Water Pump Impeller for Yamaha 2-Stroke and 4-Stroke Outboards – Replaces 6H4-44352-00, 6H4-44352-01 and 6H4-44352-02
Water Pump Impeller for Yamaha 2-Stroke and 4-Stroke Outboards – Replaces 6H4-44352-00, 6H4-44352-01 and 6H4-44352-02 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 for Yamaha 2-Stroke and 4-Stroke Outboards – Re...
Water Pump Impeller for Yamaha 2-Stroke and 4-Stroke Outboards – Replaces 6H4-44352-00, 6H4-44352-01 and 6H4-44352-02 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement water pump impeller is listed for selected Yamaha outboards with both 2-stroke and 4-stroke configurations. It is supplied as a single impeller for replacing a worn or damaged water-pump impeller and helping restore the cooling-water flow required for normal engine operation.
The impeller is listed for Yamaha OEM references 6H4-44352-00-00, 6H4-44352-01-00, and 6H4-44352-02-00. Related aftermarket references listed for this product include Sierra 18-3068 and Mallory 9-45601.
- Replacement water pump impeller for selected Yamaha outboards.
- Applicable fitment is separated by engine model and stroke type below.
- Impeller only; the installation key is not included.
- Confirm the complete engine model and existing impeller before ordering.
Part Number Matrix
Use the following references to compare the impeller with your original part. Part-number listings are reference identifiers and should be checked against the exact engine model.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 6H4-44352-00-00 | OEM reference |
| Yamaha | 6H4-44352-01-00 | OEM reference |
| Yamaha | 6H4-44352-02-00 | OEM reference |
| Sierra Marine | 18-3068 | Aftermarket reference |
| Mallory Marine | 9-45601 | Aftermarket reference |
Engine & Model Compatibility
The company fitment data lists the following Yamaha model codes. The 2-stroke and 4-stroke applications are kept separate because model and stroke conditions must match your engine exactly.
| Brand | Model Codes | Rated HP Range | Stroke | OEM References |
|---|---|---|---|---|
| Yamaha Outboard | 25B, 25J, 25N, 25Q, 25V, 25XMH, 30D, 30G, 30H, 40H, 40X, 50D | 25–50 HP | 2-Stroke | 6H4-44352-00-00, 6H4-44352-01-00, 6H4-44352-02-00 |
| Yamaha Outboard | F20A, F20D, F25A, FT25B, F25D, FT25F, F30A, F30B, F40B, F40F | 20–40 HP | 4-Stroke | 6H4-44352-00-00, 6H4-44352-01-00, 6H4-44352-02-00 |
Catalog evidence also shows this impeller reference in selected Yamaha 40 HP and 50 HP 2-stroke applications, including model-year examples from 1984–1986. This does not expand the company fitment list; verify the exact model code, year, and serial-number range for your engine before installation.
Technical Specs
- Product Type
- Water pump impeller
- Application
- Selected Yamaha 2-stroke and 4-stroke outboards
- OEM References
- 6H4-44352-00-00, 6H4-44352-01-00, 6H4-44352-02-00
- Aftermarket References
- Sierra 18-3068; Mallory 9-45601
- Installation Key
- Not included; verify the required key against the engine and pump assembly
- Replacement Type
- Aftermarket replacement impeller
What’s in the Box
- 1 x Water pump impeller
Not included: installation key, gaskets, water-pump housing, wear plate, bolts, seals, or other water-pump components.
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Remove the lower unit according to the engine manufacturer’s service procedure.
- Remove the water-pump housing and inspect the housing, wear plate, seals, and related components for wear or damage.
- Remove the old impeller and the existing shaft key. Do not reuse a damaged or distorted key.
- Verify the replacement key and pump components for your exact engine before assembly; the key is not included with this impeller.
- Install the impeller on the driveshaft, aligning the keyway with the shaft key.
- Reinstall the water-pump housing while turning the driveshaft in the correct direction for the engine so the vanes seat properly.
- Reinstall the lower unit, reconnect the battery, and complete any required gearcase-fluid service.
- Run the engine using the manufacturer’s procedure and confirm a strong, consistent tell-tale stream. Stop the engine immediately if the stream is weak or absent.
Troubleshooting & FAQ
How do I confirm compatibility?
Match the complete engine model code and stroke type with the compatibility table. Do not rely only on horsepower. Year and serial-number conditions may also affect fitment, so compare your original impeller and verify the applicable service information before ordering.
What are signs of a worn water pump impeller?
Common signs include overheating, a weak or intermittent tell-tale stream, reduced cooling-water flow, or visible damage to the impeller, pump housing, or wear plate. Continued operation with inadequate cooling can cause serious engine damage.
Does this impeller include the installation key?
No. This listing is for one impeller only. The installation key is not included and must be verified or purchased separately for the exact engine and water-pump assembly.
Can I use the old gasket or water-pump housing?
Inspect all related water-pump components during installation. Replace worn, damaged, hardened, or distorted gaskets, seals, housing parts, or wear plates as required by the engine manufacturer’s service procedure.
Why is the tell-tale stream weak after installation?
Possible causes include incorrect vane orientation, a missing or improperly seated key, a blocked tell-tale outlet or cooling passage, a worn pump housing, damaged seals, or an engine application mismatch. Recheck the installation and confirm the exact model fitment before operating the engine further.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement impeller listed against the Yamaha OEM references shown above. Yamaha, Sierra, and Mallory are referenced only for identification and compatibility purposes.
How often should the impeller be replaced?
Replacement intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the impeller regularly and replace it when the service interval is reached or whenever it shows cracking, hardening, damaged vanes, deformation, or other wear.
Safety & Important Information
- Verify the complete engine model, stroke type, year, and serial-number range before ordering.
- Compare the original impeller, keyway, and pump components with the product required for your engine.
- This product is an aftermarket replacement, not an OEM Yamaha component.
- Use appropriate service information and follow safe procedures when removing or installing the lower unit.
- Do not operate the engine if the cooling-water stream is weak, intermittent, or absent.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for common outboard and marine-system service needs.
- Fitment-Focused Listings — Product references and model information are provided to help you compare the replacement with your original part.
- Support for Installation Planning — Always confirm the complete engine application and required related hardware before beginning service.
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