Water Pump Gasket for Yamaha Outboards – Replaces OEM 663-44315-A0
Water Pump Gasket for Yamaha Outboards – Replaces OEM 663-44315-A0 is backordered and will ship as soon as it is back in stock.
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Water Pump Gasket for Yamaha Outboards – Replaces OEM 663-44315-A0
Water Pump Gasket for Yamaha Outboards – Replaces OEM 663-44315-A0 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Gasket is an aftermarket replacement gasket for the Yamaha outboard water-pump assembly. It is designed to seal the mating surfaces of the water-pump components and help maintain proper cooling-water circulation when the gasket is correctly installed on a matching application.
This gasket replaces Yamaha OEM part number 663-44315-A0. The product is supplied as a single gasket, not as a complete water-pump repair kit.
- Water-pump gasket for Yamaha outboard applications
- Helps seal the water-pump assembly and reduce the risk of cooling-water leakage
- Suitable for replacement during water-pump service when the original gasket is removed
- Confirm the OEM number, gasket profile, engine model, year, and serial number before ordering
Part Number Matrix
Use the following manufacturer reference to compare the replacement gasket with your original part.
| Brand | Manufacturer Part Number |
|---|---|
| Yamaha | 663-44315-A0 |
Engine & Model Compatibility
The available product record identifies this item as a Yamaha water-pump gasket associated with OEM number 663-44315-A0, but it does not provide a complete engine-model, year, stroke, shaft, or serial-number application list. Yamaha fitment can vary by model and production range. Verify the complete engine identification and compare the original gasket before purchase.
| Brand | Application | Engine Details | Fitment Requirement | OEM Part No. |
|---|---|---|---|---|
| Yamaha | Outboard water-pump assembly | Model, year, stroke, shaft, and serial range must be confirmed | Match the original gasket and verify the engine service information | 663-44315-A0 |
Technical Specs
- Product Type
- Water pump gasket
- Application
- Yamaha outboard water-pump assembly
- OEM Interchange
- 663-44315-A0
- Quantity
- 1 gasket
- Product Status
- Aftermarket replacement; not an OEM-branded component
What's in the Box
- 1 × Water Pump Gasket
Installation Notes
- Follow the engine manufacturer's service procedure and make sure the engine is stopped, cool, and safely supported before beginning work.
- Remove the lower unit and water-pump components as directed by the service manual.
- Remove the old gasket carefully and clean the mating surfaces of debris, corrosion, and old sealant without damaging the sealing surfaces.
- Compare the new gasket with the removed gasket and confirm that bolt holes and water passages align before installation.
- Install the gasket in the correct position on the water-pump assembly. Use sealant only where specifically required by the engine service manual.
- Inspect the impeller, wear plate, pump housing, key, and related components for wear or damage. Replace damaged components as needed; they are not included with this gasket.
- Reassemble the water pump and lower unit using the manufacturer's specified torque values and tightening sequence.
- Run the engine only with an appropriate water supply and check for proper cooling-water flow and leaks after service.
Troubleshooting & FAQ
When should I replace the water-pump gasket?
Replace the gasket whenever the water-pump assembly is opened and the original gasket has been removed. A new gasket helps restore the intended seal between the mating surfaces during water-pump service.
Can I reuse the old gasket?
Reusing a removed gasket is not recommended. A gasket may compress, harden, tear, or retain damage from removal, which can lead to leakage or reduced cooling-water performance.
Is this a complete water-pump kit?
No. This listing is for one water-pump gasket only. An impeller, key, housing, wear plate, fasteners, and other service components are not included unless separately stated.
Does this gasket fit every Yamaha outboard?
No. Yamaha water-pump gaskets differ by engine model and production range. Confirm OEM number 663-44315-A0, compare the original gasket, and verify the complete model and serial information before ordering.
Do I need sealant with this gasket?
Use only the sealant and installation method specified for your engine. Do not apply sealant to water passages or gasket surfaces unless the service manual calls for it.
What can cause a water-pump gasket to leak?
Common causes include an incorrect gasket, damaged or corroded mating surfaces, incorrect installation position, excessive or insufficient bolt torque, and sealant applied in the wrong location.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement gasket that references Yamaha OEM part number 663-44315-A0 for identification and fitment comparison.
Safety & Important Info
- Verify the OEM number, gasket shape, engine model, year, and serial range before ordering.
- Do not operate an outboard without an adequate water supply.
- Follow the engine service manual for disassembly, sealant use, torque values, and testing.
- Professional installation is recommended when the correct service procedure is uncertain.
About Sea Sierra
- Marine replacement parts selected for practical service and repair applications.
- Clear OEM-reference information to help customers compare replacement components.
- Support-focused fulfillment for marine maintenance needs.
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