Water Pump Repair Kit – Fits Yamaha F40 4-Stroke Outboard (Replaces 6BG-W0078-00-00/6BG-W0078-01-00)
Water Pump Repair Kit – Fits Yamaha F40 4-Stroke Outboard (Replaces 6BG-W0078-00-00/6BG-W0078-01-00) 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 F40 4-Stroke Outboard (Replaces...
Product Details
This Water Pump Repair Kit – Fits Yamaha F40 4-Stroke Outboard (Replaces 6BG-W0078-00-00/6BG-W0078-01-00) provides all necessary components to restore your cooling system. It is designed specifically for Yamaha F40 4-stroke outboard engines from 2009 and newer, ensuring reliable performance and proper fit.
This kit serves as a direct replacement for Yamaha part numbers 6BG-W0078-00-00 (which is superseded by 6BG-W0078-01-00) and Sierra aftermarket part 18-3490.
- Engineered for direct-fit installation.
- Includes all essential gaskets, seals, and a new impeller.
- Restores cooling efficiency to prevent overheating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6BG-W0078-00-00 | 6BG-W0078-01-00 |
| Sierra | 18-3490 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, this kit covers a range of F30 and F40 models primarily from 2008 and newer. Verify your specific model and year against the list.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F40 | 40 | 4-Stroke | 2010 & Newer | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Yamaha Online Parts |
| Yamaha | F30LA | 30 | 4-Stroke | 2013–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F30LEHA | 30 | 4-Stroke | 2013–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F40JEA | 40 | 4-Stroke | 2009–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F40JEHA | 40 | 4-Stroke | 2009–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F40LA | 40 | 4-Stroke | 2008–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F40LEHA | 40 | 4-Stroke | 2008–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
| Yamaha | F40SA | 40 | 4-Stroke | 2018–2020 | 6BG-W0078-00-00/6BG-W0078-01-00 | Per Offshore Marine |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct replacement
- Dimensions
- Height: 9.5; Width: 12.0; Length: 15.5;
- Warranty
- Varies by seller (up to 1 year from MOTOCEO)
- Other Technical Attributes
- Complete kit for water pump repair
What’s in the Box
- 1 x Pump Housing Cover (63D-44312-00-00)
- 1 x Water Pump Gasket (63D-44316-00-00)
- 1 x Insert Cartridge (63D-44322-00-00)
- 1 x Cartridge Outer Plate (63D-44323-00-00)
- 1 x Water Seal Damper 2 (663-44366-00-00)
- 1 x Impeller (6H4-44352-02-00)
- 4 x Bolts, With Washer (90119-08M15-00)
- 1 x Woodruff Key (90280-03M03-00)
- 1 x O-Ring (93210-59MG7-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Place a drain pan under the lower unit and remove the drain screw to empty the gearcase oil.
- Remove the bolts securing the lower unit (gearcase) to the upper casing.
- Carefully lower the gearcase to access the water pump assembly.
- Unbolt and remove the old water pump housing to expose the impeller.
- Remove the old impeller, woodruff key, gaskets, and wear plates.
- Clean all mating surfaces thoroughly, removing any old gasket material or corrosion.
- Install the new gasket, wear plate, woodruff key, and impeller from the kit. Ensure the impeller vanes are oriented correctly.
- Install the new pump housing and seals, tightening bolts to the manufacturer's recommended torque.
- Reinstall the lower unit, ensuring the driveshaft and water tube align correctly.
- Refill the gearcase with the specified marine gear lubricant.
- Reconnect the battery and test the engine using a water supply (flushing muffs) to verify proper cooling system operation.
Troubleshooting & FAQ
How do I know if this water pump kit will fit my Yamaha engine?
This kit is designed for specific Yamaha models, including the F40 (2009+) and select F30 models. The most reliable method is to check your engine's model number and year against our compatibility table. You can also match your existing OEM part number to 6BG-W0078-00-00 or 6BG-W0078-01-00.
What are the common signs of a failing water pump?
A weak or intermittent water stream from the "tell-tale" port is the most common indicator. Other signs include the engine overheating alarm sounding, steam from the exhaust, or the engine running hotter than usual at idle or low speeds.
How often should the water pump impeller be replaced?
As a general maintenance rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions. Frequent use in saltwater or sandy/silty water may require more frequent replacement.
Can I replace just the impeller instead of the whole kit?
While possible, it is highly recommended to replace the entire kit. The housing, wear plates, gaskets, and seals wear out over time. Replacing only the impeller can result in poor sealing and premature failure, leading to overheating.
My engine is overheating, but the water pump is new. What else could it be?
If a new water pump kit doesn't solve an overheating issue, check for other blockages in the cooling system. This can include clogged thermostats, debris in cooling passages or water intake screens, or a faulty pressure control valve.
Are special tools required for installation?
Basic mechanic's tools like a socket set, torque wrench, and screwdrivers are required. A flywheel puller is not needed for this job. For safety and to prevent damage, following the torque specifications in a service manual is advised.
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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