Water Pump Repair Kit – Fits Yamaha F70 4-Stroke Outboard (Replaces 6CJ-W0078-00-00)
Water Pump Repair Kit – Fits Yamaha F70 4-Stroke Outboard (Replaces 6CJ-W0078-00-00) 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
Product Details
This Water Pump Repair Kit is designed for Yamaha F70 series 4-stroke outboard motors, covering models from 2010 to 2020. The kit provides all necessary components to restore the engine’s cooling system to factory specifications, ensuring reliable performance and preventing overheating.
It serves as a direct replacement for Yamaha part numbers 6CJ-W0078-00-00 and 6CJ-W0078-01-00, as well as Forestity 6CJ-W0078-00-00.
- Engineered for direct OEM-level replacement and fit.
- Constructed from durable rubber and stainless steel for longevity.
- Includes all essential gaskets, seals, and hardware for a complete overhaul.
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| Brand | Part Number | Superseded By |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 |
| Forestity | 6CJ-W0078-00-00 |
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| Yamaha | F70LA | 70 | 4-Stroke | 2010–2020 | 6CJ-W0078-00-00 | Superseded by 6CJ-W0078-01-00 |
| Yamaha | F70LA_0112 | 70 | 4-Stroke | 2011–2012 | 6CJ-W0078-00-00 | REPAIR KIT 2 |
| Yamaha | F70LA_0411 | 70 | 4-Stroke | 2011 | 6CJ-W0078-00-00 | REPAIR KIT 2 |
| Yamaha | F70LA 0113 | 70 | 4-Stroke | 2013 | 6CJ-W0078-00-00 | |
| Yamaha | F70LA 0114 | 70 | 4-Stroke | 2014 | 6CJ-W0078-00-00 | |
| Yamaha | F70LA 0115 | 70 | 4-Stroke | 2015 | 6CJ-W0078-00-00 | Models with S/N 6CJ-1051515 and older |
| Yamaha | F70LA 0116 | 70 | 4-Stroke | 2015–2016 | 6CJ-W0078-00-00 | Models with S/N 6CJ-1051515 and newer |
| Yamaha | F70LA 0117 | 70 | 4-Stroke | 2017–2020 | 6CJ-W0078-00-00 | |
| Yamaha | F70LA 0310 | 70 | 4-Stroke | 2010 | 6CJ-W0078-00-00 | |
| Yamaha | F70LA 0410 | 70 | 4-Stroke | 2010 | 6CJ-W0078-00-00 |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- OEM Direct Replacement
- Housing Material
- Rubber, Stainless Steel
- Product Dimensions
- 10.0" (L) x 8.0" (W) x 10.0" (H)
- Other Technical Attributes
- Compatible with cooling system of Yamaha F70 outboard engines
What’s in the Box
- 1 x Impeller (6H3-44352-00-00)
- 1 x Cartridge Insert (63D-44322-00-00)
- 1 x Outer Plate Cartridge (6CJ-44323-00-00)
- 1 x Water Pump Gasket (6CJ-44315-00-00)
- 1 x Water Pump Gasket (6CJ-44316-00-00)
- 1 x Cartridge Gasket (6CJ-44324-00-00)
- 1 x Water Pump Housing Cover (63D-44312-00-00)
- 1 x Water Seal Damper (663-44366-00-00)
- 1 x O-Ring (93210-46044-00)
- 1 x Woodruff Key (90280-03M03-00)
- 2 x Oil Seal (93101-23070-00)
- 2 x Dowel Pin (93604-10M03-00)
- 2 x Bolt with Washer (90119-08M33-00)
- 2 x Bolt with Washer (90119-08M14-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower unit gear lube.
- Remove the propeller and the lower unit mounting bolts. Carefully separate the lower unit from the upper casing.
- Unbolt and remove the water pump housing. Take note of the position of all parts.
- Remove the old impeller, gaskets, plates, and seals. Clean all housing and mounting surfaces thoroughly.
- Install the new components from the kit in the reverse order of removal. Ensure the impeller vanes are oriented correctly.
- Lightly grease the new impeller and internal housing surfaces with marine grease.
- Reassemble the water pump housing and torque bolts to manufacturer specifications.
- Reinstall the lower unit, refilling the gear lube with the correct type and amount.
- Reconnect the battery, start the engine in water, and confirm a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific Yamaha F70 model?
Check your engine’s serial number and model year. This kit is designed for all F70LA models produced between 2010 and 2020. You can verify compatibility by matching your model identifier with the list in the "Engine & Model Compatibility" section.
What are the signs of a failing water pump?
Common symptoms include a weak or inconsistent water stream from the engine's tell-tale outlet, engine overheating alarms, or a noticeable decrease in engine performance. A visual inspection may reveal a cracked or brittle impeller.
How often should the water pump impeller be replaced?
As a best practice for preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
The kit includes a 6H3-44352-00-00 impeller. Is this correct for the F70?
Yes. While the 6H3 series impeller is used across many Yamaha models (40hp-70hp), it is the correct specified component for the F70 engine's water pump assembly within this kit.
What is the difference between this kit and the OEM version?
This is an aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It uses comparable materials and includes all the necessary components for a full replacement at a more competitive price point.
My engine is still overheating after installing the new kit. What could be wrong?
If overheating persists, verify the impeller was installed with the vanes rotating in the correct direction. Check for blockages in the cooling water passages, thermostat issues, or a faulty pressure control valve. Ensure all gaskets and seals were seated correctly to prevent air leaks.
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.
Payment & Security
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