Water Pump Impeller – Fits Yamaha 40HP Outboard Engines (Replaces 6F5-44352-01, 676-44352-00)
Water Pump Impeller – Fits Yamaha 40HP Outboard Engines (Replaces 6F5-44352-01, 676-44352-00) 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 – Fits Yamaha 40HP Outboard Engines (Replaces 6...
Water Pump Impeller – Fits Yamaha 40HP Outboard Engines (Replaces 6F5-44352-01, 676-44352-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Yamaha 40HP Outboard Engines (Replaces 6F5-44352-01, 676-44352-00) is designed for a precise fit on Yamaha 2-Stroke C40 and CV40 outboard engines manufactured from the 1990s through 2005. It ensures reliable cooling performance to protect your engine from overheating during operation.
This part serves as a direct replacement for several OEM and aftermarket part numbers, including Yamaha 6F5-44352-01 and 676-44352-00, Sierra 18-3088, and Mercury/Mariner 47-99971M.
- Engineered for direct replacement installation.
- Constructed from high-quality neoprene rubber for durability and longevity.
- Features an integrated keyway to ensure a secure fit on the driveshaft.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6F5-44352-01 |
| Yamaha | 676-44352-00 |
| Sierra | 18-3088 |
| Mercury/Mariner | 47-99971M |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
Fits select Yamaha C40 and CV40 outboard models. Compatibility with Mercury/Mariner and Parsun/Makara models is referenced by cross-reference parts, but specific models are not confirmed.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Yamaha | C40 | 40 | 2-Stroke | 6F5-44352-01, 676-44352-00 |
| Yamaha | CV40 | 40 | 2-Stroke | 6F5-44352-01, 676-44352-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Material
- Neoprene rubber
- Keyway
- Yes
What’s in the Box
- 1 x Water Pump Impeller (Replaces 6F5-44352-01 / 676-44352-00)
Installation Notes
- Disconnect the negative battery cable for safety.
- Shift the outboard into neutral.
- Remove the bolts securing the lower unit (gearcase) to the engine.
- Carefully lower and separate the gearcase from the drive shaft housing.
- Unscrew the bolts on the water pump housing cover and remove it.
- Note the direction of the old impeller's blades before removing it from the shaft.
- Clean any debris from the housing and wear plate.
- Slide the new impeller onto the driveshaft, turning the shaft in its normal rotational direction to bend the blades correctly. A small amount of dish soap can aid insertion.
- Reinstall the water pump housing, ensuring a good seal.
- Reattach the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Securely fasten all bolts and reconnect the battery.
- Test the engine with a water supply to confirm proper water pump operation.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
The best way to confirm fitment is by matching your existing part number to one of the cross-references listed in our Part Number Matrix (Yamaha 6F5-44352-01, Sierra 18-3088, etc.). Also, verify your engine model and year against the compatibility table. If in doubt, do not purchase.
What are common signs of a failing water pump impeller?
A weak or non-existent "telltale" stream of water from the engine, engine overheating alarms, and a dry, brittle, or cracked appearance on the old impeller upon inspection are all strong indicators that a replacement is needed.
How often should I replace my outboard's impeller?
As a general maintenance rule, it is recommended to inspect your impeller annually and replace it every 1-2 years, or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).
Is there a video guide for this installation?
While we do not produce installation videos, many independent tutorials are available online that demonstrate the general process. This YouTube video shows an impeller replacement on a compatible Yamaha 40HP motor and may be a helpful reference.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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