Water Pump Impeller – Fits Yamaha 40HP Outboard Motors (Replaces 6F5-44352-00)
Water Pump Impeller – Fits Yamaha 40HP Outboard Motors (Replaces 6F5-44352-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Yamaha 40HP Outboard Motors (Replaces 6F...
Product Details
This aftermarket Water Pump Impeller – Fits Yamaha 40HP Outboard Motors (Replaces 6F5-44352-00) is designed for specific Yamaha 2-Stroke 40HP outboard motors manufactured between 1990 and 1997. It serves as a crucial component for maintaining proper engine cooling by circulating water through the powerhead.
It provides a direct replacement for Sierra part number 18-3088 and Yamaha part numbers 6F5-44352-00, 6F5-44352-01, 6F5-44352-03, and 676-44352-00.
- Engineered for direct OEM replacement fitment.
- Constructed from a durable rubber/neoprene compound for longevity.
- Features a 6-blade design with a plastic hub for reliable performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Sierra | 18-3088 |
| Yamaha | 6F5-44352-00 |
| Yamaha | 6F5-44352-01 |
| Yamaha | 6F5-44352-03 |
| Yamaha | 676-44352-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller is compatible with the following Yamaha 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | C40 | 40 | 2-Stroke | 1991–1997 | 6F5-44352-00 |
| Yamaha | C40ELRP | 40 | 2-Stroke | 1991 | 6F5-44352-00 |
| Yamaha | C40ELRQ, C40MSHQ, C40PLRQ | 40 | 2-Stroke | 1992 | 6F5-44352-00 |
| Yamaha | C40ELRR, C40MSHR, C40PLRR | 40 | 2-Stroke | 1993 | 6F5-44352-00 |
| Yamaha | C40ELRS, C40MSHS, C40MLHS, C40PLRS | 40 | 2-Stroke | 1994 | 6F5-44352-00 |
| Yamaha | C40ELRT, C40MSHT, C40MLHT, C40PLRT | 40 | 2-Stroke | 1995 | 6F5-44352-00 |
| Yamaha | C40ELRU, C40MSHU, C40PLRU | 40 | 2-Stroke | 1996 | 6F5-44352-00 |
| Yamaha | C40ELRV, C40MSHV, C40ESHV, C40PLRV | 40 | 2-Stroke | 1997 | 6F5-44352-00 |
| Yamaha | CV40 | 40 | 2-Stroke | 1990 | 6F5-44352-00 |
| Yamaha | CV40ELD | 40 | 2-Stroke | 1990 | 6F5-44352-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM Replacement
- Housing Material
- Rubber/Neoprene
- Height
- 22.12mm
- External Diameter
- 69.97mm
- Internal Shaft Diameter
- 16.24mm
- Number of Blades
- 6
- Other Technical Attributes
- Plastic Hub
What’s in the Box
- 1 x Water Pump Impeller (Replaces 6F5-44352-00)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unbolting it from the midsection.
- Locate and unbolt the water pump housing cover.
- Slide the old impeller off the driveshaft, noting the blade orientation.
- Clean the housing and install the new impeller, turning the driveshaft clockwise to set the blades correctly.
- Reassemble the housing with new gaskets (if needed) and reinstall the lower unit.
- Reconnect the battery and test the engine on a water supply, ensuring a strong stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if my water pump impeller needs replacing?
Common signs of a failing impeller include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alerts, or visible damage like cracks, tears, or brittleness on the impeller blades during inspection.
What is the recommended replacement interval for this impeller?
For optimal reliability and to prevent engine damage, it is recommended to replace the impeller every one to two years, or every 100-200 hours of operation, especially if operating in saltwater or silty conditions.
Will this impeller fit a 4-stroke Yamaha 40HP engine?
No. This part is specifically designed for the 2-stroke Yamaha 40HP engine models listed in the compatibility chart. It will not fit 4-stroke models.
Is any grease required for installation?
Yes, applying a light coat of marine-grade grease or a soapy water solution to the inside of the pump housing and on the impeller blades will ease installation and provide initial lubrication.
What’s the difference between this and an OEM impeller?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials for fit and function. It is manufactured in an ISO 9002 facility and batch-inspected for quality and consistency.
How fast do you ship and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most regions, with expedited options available at checkout where applicable.
What is the warranty and return policy?
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 before purchase. If anything differs—even if your model appears compatible—do not proceed with the purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — Our model ensures fair pricing without compromising on high-quality materials or stringent quality control.
Payment & Security
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