Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)
Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (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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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Rep...
Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (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 is a complete Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00). It is designed for Yamaha 4-Stroke models from 40 to 70 HP (2011–2016), including F40GET and F70A/AET series outboards, providing all necessary components for a full service.
This kit serves as a direct replacement for Yamaha 6CJ-W0078-00-00 and 6CJ-W0078-01-00, Sierra 18-3494, and Quicksilver 8M6012800 (F70 application only).
- Installation Location: Mounts in the lower unit gearcase.
- Service Scope: Includes all essential gaskets, seals, and the impeller for a complete water pump rebuild.
- Quality: Built with OEM-quality materials for reliable performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6CJ-W0078-00-00 | |
| Yamaha | 6CJ-W0078-01-00 | Supersedes 6CJ-W0078-00-00 |
| Sierra | 18-3494 | |
| Quicksilver | 8M6012800 | F70 Application |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, verify your model code (e.g., 62Y, 6D7) and production year range match the compatibility data listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F40GET | 40 | 4-Stroke | 2011–2015 | 6CJ-W0078-00-00 | Model code 62Y>62Y6 |
| Yamaha | F70A, AET | 70 | 4-Stroke | 2011–2015 | 6CJ-W0078-00-00 | Model code 6D71>6D79, 6D7A>6D7C |
| Yamaha | F70LA | 70 | 4-Stroke | 2011–2016 | 6CJ-W0078-00-00 | All F70LA variants (0112-0116, 0310, 0410, 0411) |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Lower Unit
- Other Technical Attributes
- OEM quality replacement parts for complete water pump service
What’s in the Box
- 1 x Insert, Cartridge (63D-44322-00-00)
- 1 x Gasket, Water Pump (6CJ-44315-00-00)
- 1 x Cover, Pump Housing (63D-44312-00-00)
- 1 x Damper, Water Seal 2 (663-44366-00-00 / 663-44366-01-00)
- 1 x Impeller (6H3-44352-00-00 / 6H4-44352-02-00)
- 1 x Key, Woodruff (90280-03M03-00)
- 2 x Oil Seal (93101-23070-00)
- 1 x O-Ring (93210-46044-00 / 93210-59MG7-00)
- 1 x Gasket, Water Pump (6CJ-44316-00-00 / 63D-44316-00-00)
- 1 x Outer Plate, Cartridge (6CJ-44323-00-00 / 63D-44323-00-00)
- 1 x Gasket, Cartridge (6CJ-44324-00-00)
- 2 x Pin, Dowel (93604-10M03-00)
- 2 x Bolt, With Washer (90119-08M33-00)
- 2 x Bolt, With Washer (90119-08M14-00 / 90119-08M15-00)
Installation Notes
- Disconnect the battery and shift the engine into neutral.
- Place a drain pan under the lower unit and remove the gear lube drain screw to drain the oil.
- Remove the bolts securing the lower unit to the midsection. Carefully separate the lower unit.
- Unbolt and remove the old water pump housing assembly.
- Remove the old impeller, key, gaskets, and seals, noting their orientation.
- Thoroughly clean the driveshaft and all mating surfaces of any old gasket material or corrosion.
- Install the new Woodruff key and slide the new impeller onto the driveshaft.
- Assemble the new housing with the new gaskets, o-rings, and seals as provided in the kit.
- Carefully guide the newly assembled water pump and lower unit back into place, ensuring the driveshaft and shift shaft align.
- Tighten all lower unit bolts to the manufacturer's specified torque.
- Refill the lower unit with fresh gear lube until it emerges from the upper vent hole.
- Reconnect the battery, attach a water supply ("muffs"), and test run the engine to confirm proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
Does this kit fit my specific F70LA model?
This kit is confirmed to fit all Yamaha F70LA variants manufactured between 2011 and 2016. To be certain, always cross-reference the OEM part number (6CJ-W0078-00-00) with your engine's service manual before ordering.
My old impeller is 6H3-44352-00-00. Will the 6H4-44352-02-00 in some kits work?
Yes, both impeller part numbers are valid and interchangeable for this application. Manufacturers often supersede parts or have multiple valid numbers that can vary between production runs.
What are the signs of a failing water pump?
Common symptoms include a weak or intermittent water stream from the "tell-tale" cooling outlet, engine overheating alarms, or a noticeable drop in performance. A visual inspection that reveals a cracked, brittle, or deformed impeller also indicates an immediate need for replacement.
How often should I replace my water pump components?
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 operation. Service intervals should be shorter for boats used frequently in saltwater or silty/sandy conditions.
Is this an OEM Yamaha part?
This is an aftermarket replacement part, not an OEM component. It has been engineered to meet or exceed original equipment manufacturer (OEM) specifications using comparable materials. Our parts are made in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for all orders. Expedited shipping options and associated costs, where available, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original packaging. Refer to our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before installation. If anything appears different—even if your model is listed as compatible—do not install the part and contact us for confirmation.
- This is an aftermarket replacement component, not an Original Equipment Manufacturer (OEM) part.
- Professional installation is highly recommended to ensure safety, proper function, and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability and longevity.
- Fast Global Fulfillment — We offer free standard delivery to most regions worldwide, with typical delivery in 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
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