Water Pump Impeller with Key for Yamaha 4-Stroke 8–20 HP Outboards – Replaces 63V-44352-00-00, 63V-44352-01-00
Water Pump Impeller with Key for Yamaha 4-Stroke 8–20 HP Outboards – Replaces 63V-44352-00-00, 63V-44352-01-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller with Key for Yamaha 4-Stroke 8–20 HP Outboards ...
Water Pump Impeller with Key for Yamaha 4-Stroke 8–20 HP Outboards – Replaces 63V-44352-00-00, 63V-44352-01-00 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller with key is an aftermarket replacement for selected Yamaha 4-stroke outboard cooling systems. It is designed to circulate cooling water through the engine and help maintain proper operating temperature during use.
The company application data identifies this impeller for Yamaha models including FT8D, FT8G, F9.9C, FT9.9D, FT9.9G, F9.9H, FT9.9L, F15A, F15C, F20B, 15FMH1, and 5FMHS. The broader listed application is Yamaha 4-stroke outboards from 5 to 20 HP, including 1984 and later applications. Always compare the original impeller, keyway, dimensions, model designation, and OEM reference before ordering.
- Replacement water pump impeller for selected Yamaha 4-stroke outboards.
- Supplied with one matching impeller key.
- Six-blade design with approximately 53 mm outside diameter, 12.85 mm inside diameter, and 14 mm width.
- Helps restore water-pump circulation when the original impeller is worn, cracked, hardened, or damaged.
- Aftermarket component; not manufactured by Yamaha.
Part Number References
Use the following references to compare the replacement part with your original component. Part-number references alone do not replace confirmation of the exact engine model and application.
| Brand or Supplier | Reference | Reference Type |
|---|---|---|
| Yamaha | 63V-44352-00 | OEM reference |
| Yamaha | 63V-44352-01 | OEM reference |
| Yamaha | 63V-44352-00-00 | OEM reference |
| Yamaha | 63V-44352-01-00 | OEM reference |
| Sierra | 18-3040 | Aftermarket cross-reference |
| GLM | 89619 | Aftermarket cross-reference |
| Mallory | 9-45607 | Aftermarket cross-reference |
| Parsun | ASP500363 | Aftermarket cross-reference |
| Mercury Marine | 8M6014002; 8M6010335 | Additional listed reference; verify application before use |
Yamaha Compatibility
The following model designations are listed in the company product records. Model-year, shaft-length, serial-number, and regional differences may affect fitment, so confirm the complete engine identification and the original part number before installation.
| Brand | Model | Rated HP | Stroke | Application Notes |
|---|---|---|---|---|
| Yamaha | FT8D | 8 | 4-Stroke | Listed application |
| Yamaha | FT8G | 8 | 4-Stroke | Listed application |
| Yamaha | F9.9C | 9.9 | 4-Stroke | Listed application |
| Yamaha | FT9.9D / FT9.9G / FT9.9L | 9.9 | 4-Stroke | Listed applications |
| Yamaha | F9.9H | 9.9 | 4-Stroke | Listed application |
| Yamaha | F15A | 15 | 4-Stroke | Listed application |
| Yamaha | F15C | 15 | 4-Stroke | Listed application |
| Yamaha | F20B | 20 | 4-Stroke | Listed application |
| Yamaha | 15FMH1 / 5FMHS | 15 / not specified | 4-Stroke application record | Verify the exact model plate and original impeller |
Application range: Yamaha 4-stroke outboards from 5 to 20 HP, including 1984 and later applications as listed by the company. The specific model list above should take priority when it applies to your engine.
Technical Specifications
- Product Type
- Water pump impeller with key
- Application
- Selected Yamaha 4-stroke outboard cooling systems
- Blade Count
- 6 blades
- Outside Diameter
- Approximately 53 mm
- Inside Diameter
- Approximately 12.85 mm
- Width
- Approximately 14 mm
- Function
- Circulates cooling water through the outboard water-pump system
- Replacement Type
- Aftermarket replacement for the listed OEM references
What's in the Box
- 1 x Water pump impeller
- 1 x Impeller key
Installation Notes
- Refer to the outboard manufacturer's service procedure for lower-unit removal and water-pump service.
- Turn off the engine, remove the ignition or disconnect the battery as appropriate, place the outboard in neutral, and allow it to cool completely.
- Remove the lower unit and water-pump cover using the correct tools. Keep fasteners and components organized.
- Remove the old impeller and key. Inspect the pump housing, wear surfaces, cover, water tube, and seals for scoring, distortion, blockage, or wear.
- Install the supplied key correctly in the driveshaft keyway and seat the new impeller in the correct orientation for the engine's rotation.
- Use only lubricant and sealants specified by the engine manufacturer. Do not force the impeller or damage its vanes during installation.
- Reassemble the water-pump components and lower unit according to the manufacturer's torque and alignment requirements.
- After installation, run the engine only in an appropriate test environment and confirm a steady tell-tale stream and normal temperature indication.
Maintenance and Troubleshooting
What are common signs of a worn impeller?
A weak or missing tell-tale stream, overheating, reduced water pressure, damaged vanes, cracking, hardening, or deformation can indicate that the impeller requires inspection or replacement. Check the complete cooling system before operating an engine that is overheating.
How often should the impeller be replaced?
Replacement timing depends on the engine manufacturer's service schedule, operating hours, storage conditions, and exposure to salt, sand, or silt. Inspect the impeller at the recommended service interval and replace it whenever the vanes show wear or damage.
Does this product fit every Yamaha 8–20 HP outboard?
No. The listed range is an application guide, not a universal fitment statement. Stroke type, model designation, production year, shaft configuration, serial range, and pump design can affect compatibility. Verify your exact engine and one of the listed part references before ordering.
Is the key included?
Yes. This product is sold with one impeller key. Confirm that the supplied key matches the engine's driveshaft keyway during installation.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement impeller intended for the listed applications and reference numbers. Yamaha and other brand names are used only to identify compatibility and reference parts.
Can I install it myself?
Installation requires lower-unit removal, correct impeller orientation, component inspection, and proper reassembly. It may be performed by an experienced technician using the manufacturer's service information. Professional installation is recommended if you are not familiar with outboard water-pump service.
Safety and Fitment Information
- Confirm the complete engine model, stroke type, year or serial range where applicable, and original impeller dimensions before purchase.
- Do not operate an outboard without a properly functioning cooling-water supply.
- Replace damaged gaskets, seals, or worn pump components as required by the manufacturer's service procedure.
- Stop the engine immediately if the tell-tale stream is weak or absent, or if the engine shows signs of overheating.
- This listing is for the impeller and one key only; the water-pump housing, cover, wear plate, gaskets, and other service parts are not included unless specifically stated above.
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