Water Pump Impeller for Yamaha C40 40HP 2-Stroke Outboard – Replaces 6F5-44352-00-00, 676-44352-01-00
Water Pump Impeller for Yamaha C40 40HP 2-Stroke Outboard – Replaces 6F5-44352-00-00, 676-44352-01-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller for Yamaha C40 40HP 2-Stroke Outboard – Replace...
Water Pump Impeller for Yamaha C40 40HP 2-Stroke Outboard – Replaces 6F5-44352-00-00, 676-44352-01-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is intended for Yamaha C40 40HP 2-stroke outboard applications. It is supplied as a single replacement impeller for restoring water-pump circulation and helping maintain proper engine cooling.
The company product record lists Yamaha reference numbers 6F5-44352-00-00 and 676-44352-01-00, with Sierra Marine reference 18-3088 and Mallory Marine reference 9-45606. Always compare the part number and engine model before ordering.
- Single replacement water pump impeller.
- Designed for the Yamaha C40 40HP 2-stroke outboard fitment recorded for this product.
- Replacement component for worn, cracked, brittle, or damaged impellers.
- Use the existing water-pump hardware and related components unless replacement parts are separately required.
Part Number Matrix
The following references are listed for identification and cross-reference purposes. They do not expand the confirmed engine fitment beyond the Yamaha C40 application stated above.
| Brand or Reference | Part Number |
|---|---|
| Yamaha | 6F5-44352-00-00 |
| Yamaha | 676-44352-01-00 |
| Sierra Marine | 18-3088 |
| Mallory Marine | 9-45606 |
| Mercury Marine reference listed by the company | 99971M |
Engine & Model Compatibility
Confirm the complete model designation and the part number from your original impeller before purchase. Catalog records identify the impeller reference with Yamaha 40HP 2-stroke C40 and CV40-family catalog entries, while the company fitment record specifically identifies C40. The confirmed company fitment for this listing is shown below.
| Brand | Model | Rated HP | Stroke | Listed Reference |
|---|---|---|---|---|
| Yamaha | C40 | 40 | 2-Stroke | 6F5-44352-00-00; 676-44352-01-00 |
Do not assume fitment for other Yamaha models, Mercury/Mariner models, or other brands solely because a similar cross-reference number appears in a catalog.
Technical Specs
- Product Type
- Water pump impeller
- Product Configuration
- Single impeller, not a complete water-pump kit
- Application
- Yamaha C40 40HP 2-stroke outboard
- OEM References
- 6F5-44352-00-00; 676-44352-01-00
- Aftermarket References
- Sierra Marine 18-3088; Mallory Marine 9-45606
What’s in the Box
- 1 x Water pump impeller
No key, gasket, housing, wear plate, bolts, or complete water-pump assembly is included unless separately stated in the order details.
Installation Notes
- Review the service information for your exact Yamaha outboard model before beginning work.
- Disconnect the battery and secure the engine according to the manufacturer’s safety procedure.
- Shift the outboard into neutral and remove the lower unit according to the service manual.
- Remove the water-pump housing cover and carefully take out the old impeller.
- Inspect the housing, wear plate, drive key, and related seals or gaskets. Replace damaged or worn components as needed; these parts are not included with this listing.
- Install the new impeller in the same orientation as the removed part. Rotate the driveshaft in its normal direction while fitting the housing so the blades seat correctly.
- Reinstall the water-pump housing and lower unit, ensuring that the driveshaft, shift shaft, and water tube are properly aligned.
- Fasten all hardware to the manufacturer’s specifications and reconnect the battery.
- Run the engine only with an appropriate water supply and confirm a strong cooling-water telltale before normal operation.
Troubleshooting & FAQ
How do I confirm that this impeller fits my engine?
Match your engine to the confirmed Yamaha C40 40HP 2-stroke application and compare your existing impeller with the listed references: 6F5-44352-00-00, 676-44352-01-00, Sierra 18-3088, or Mallory 9-45606. Check the full model designation and service information before ordering.
What are common signs of a failing water-pump impeller?
Common signs include a weak or missing cooling-water telltale, overheating warnings, reduced cooling performance, and visible cracking, brittleness, distortion, or missing blades when the old impeller is inspected.
How often should an outboard impeller be replaced?
Inspect the impeller during regular maintenance and replace it when it shows wear or damage. Replacement intervals depend on operating hours, storage conditions, water quality, and the manufacturer’s maintenance schedule.
Does this listing include a complete water-pump kit?
No. This listing is for one impeller only. It does not include a housing, key, gaskets, wear plate, bolts, seals, or other water-pump components.
Is this an OEM part?
No. This is an aftermarket replacement impeller. Yamaha, Sierra Marine, Mallory Marine, and Mercury Marine names and numbers are used only to identify the listed application or reference numbers.
Can this impeller be used on another brand or model?
Do not rely on a number alone to establish fitment for another brand or model. Confirm the complete engine model, stroke, year or serial conditions where applicable, and the original impeller number before purchase.
Safety & Important Information
- Verify the engine model, stroke, and original part number before ordering.
- Do not operate an outboard without an adequate water supply.
- Stop operation immediately if the engine overheats or the cooling-water telltale is weak or absent.
- Professional installation is recommended if you are unfamiliar with lower-unit or water-pump service.
- This listing is for an aftermarket replacement component and is not manufactured by Yamaha.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for routine repair and maintenance applications.
- Application-Focused Listings — Product references and fitment information are provided to help customers compare their original parts.
- Support for Selection — Check the complete engine identification and part number before ordering to reduce the risk of an incorrect fit.
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