Water Pump Impeller for Yamaha 40–70 HP Outboards – 2-Stroke and 4-Stroke Models
Water Pump Impeller for Yamaha 40–70 HP Outboards – 2-Stroke and 4-Stroke Models is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller for Yamaha 40–70 HP Outboards – 2-Stroke and 4-...
Water Pump Impeller for Yamaha 40–70 HP Outboards – 2-Stroke and 4-Stroke Models is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is a replacement cooling-system component for selected Yamaha outboard engines. The company catalog identifies this product as a single impeller, not a complete water-pump repair kit. It is listed for selected Yamaha 2-stroke and 4-stroke models, including C-, F-, P-, T-, and E-series applications.
The impeller is designed to circulate cooling water through the outboard water-pump assembly. Replace the impeller when the cooling-water stream is weak or inconsistent, the engine runs hot, or the old vanes show cracking, brittleness, deformation, or wear.
- Replacement water-pump impeller for selected Yamaha outboards.
- Sold as one impeller only.
- Aftermarket replacement, not a Yamaha OEM component.
- Confirm the complete engine model and year range before ordering.
Part Number References
These manufacturer and aftermarket references are listed for identification and cross-reference purposes. Part-number appearance alone does not replace a model-specific fitment check.
| Brand | Reference | Reference Type |
|---|---|---|
| Yamaha | 697-44352-00-00 | OEM reference |
| Yamaha | 6H3-44352-00-00 | OEM reference |
| Sierra Marine | 18-3069 | Aftermarket reference |
| Mallory Marine | 9-45602 | Aftermarket reference |
| Mercury Marine | 47-81423M, 47-97108M | Additional catalog references |
Engine & Model Compatibility
The following applications are taken from the company catalog. Keep horsepower, stroke type, model designation, and stated year range together when checking fitment.
| Brand | Stroke | Model or Series | Rated HP | Year Condition |
|---|---|---|---|---|
| Yamaha | 2-Stroke | C40, 40V, 40Y, P40 | 40 | Catalog-listed application; verify model year |
| Yamaha | 2-Stroke | T50, P50 | 50 | P50: 1997 and later |
| Yamaha | 2-Stroke | C50, 50G, 50H, Pro50 | 50 | Catalog-listed application; verify model year |
| Yamaha | 2-Stroke | 55B, C55 | 55 | C55: 1990–1991 |
| Yamaha | 2-Stroke | T60, P60 | 60 | P60: through 1996 |
| Yamaha | 2-Stroke | E60 | 60 | 1997–2000 |
| Yamaha | 2-Stroke | C60, 60F | 60 | Catalog-listed application; verify model year |
| Yamaha | 2-Stroke | 70B, C70 | 70 | C70: 1997–2003 |
| Yamaha | 4-Stroke | F40A, F40C, F45A | 40–45 | Catalog-listed application; verify model year |
| Yamaha | 4-Stroke | F50A, F50B, F50F, FT50B, FT50C, FT50G | 50 | Catalog-listed application; verify model year |
| Yamaha | 4-Stroke | F60A, F60C, FT60B, FT60D | 60 | Catalog-listed application; verify model year |
| Yamaha | 4-Stroke | F70A | 70 | Catalog-listed application; verify model year |
Technical Specifications
- Product Type
- Outboard water-pump impeller
- Product Configuration
- Single replacement impeller
- Application
- Selected Yamaha 2-stroke and 4-stroke outboard water-pump assemblies
- Aftermarket Status
- Aftermarket replacement; not an OEM component
- Included Hardware
- No gasket, key, wear plate, O-ring, pump housing, or other water-pump components are specified as included
What’s in the Box
- 1 × Water pump impeller
Not included: water-pump housing, gaskets, O-rings, wear plate, impeller key, bolts, or complete repair-kit components unless separately stated in the order details.
Installation Notes
- Confirm the engine model, stroke type, and applicable year range before installation.
- Disconnect the battery and follow the manufacturer’s service procedure for the specific outboard.
- Remove the lower unit and water-pump cover to access the impeller.
- Inspect the pump housing, wear plate, key, seals, and gaskets for damage or wear.
- Remove the old impeller and retain the original key only if it is serviceable and the replacement procedure permits reuse.
- Clean the mating surfaces and remove old gasket material and debris.
- Install the replacement impeller with the key correctly seated. Follow the engine manufacturer’s specified vane direction and shaft-rotation procedure.
- Reassemble the pump cover and lower unit using appropriate serviceable gaskets and hardware.
- Run the engine only in water or with an appropriate flushing device, then confirm a steady cooling-water tell-tale stream.
Troubleshooting & FAQ
How do I know if the impeller needs replacing?
Typical signs include overheating, a weak or intermittent tell-tale stream, reduced cooling-water flow, or impeller vanes that are cracked, brittle, permanently bent, or missing. Inspect the entire water-pump assembly whenever the impeller is replaced.
Does this listing include a key or gasket?
No. The company record identifies this product as a single impeller. A key, gasket, wear plate, O-ring, pump housing, and other repair-kit components are not included unless specifically stated in the order details.
Is this an OEM part?
No. This is an aftermarket replacement impeller. The Yamaha, Sierra Marine, Mallory Marine, and Mercury Marine numbers shown on this page are reference numbers used for identification and fitment comparison.
Can I use the horsepower range alone to confirm fitment?
No. The same horsepower rating can cover different engine families and water-pump configurations. Match the complete model designation, stroke type, and applicable year condition before ordering.
Should the new impeller vanes be curved?
Flexible impeller vanes may appear straight or may take their working shape after installation in the pump housing. Install the impeller according to the service instructions for the specific engine and do not run it dry.
Safety & Important Information
- Verify the complete engine model and year range against the fitment information before purchase.
- Do not operate the engine without an adequate water supply or suitable flushing equipment.
- Inspect the housing, wear plate, key, seals, and gaskets during installation and replace worn components as needed.
- Professional installation is recommended if you are unfamiliar with outboard lower-unit or water-pump service.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine Replacement Parts — Replacement components for common outboard and marine service applications.
- Fitment-Focused Listings — Product references and model information are provided to support part-number and application checks.
- Practical Service Support — Clear product details help customers identify the correct replacement before installation.
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