Water Pump Impeller – Fits Yamaha 8/9.9/15HP 2-Stroke Outboards (Replaces 63V-44352-01)
Water Pump Impeller – Fits Yamaha 8/9.9/15HP 2-Stroke Outboards (Replaces 63V-44352-01) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller – Fits Yamaha 8/9.9/15HP 2-Stroke Outboards (Re...
Water Pump Impeller – Fits Yamaha 8/9.9/15HP 2-Stroke Outboards (Replaces 63V-44352-01) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed to help restore cooling-water circulation in compatible Yamaha outboard water pumps. It is listed for Yamaha 8HP, 9.9HP, and 15HP 2-stroke applications using the 63V impeller pattern.
The impeller is identified against Yamaha OEM references 63V-44352-01 and 63V-44352-00-00. It is also cross-referenced in aftermarket catalogs as Sierra 18-3040. These references are provided for identification; always match the complete engine model, year, serial range, and original impeller before ordering.
- Replacement water-pump impeller for compatible Yamaha outboards.
- Flexible rubber construction for water-pump service.
- High-pressure, short-vane impeller design identified with the 63V reference.
- Sold as one impeller; water-pump housing, gaskets, wear plates, bolts, and keys are not included unless specifically stated.
Part Number Matrix
Use the following references to compare the replacement impeller with your original part and service documentation.
| Brand | Part Number | Reference Type |
|---|---|---|
| Yamaha | 63V-44352-01 | OEM impeller reference |
| Yamaha | 63V-44352-00-00 | OEM catalog reference |
| Sierra | 18-3040 | Aftermarket cross-reference |
Engine & Model Compatibility
Compatibility depends on the exact model designation, year, shaft configuration, and serial range. The catalog evidence supports the following Yamaha 2-stroke examples; it does not confirm every engine sold under the same horsepower rating.
| Brand | Example Model | Rated HP | Stroke | Example Year | OEM Part No. | Fitment Note |
|---|---|---|---|---|---|---|
| Yamaha | 9.9ELHU / 9.9ELRU | 9.9 | 2-Stroke | 1996 | 63V-44352-00-00 | Catalog-listed impeller application |
| Yamaha | 15ELHU / 15ELRU | 15 | 2-Stroke | 1996 | 63V-44352-00-00 | Catalog-listed impeller application |
| Yamaha | 15ESHU / 15MLHU / 15MSHU | 15 | 2-Stroke | 1996 | 63V-44352-00-00 | Catalog-listed impeller application |
| Yamaha | 8HP applications | 8 | 2-Stroke | Application-dependent | 63V-44352-01 | Verify the exact model and serial range |
Important: Do not assume fitment for Yamaha 4-stroke, T9.9, F15/F15C, F20, Parsun, Selva, or other models solely from horsepower. Those applications use different impeller references in the catalog material and require separate confirmation.
Technical Specs
- Product Type
- Water Pump Impeller
- Construction
- Flexible rubber impeller
- Design
- High-pressure, short-vane design
- Approximate Outside Diameter
- 53 mm / 2.125 in
- Approximate Inside Diameter
- 12.85 mm / 0.500 in
- Color
- Black
- Application
- Marine outboard water-pump cooling systems
- Key
- Not included; confirm the required Woodruff key separately before installation
What’s in the Box
- 1 x Water pump impeller
Water-pump housing, cover, gaskets, wear plates, bolts, dowel pins, and drive key are not included.
Installation Notes
- Disconnect the battery and ensure the engine cannot start accidentally.
- Place the outboard in neutral and remove the lower unit according to the engine service manual.
- Remove the water-pump housing cover and carefully take out the old impeller.
- Inspect the housing, wear surfaces, drive key, gaskets, and water-tube connection. Replace worn or damaged parts as required.
- Clean debris from the pump cavity and confirm that the new impeller matches the original diameter, hub, vane style, and key arrangement.
- Install the impeller in the correct rotation direction for the engine. Use the service manual procedure; do not force the vanes against the housing.
- Reassemble the water-pump housing and lower unit with the correct gaskets and fastener torque.
- Run the engine in water or with an appropriate flushing device and verify a normal cooling-water tell-tale stream before operation.
Troubleshooting & FAQ
How do I confirm fitment for my Yamaha outboard?
Check the complete model designation, year, serial range, shaft configuration, and the impeller reference in the engine parts catalog or service manual. The 8HP, 9.9HP, and 15HP ratings alone are not sufficient to confirm fitment.
What are common signs of a worn impeller?
A weak or missing tell-tale stream, overheating, steam from the exhaust, or cooling-water flow that decreases after warm-up can indicate an impeller or related water-pump problem. Inspect the complete pump assembly before replacing only one component.
Is the drive key included?
No. This listing is for one impeller only. The drive key is a separate component and should be inspected or replaced when the impeller is serviced.
Is this a genuine Yamaha OEM part?
No. This is an aftermarket replacement impeller. Yamaha OEM part numbers are shown only as compatibility and identification references.
Does this product include a complete water-pump repair kit?
No. The package contains one impeller. Housing components, gaskets, wear plates, bolts, pins, and keys are not included.
How often should an outboard impeller be replaced?
Replacement timing depends on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the impeller regularly and replace it if the vanes are cracked, hardened, distorted, damaged, or permanently set.
Safety & Important Information
- Verify the original part number and physical dimensions before purchase.
- Keep model, year, horsepower, stroke, shaft, and serial-number conditions together when checking compatibility.
- Do not operate an outboard with inadequate cooling-water flow.
- Follow the engine manufacturer’s service manual for removal, installation, rotation direction, fastener torque, and testing.
- This is an aftermarket replacement component, not an original Yamaha part.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine marine maintenance and repair.
- Clear Part Identification — OEM and aftermarket references are provided to help compare the replacement with your original component.
- Fitment-Conscious Support — Always verify the complete engine model and application before installation.
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