Honda 4-Stroke Water Pump Impeller for 20–30 HP Outboards – Replaces 19210-ZV7-003
Honda 4-Stroke Water Pump Impeller for 20–30 HP Outboards – Replaces 19210-ZV7-003 is backordered and will ship as soon as it is back in stock.
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Honda 4-Stroke Water Pump Impeller for 20–30 HP Outboards – Replace...
Honda 4-Stroke Water Pump Impeller for 20–30 HP Outboards – Replaces 19210-ZV7-003 is backordered and will ship as soon as it is back in stock.
Product Details
This is a high-quality aftermarket water pump impeller for selected Honda Marine 4-stroke outboards in the 20–30 HP range. It is supplied as a single impeller and is intended to restore water-pump circulation for reliable engine cooling.
The primary Honda OEM reference for this impeller is 19210-ZV7-003. Honda parts-catalog occurrences identify this impeller for the BF25 and BF30 4-stroke outboard water-pump assemblies. The company fitment record specifies Honda 20, 25, and 30 HP applications; always match the complete engine model and serial information before ordering.
- Product type: Water pump impeller
- Fitment range: Selected Honda Marine 4-stroke outboards rated 20, 25, or 30 HP
- Replacement reference: Honda 19210-ZV7-003
- Package type: Single impeller; no drive key, gaskets, wear plate, or pump housing included
- Installation: Replacement water-pump component requiring removal of the lower unit and pump housing
Part Number Matrix
Use the references below when comparing the old impeller or searching parts catalogs. These references identify the intended application and should not be treated as confirmation for every Honda model without checking the model details.
| Brand or source | Part number | Reference type | Notes |
|---|---|---|---|
| Honda | 19210-ZV7-003 | OEM reference | Primary reference for this impeller |
| Sierra Marine | 18-3281 | Aftermarket reference | Reference listed in the company product record |
| Mallory Marine | 9-45105 | Aftermarket reference | Reference listed in the company product record |
Engine & Model Compatibility
This impeller is intended for selected Honda Marine 4-stroke outboards rated 20, 25, and 30 HP. The company fitment record provides the horsepower range, while catalog evidence specifically identifies the OEM reference in BF25 and BF30 water-pump diagrams.
Honda model suffixes, production years, shaft configurations, and serial-number ranges can affect fitment. Confirm the complete model designation and compare the original impeller before installation.
| Brand | Model or rating | Rated HP | Stroke | OEM reference | Fitment note |
|---|---|---|---|---|---|
| Honda Marine | Selected 20 HP outboards | 20 | 4-Stroke | 19210-ZV7-003 | Company-listed horsepower application; verify the complete model |
| Honda | BF25 | 25 | 4-Stroke | 19210-ZV7-003 | Catalog-listed water-pump impeller application |
| Honda | BF30 | 30 | 4-Stroke | 19210-ZV7-003 | Catalog-listed water-pump impeller application |
Technical Specs
- Product type
- Water pump impeller
- Application
- Selected Honda Marine 4-stroke outboards rated 20–30 HP
- Primary OEM reference
- 19210-ZV7-003
- Construction
- Flexible marine water-pump impeller material; exact compound and internal construction are not specified in the company record
- Installation
- Replacement component for the water-pump assembly
- Package quantity
- 1 impeller
What’s in the Box
- 1 × aftermarket water pump impeller
Not included: Drive key, gaskets, wear plate, pump housing, lower-unit hardware, or other water-pump service parts.
Installation Notes
- Disconnect the battery and remove the engine cowling.
- Follow the engine service manual when removing the lower unit. Depending on the model, this may require disconnecting shift linkage or other connections.
- Remove the water-pump housing and record the order and orientation of the gaskets, wear plate, and related components.
- Remove the old impeller and retain the original drive key if it is in serviceable condition.
- Clean the pump housing and inspect the housing, wear plate, gaskets, and drive key for scoring, distortion, corrosion, or wear. Replace damaged parts as needed.
- Install the drive key and slide the new impeller onto the driveshaft. The drive key is not included with this product.
- Use a suitable lubricant recommended by the engine manufacturer, such as clean soapy water or marine-safe assembly lubricant, to help prevent dry start-up damage.
- Rotate the driveshaft in the correct direction while seating the pump housing so the impeller vanes fold correctly. Confirm the direction in the service manual for your engine.
- Reassemble the pump with appropriate gaskets and tighten fasteners to the manufacturer's specified torque.
- Reinstall the lower unit and reconnect all linkages and hoses according to the service manual.
- Test the engine in water or with the correct flushing equipment. Confirm a strong, steady cooling-water discharge and monitor the engine for overheating.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
Confirm that your Honda outboard is a 4-stroke model rated 20, 25, or 30 HP and that the complete model information corresponds with the Honda OEM reference 19210-ZV7-003. BF25 and BF30 water-pump catalog applications are documented for this reference. Because model suffixes and production details can vary, compare the old impeller and verify the complete model before ordering.
What are the signs of a failing impeller?
Common signs include a weak or absent tell-tale stream, an overheating warning, steam from the exhaust, or abnormal engine temperature. Stop the engine and inspect the cooling system if any of these symptoms occur.
How often should I replace the impeller?
Impeller life depends on operating hours, water conditions, storage, and whether the engine has been run dry. Inspect it during scheduled water-pump service and replace it whenever the vanes are cracked, stiff, permanently deformed, damaged, or worn. Follow the maintenance interval in your engine service manual.
Is the metal drive key included?
No. This listing is for one impeller only. The drive key must be reused if serviceable or purchased separately if it is missing or worn.
Is this an OEM part?
No. This is an aftermarket replacement impeller intended for applications using Honda OEM reference 19210-ZV7-003. Honda and other brand names and part numbers are used only to identify compatibility references.
Do I need a complete water-pump kit?
No complete kit is included. If the pump housing, wear plate, gaskets, or drive key show damage or wear, obtain the necessary service parts separately before beginning installation.
Safety & Important Information
- Verify the complete engine model, horsepower, and applicable parts reference before purchase.
- Do not operate an outboard with an unknown or inadequate cooling-water supply.
- Inspect the entire water-pump assembly during installation; a new impeller cannot correct damage to the housing, wear plate, gaskets, or drive key.
- Professional installation is recommended if you are not familiar with lower-unit removal and water-pump service.
- This is an aftermarket replacement, not an OEM Honda component.
About Sea Sierra
- Marine replacement parts — We supply practical aftermarket components for routine maintenance and repair.
- Fitment-focused information — Product references and application details are provided to help customers compare their engine and original part.
- Support for installation planning — Check the service manual and prepare any additional water-pump service parts before beginning the repair.
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