Water Pump Impeller – Fits Yamaha 20-25HP Outboards (Replaces 6L2-44352-00)
Water Pump Impeller – Fits Yamaha 20-25HP Outboards (Replaces 6L2-44352-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller – Fits Yamaha 20-25HP Outboards (Replaces 6L2-4...
Water Pump Impeller – Fits Yamaha 20-25HP Outboards (Replaces 6L2-44352-00) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Water Pump Impeller is designed for select Yamaha 20HP and 25HP outboards. It is a critical component for maintaining proper engine cooling, fitting specific 2-stroke models from 1988–2010 and 4-stroke F25 models from 2016 and newer. Built to OEM specifications, it ensures reliable performance and longevity.
This part serves as a direct replacement for Sierra 18-3065, GLM 89622, CEF 500317, and Mallory/OMC 9-45613, providing a cost-effective alternative to OEM components without sacrificing quality.
- Installation requires disassembly of the lower unit to access the water pump housing.
- Constructed from durable, high-quality rubber for optimal flexibility and service life.
- This package includes the impeller only; complete service kits are sold separately.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6L2-44352-00 |
| Sierra | 18-3065 |
| GLM | 89622 |
| CEF | 500317 |
| OMC | 9-45613 |
| Mallory | 9-45613 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please verify your engine's model and manufacturing year range to ensure compatibility. This impeller fits both 2-stroke and specific later-model 4-stroke engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 20HP | 20 | 2-Stroke | 1996–1997 | 6L2-44352-00 |
| Yamaha | 25HP | 25 | 2-Stroke | 1988–2010 | 6L2-44352-00 |
| Yamaha | F25 | 25 | 4-Stroke | 2016–Up | 6L2-44352-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement requiring lower unit disassembly
- Housing Material
- Rubber
- Housing Color
- Black
What’s in the Box
- 1 x Impeller (6L2-44352-00)
Note: Complete water pump service kits (containing the impeller, gaskets, plates, and hardware) are available separately under Yamaha part number 6L2-W0078-00.
Installation Notes
- Disconnect the battery and remove the spark plug leads for safety.
- Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.
- Remove the bolts securing the lower unit (gearcase) to the midsection and carefully lower it.
- Locate and unbolt the water pump housing cover.
- Slide the old impeller off the driveshaft, noting the orientation of the keyway.
- Clean the inside of the pump housing and inspect it for wear, scoring, or corrosion.
- Install the new impeller, aligning its keyway with the key on the driveshaft. You may need to rotate the shaft to seat the vanes correctly.
- Re-install the water pump housing and torque the bolts to manufacturer specifications.
- Re-attach the lower unit to the engine, ensuring the driveshaft and shift shaft align properly.
- Refill the gearcase with the specified marine gear oil before starting the engine.
Troubleshooting & FAQ
How do I confirm this impeller fits my specific Yamaha outboard?
Check your engine’s model, horsepower, and year against the "Engine & Model Compatibility" table. The most reliable method is to cross-reference your existing impeller’s part number (stamped on the part) with the OEM part number 6L2-44352-00 listed.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or intermittent water stream from the "telltale" outlet, engine overheating alerts, and steam from the exhaust. A dry, cracked, or brittle impeller found during inspection is a clear sign it needs immediate replacement.
How often should I replace my outboard's impeller?
As a general maintenance guideline, impellers should be inspected annually and replaced every 1-2 years, or every 100-200 hours of use, depending on operating conditions. Operation in sandy or silty water may require more frequent changes.
Is there a difference in performance between this and the OEM part?
This aftermarket impeller is engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, material durability, and cooling performance. When installed correctly, its performance is comparable to the OEM part.
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.
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