box
- 1 x Cover, Water Pump Housing (63D-44312-00/18-9083)
- 1 x Cup, Insert (63D-44322-00/18-3449)
- 2 x Seal, Water Damper (663-44366-00/18-1830)
- 1 x Gasket, Water Pump (6CJ-44315-00/18-0448)
- 1 x Gasket, Water Pump (6CJ-44316-00/18-0449)
- 1 x Gasket, Water Pump (6CJ-44324-00/18-0450)
- 1 x Plate, Wear (6CJ-44323-00/18-3186)
- 1 x Impeller (6H3-44352-00/18-3069)
- 2 x Bolt, With Washer (90119-08M14)
- 2 x Bolt, With Washer (90119-08M33/18-0260)
- 1 x Key, Woodruff (697) (90280-03M03/18-3297)
- 2 x Oil Seal (663) (93101-23070/18-0297)
- 1 x O-Ring (93210-46044/18-7436)
- 2 x Pin, Dowel (688) (93604-10M03/18-43717)
Installation Notes
- Disconnect the battery and shift the outboard to neutral.
- Remove the lower unit (gearcase) from the engine.
- Unbolt and remove the old water pump housing and its components.
- Carefully inspect, clean, and remove the old impeller, gaskets, seals, and wear plate.
- Install the new components from the kit in the reverse order of removal, ensuring correct orientation.
- Lightly grease the new impeller and inside of the housing to prevent damage on initial startup.
- Reinstall the pump housing and torque bolts to manufacturer specifications.
- Reattach the lower unit, ensuring all shift and drive shaft connections are secure.
- Start the engine using a water supply (flushing muffs) and verify a steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my Yamaha F70A?
This kit is designed for Yamaha F70A 4-stroke models from 2010–2021. Check your engine's serial number; it is specifically compatible with models starting with 6D7. You can also compare your existing part numbers to those listed in the Part Number Matrix.
What are the signs my water pump needs to be replaced?
Common signs of a failing water pump include the engine overheating, a weak or inconsistent stream of water from the "telltale" outlet, or visible damage to the old impeller such as cracked, brittle, or missing vanes.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect your water pump annually and replace the impeller and gaskets every 1–2 years or every 100–200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).
What's the difference between this kit and an OEM Yamaha kit?
This is an aftermarket kit designed to meet or exceed OEM specifications. It includes all the necessary components for a full replacement at a more competitive price point, using high-quality materials for reliable performance.
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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