Water Pump Repair Kit – Fits Yamaha 4–5 HP Outboards (Replaces 6E0-W0078-A2-00)
Water Pump Repair Kit – Fits Yamaha 4–5 HP Outboards (Replaces 6E0-W0078-A2-00) 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 4–5 HP Outboards (Replaces 6E0-...
Product Details
This Water Pump Repair Kit – Fits Yamaha 4–5 HP Outboards (Replaces 6E0-W0078-A2-00) is designed for specific Yamaha 4 HP and 5 HP 2-Stroke outboard motors manufactured in 1996. It provides all the necessary components for a complete water pump service to restore cooling performance.
The kit serves as a direct interchange for Yamaha OEM part number 6E0-W0078-A2-00.
- Complete kit includes housing, impeller, gaskets, and hardware.
- Designed for direct replacement of the original pump assembly.
- Restores cooling system to factory specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6E0-W0078-A2-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 4MLHU | 4 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 4MLHU2 | 4 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 4MSHU | 4 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 4MSHU2 | 4 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 5MLHU | 5 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 5MLHU2 | 5 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 5MSHU | 5 | 2-Stroke | 1996 | 6E0-W0078-A2-00 | |
| Yamaha | 5MSHU2 | 5 | 2-Stroke | 1996 | 6E0-W0078-A2-00 |
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct Replacement
- Fitting Type
- Direct Fit
- Dimensions
- 10.0" L x 10.5" W x 7.5" H
- Other Technical Attributes
- Complete kit with housing and all components
What’s in the Box
- 1 x Housing, Water Pump (6E0-44311-00-00)
- 1 x Gasket, Water Pump (6E0-44315-A0-00)
- 1 x Insert, Cartridge (6E0-44322-02-00)
- 1 x Outer Plate, Cartridge (6E0-44323-00-00)
- 1 x Impeller (6E0-44352-00-00)
- 1 x Damper, Water Seal 2 (6E0-44366-01-00)
- 1 x Pin, Dowel (93604-09066-00)
- 4 x Bolt (97080-06045-00)
Installation Notes
- Disconnect the engine's battery and remove the lower unit cowling.
- Carefully unbolt and detach the lower unit (gearcase) from the engine's midsection.
- Locate and unbolt the existing water pump housing. Remove the old impeller and other components.
- Thoroughly clean the mating surfaces where the new gaskets and plates will sit.
- Assemble the new kit, installing the new cartridge, impeller, and gaskets into the new housing.
- Securely install the new water pump assembly onto the driveshaft.
- Reinstall the lower unit, ensuring all connections are tight and correctly aligned.
- Once assembled, test the engine in water to confirm a strong and steady stream from the tell-tale outlet.
Troubleshooting & FAQ
Will this repair kit fit my Yamaha 4-stroke model?
This kit is specifically confirmed for the 2-Stroke Yamaha models from 1996 listed in the compatibility chart. While some sources suggest potential 4-stroke fitment, it is not verified. Please check your OEM part number to ensure compatibility.
What are the signs that my water pump is failing?
Common symptoms include the engine overheating, a weak or non-existent water stream from the tell-tale outlet, and a melted or deformed water pump housing upon inspection.
How often should I replace my outboard's water pump impeller?
As a general maintenance guideline, it is recommended to inspect and/or replace the water pump impeller every one to two years, or every 100-200 hours of operation, to prevent overheating and engine damage.
Does this kit include a new housing?
Yes, this is a complete repair kit that includes the water pump housing, impeller, gaskets, plates, and all necessary mounting hardware for a full rebuild.
My outboard is a 1995 model. Will this kit fit?
Fitment is only confirmed for the 1996 models listed. While it may fit other years, it is critical to verify the required OEM part number for your specific engine model and year before ordering.
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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