Water Pump Impeller with Key for Yamaha 3HP 3A/Malta and F2.5 Outboards – Replaces 6L5-44352-00, 18-8911
Water Pump Impeller with Key for Yamaha 3HP 3A/Malta and F2.5 Outboards – Replaces 6L5-44352-00, 18-8911 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller with Key for Yamaha 3HP 3A/Malta and F2.5 Outbo...
Water Pump Impeller with Key for Yamaha 3HP 3A/Malta and F2.5 Outboards – Replaces 6L5-44352-00, 18-8911 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller with key is intended for selected Yamaha outboard applications, including Yamaha 3HP 3A/Malta models and F2.5 outboards. It replaces the Yamaha reference 6L5-44352-00 and the Sierra aftermarket reference 18-8911.
The impeller is a service part for the outboard cooling system. It is installed in the water pump and helps circulate cooling water through the engine. Always compare the original impeller, keyway and water-pump assembly before ordering.
- Aftermarket water pump impeller supplied with one matching key.
- Designed for selected Yamaha 3HP 3A/Malta and F2.5 applications.
- Suitable for routine water-pump maintenance when the original part number and application match.
- Not an original Yamaha-branded part.
Part Number References
Use the following references to compare your existing component. A reference number alone does not replace confirmation of the complete engine model and year.
| Brand or source | Reference | Reference type |
|---|---|---|
| Yamaha | 6L5-44352-00 | OEM reference |
| Yamaha | 6L5-44352-00-00 | OEM reference format used in catalog applications |
| Sierra | 18-8911 | Aftermarket reference |
Engine Compatibility
The company application records identify this impeller with key for the following Yamaha applications. Model, horsepower, stroke type and year must be checked together against the engine identification label or service documentation.
| Brand | Model or application | Rated horsepower | Stroke or application note | Recorded year range | OEM reference |
|---|---|---|---|---|---|
| Yamaha Outboard | 3A / Malta | 3 HP | Two-stroke application record | 1988–2002 | 6L5-44352-00 |
| Yamaha Outboard | F2.5 | 2.5 HP | Application recorded for F2.5 | 2003–2012 | 6L5-44352-00 |
| Yamaha Outboard | F2.5A / F2.5B | 2.5 HP | Four-stroke application record | Confirm the exact model year | 6L5-44352-00-00 |
Fitment is limited to the applications represented by these records. Do not assume compatibility with other Yamaha, Parsun or similarly rated engines solely because the horsepower is the same.
Technical Information
- Product type
- Aftermarket water pump impeller with key
- Application
- Selected Yamaha 3HP 3A/Malta and F2.5 outboard water-pump systems
- Installation
- Replacement service part; verify the original component and keyway before installation
- Brand status
- Aftermarket replacement, not an original Yamaha part
- Reference numbers
- Yamaha 6L5-44352-00 and 6L5-44352-00-00; Sierra 18-8911
What’s in the Box
- 1 × aftermarket water pump impeller
- 1 × matching key
The water-pump housing, cover, gaskets, wear plates, seals, bolts and other service components are not included unless separately stated.
Installation Notes
- Confirm the engine model, year, stroke type and original part reference before disassembly.
- Disconnect the spark-plug lead and follow the engine manufacturer’s safety procedures.
- Remove the lower unit according to the service manual for your exact model.
- Open the water-pump housing and remove the old impeller and key.
- Clean the shaft, keyway and pump area. Inspect the housing, cover, wear plate, seals and gaskets for damage or excessive wear.
- Install the supplied key and impeller in the correct orientation. Do not force the impeller onto the shaft.
- Reassemble the water pump and lower unit using the correct torque specifications and any required new seals or gaskets.
- Test the engine in water and confirm a steady cooling-water discharge before normal operation.
Professional installation is recommended if you are not experienced with outboard lower-unit and water-pump service.
Troubleshooting & FAQ
How do I confirm fitment?
Check the complete engine model, horsepower, stroke type and year, then compare the original impeller and OEM reference with the compatibility table. The Yamaha reference 6L5-44352-00 or the Sierra reference 18-8911 should match your application. Contact support with the model and serial information if the application is unclear.
What are the signs of a worn impeller?
Common symptoms include weak or absent tell-tale water flow, overheating, cooling-water alarms and visible cracking, brittleness or deformation of the old impeller.
Does the product include the key?
Yes. This product is supplied as one impeller with one matching key. It is not a complete water-pump repair kit.
Does it include a water-pump housing or gasket set?
No. The package contains the impeller and key only. Inspect and replace other water-pump components separately as required by the service manual.
Can it be used in saltwater?
The impeller is used in outboard cooling systems, but operating conditions affect service life. Flush the cooling system with fresh water after saltwater use and inspect the impeller regularly.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement that references Yamaha 6L5-44352-00 and Sierra 18-8911 for identification and application comparison.
Safety & Important Information
- Verify the exact engine model, year, stroke type and part reference before purchase.
- Do not operate the engine without an adequate cooling-water supply.
- Replace damaged gaskets, seals, wear plates or pump-housing components as required.
- Follow the manufacturer’s service manual for lower-unit removal, torque values and reassembly.
- This listing is for an aftermarket impeller with key, not a complete water-pump kit.
About Sea Sierra
- Marine replacement parts — We supply aftermarket components for routine boat and outboard maintenance.
- Application-focused listings — Product references and fitment details are provided to support accurate part comparison.
- Customer support — When fitment is uncertain, provide the engine model, year and serial information before ordering.
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