Water Pump Impeller – Fits Yamaha 2.5HP & 3HP Outboards (Replaces 6L5-44352-00-00)
Water Pump Impeller – Fits Yamaha 2.5HP & 3HP Outboards (Replaces 6L5-44352-00-00) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller – Fits Yamaha 2.5HP & 3HP Outboards (Replac...
Water Pump Impeller – Fits Yamaha 2.5HP & 3HP Outboards (Replaces 6L5-44352-00-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Yamaha 2.5HP & 3HP Outboards (Replaces 6L5-44352-00-00) is a direct-fit replacement component for Yamaha 2.5HP 4-Stroke (F2.5A/B) models from 2003–2021 and 3HP 2-Stroke (3A/Malta) models from 1988–2002. It is engineered to restore cooling system efficiency and prevent engine overheating.
It serves as a direct interchange for several aftermarket part numbers, including Sierra 18-8911, Mallory 9-45615, CEF 500322, and KUNOANZ KU-001009.
- Engineered for direct OEM replacement fit and function.
- Made from durable rubber optimized for marine water cooling systems.
- Simple installation requires standard marine tools.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha (OEM) | 6L5-44352-00-00 |
| Sierra | 18-8911 |
| Mallory | 9-45615 |
| CEF | 500322 |
| KUNOANZ | KU-001009 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F2.5A/B | 2.5 | 4-Stroke | 2003–2021 | 6L5-44352-00-00 | Current production |
| Yamaha | 3A | 3 | 2-Stroke | 1988–2002 | 6L5-44352-00-00 | Malta series |
| Yamaha | Malta | 3 | 2-Stroke | 1988–2002 | 6L5-44352-00-00 | Same as 3A model |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Number of Blades
- 6
- Housing Material
- Rubber
- Dimensions
- Ø 35.31-36mm × H 14.32-15mm, Shaft Ø 9.9-10mm
- Weight
- 8g (0.28 oz)
- Other Technical Attributes
- For water cooling system
What’s in the Box
- 1 x Water Pump Impeller (6L5-44352-00-00)
Installation Notes
- For safety, disconnect the battery and shut off the fuel supply.
- Remove the lower unit (gearcase) from the outboard motor.
- Unbolt and carefully lift the water pump housing to expose the old impeller.
- Remove the old impeller from the driveshaft, noting the rotational direction of the blades.
- Clean any debris from the housing, wear plate, and driveshaft. Inspect for deep grooves or damage.
- Lightly lubricate the new impeller and the inside of the housing with marine grease or soapy water.
- Slide the new impeller onto the driveshaft, turning the shaft clockwise to help fold the blades into position.
- Reinstall the water pump housing and torque its bolts to the manufacturer's specification.
- Reattach the lower unit, connect the fuel line, and test the engine in the water, ensuring a steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my Yamaha outboard?
This impeller is specifically for Yamaha 2.5HP 4-Stroke (F2.5A/B, 2003–2021) and 3HP 2-Stroke (3A/Malta, 1988–2002) models. Always cross-reference your engine model and year with the compatibility table and verify your OEM part number is 6L5-44352-00-00.
What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in cooling performance. Brittle or cracked blades on inspection also indicate a need for immediate replacement.
How often should I replace my outboard's impeller?
As a general maintenance rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent changes.
What's the difference between this impeller and the original Yamaha part?
This is an aftermarket component designed to meet or exceed OEM specifications for fit, form, and function. It provides a cost-effective alternative to the original part without compromising on material quality or performance.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- 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 QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
