Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 2-Stroke (Replaces 663-44324-A0)
Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 2-Stroke (Replaces 663-44324-A0) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
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.
Tracking information will be provided once your order ships.
Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 2-Stroke (Replac...
Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 2-Stroke (Replaces 663-44324-A0) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 2-Stroke (Replaces 663-44324-A0) is designed for Yamaha 2-stroke outboard engines, including 40 HP models from 1984–1994, 50 HP models from 1984–1987, 50 HP Pro Series from 1987–1990, and P50 models from 1995–1996. This gasket ensures a proper seal between water pump components, preventing leaks and maintaining efficient cooling system performance.
Direct replacement for Yamaha OEM part number 663-44324-A0.
- Precision-cut gasket for accurate fitment and reliable sealing
- Essential component for water pump rebuild and maintenance
- Compatible with saltwater and freshwater applications
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 663-44324-A0 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years |
|---|---|---|---|---|
| Yamaha | Outboard | 40 HP | 2-Stroke | 1984–1994 |
| Yamaha | Outboard | 50 HP | 2-Stroke | 1984–1987 |
| Yamaha | Pro Series 50 | 50 HP | 2-Stroke | 1987–1990 |
| Yamaha | P50 | 50 HP | 2-Stroke | 1995–1996 |
Technical Specs
- Part Type
- Water Pump Impeller Gasket
- OEM Part Number
- 663-44324-A0
- Application
- Yamaha 2-Stroke Outboard Engines
- Compatibility
- 40 HP, 50 HP
What's in the Box
- 1 × Water Pump Impeller Gasket 663-44324-A0
Installation Notes
- Disconnect the spark plug wire and drain the lower unit before beginning work.
- Remove the lower unit from the engine following your service manual procedures.
- Disassemble the water pump housing and remove the old gasket completely.
- Clean all mating surfaces thoroughly, removing old gasket material and debris.
- Position the new gasket on the pump housing, aligning all bolt holes.
- Reassemble the water pump components in reverse order, ensuring proper alignment.
- Torque all fasteners to manufacturer specifications to prevent leaks.
- Reinstall the lower unit and reconnect all components.
- Test the cooling system for proper water flow and check for leaks before operating.
Troubleshooting & FAQ
How often should I replace this gasket?
Replace the impeller gasket whenever you service or rebuild the water pump, typically every 2–3 years or as recommended by your engine's maintenance schedule. Always install a new gasket rather than reusing the old one to ensure a proper seal.
What are signs that this gasket needs replacement?
Coolant leaks around the water pump area, overheating engine, reduced water flow from the telltale, or visible deterioration of the gasket material indicate replacement is needed. If you're rebuilding the water pump, always replace the gasket regardless of its appearance.
Can I reuse the old gasket if it looks intact?
No, always install a new gasket when servicing the water pump. Gaskets compress and conform to mating surfaces during use, and reusing them can result in leaks and improper sealing, leading to cooling system failure.
Do I need gasket sealant with this part?
Most installations do not require additional sealant when using a quality replacement gasket. Check your service manual for specific recommendations. If sealant is recommended, use a marine-grade, non-hardening formula compatible with your engine.
Will this fit my specific year and model?
Cross-reference your engine's serial number and existing part number against the compatibility table above. If your model and year match and the OEM number is 663-44324-A0, this gasket will fit correctly.
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 against 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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
