Gasket, Water Pump Housing – Fits Yamaha 40-50HP Outboards (Replaces 663-44315-A0-00)
Gasket, Water Pump Housing – Fits Yamaha 40-50HP Outboards (Replaces 663-44315-A0-00) 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
Free standard shipping on all orders under 1 KG
Gasket, Water Pump Housing – Fits Yamaha 40-50HP Outboards (Replace...
Product Details
This replacement Gasket, Water Pump Housing is designed for Yamaha 40-50HP 2-stroke and 4-stroke outboard engines. It creates a secure seal between the water pump housing and the wear plate, preventing leaks and ensuring proper cooling system pressure.
It serves as a direct replacement for Yamaha OEM part 663-44315-A0-00 and is an interchange for Sierra 18-0292 and SEI Marine 95-499-07A.
- Engineered to fit between the water pump housing and plate.
- Creates a reliable seal to prevent coolant leaks.
- Built to meet or exceed original equipment specifications for dependable performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 663-44315-00-00 | 663-44315-A0-00 |
| Yamaha | 663-44315-A0-00 | |
| Sierra | 18-0292 | |
| SEI Marine | 95-499-07A |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | OEM Part No. | Notes |
|---|---|---|---|---|
| Yamaha | 40-50HP | 40-50 | 663-44315-A0-00 | Water pump housing to plate gasket |
Technical Specs
- Product Type
- Water Pump Housing Gasket
- Installation
- Between water pump housing and plate
- Dimensions
- 11.0" L x 8.6" W x 0.2" H
- OEM Part Number
- Yamaha 663-44315-A0-00
- Superseded Part Numbers
- 663-44315-00-00
- Aftermarket Options
- Sierra 18-0292, SEI Marine 95-499-07A
What’s in the Box
- 1 x Gasket, Water Pump Housing (Replaces 663-44315-A0-00)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery.
- Remove the lower unit (gearcase) from the outboard's midsection.
- Carefully disassemble the water pump assembly, noting the orientation of each part.
- Remove the old gasket and thoroughly clean any residue from the mating surfaces of the housing and plate.
- Position the new gasket correctly onto the wear plate before reinstalling the housing.
- Reassemble the water pump components and torque all bolts to the manufacturer's specified values.
- Reinstall the lower unit and test the engine's cooling system function.
Troubleshooting & FAQ
How do I know if my water pump gasket is failing?
Common signs of a bad gasket include the engine running hotter than normal, a weak or inconsistent water stream from the tell-tale outlet, or visible water leaks from the water pump area on the lower unit.
Does this gasket fit all Yamaha 40-50HP models?
This gasket is designed for a wide range of Yamaha 40-50HP outboards. However, always confirm that 663-44315-A0-00 is the correct part number for your specific engine model and year by checking your service manual.
When should I replace my water pump gasket?
It is best practice to replace the water pump gasket and other seals every time you service the impeller, which is typically recommended every 1-2 years or 100-200 hours of operation.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and batch-inspected for consistency and quality.
How fast do you ship and what is the cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free to most locations, with expedited options appearing at checkout if available for your region.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — Our model ensures fair pricing without compromising on materials or quality control.
Payment & Security
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