Water Pump Impeller with Key for Honda Marine 20–30 HP 4-Stroke Outboards – Replaces 19210-ZV7-003
Water Pump Impeller with Key for Honda Marine 20–30 HP 4-Stroke Outboards – Replaces 19210-ZV7-003 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller with Key for Honda Marine 20–30 HP 4-Stroke Out...
Water Pump Impeller with Key for Honda Marine 20–30 HP 4-Stroke Outboards – Replaces 19210-ZV7-003 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller with key is designed for Honda Marine 20 HP, 25 HP, and 30 HP four-stroke outboard applications. It replaces Honda OEM part number 19210-ZV7-003 and is intended to restore water circulation through the outboard cooling system.
The supplied product is a single impeller with a key. It is not a complete water pump assembly or a full water pump service kit. Confirm the engine model, horsepower, stroke, and existing impeller dimensions before installation.
- Application range: Honda Marine 20–30 HP four-stroke outboards.
- Includes one water pump impeller and one matching key.
- For cooling-system water circulation in the outboard lower unit.
- Aftermarket replacement; Honda is referenced only for application and OEM part-number identification.
Part Number Matrix
Use the following references when comparing the replacement part with your existing impeller. Manufacturer and aftermarket reference numbers may identify related configurations, so verify the application and physical dimensions before ordering.
| Brand or Reference | Part Number | Reference Type |
|---|---|---|
| Honda | 19210-ZV7-003 | OEM application reference |
| Sierra Marine | 18-3281 | Aftermarket reference supplied in the company catalog |
| Mallory Marine | 9-45105 | Aftermarket reference supplied in the company catalog |
Engine & Model Compatibility
The company catalog specifies Honda Marine 20 HP, 25 HP, and 30 HP four-stroke outboard applications. The catalog relationships below also identify the OEM reference in Honda BF25 and BF30 water-pump diagrams. Model-year and serial-number coverage can vary, so match the complete engine identification and the original part before installation.
| Brand | Model or Application | Rated HP | Stroke | OEM Part No. | Fitment Notes |
|---|---|---|---|---|---|
| Honda Marine | 20 HP applications | 20 | 4-Stroke | 19210-ZV7-003 | Company-specified horsepower range; confirm the exact model and serial number. |
| Honda | BF25 | 25 | 4-Stroke | 19210-ZV7-003 | Listed in a Honda water-pump catalog occurrence. |
| Honda Marine | 25 HP applications | 25 | 4-Stroke | 19210-ZV7-003 | Company-specified horsepower range; confirm the exact model and serial number. |
| Honda | BF30 | 30 | 4-Stroke | 19210-ZV7-003 | Listed in Honda water-pump catalog occurrences. |
| Honda Marine | 30 HP applications | 30 | 4-Stroke | 19210-ZV7-003 | Company-specified horsepower range; confirm the exact model and serial number. |
Technical Specs
- Product Type
- Marine outboard water pump impeller with key
- Application
- Honda Marine 20–30 HP four-stroke outboards
- Product Configuration
- Single replacement impeller with one key
- Installation
- Replacement for the existing water pump impeller
- Cooling Function
- Circulates water through the outboard cooling system
- OEM Part Number
- 19210-ZV7-003
- Aftermarket References
- Sierra Marine 18-3281; Mallory Marine 9-45105
What’s in the Box
- 1 x Water pump impeller
- 1 x Matching impeller key
No water-pump housing, gasket, wear plate, bolts, or complete service-kit components are included unless separately stated in the order details.
Installation Notes
- Review the engine service information for the correct procedure, safety precautions, and torque specifications for your exact model.
- Place the engine in a stable position and disconnect the battery or ignition power before beginning work.
- Remove the lower unit as required to access the water pump housing.
- Remove the water pump housing and old impeller. Keep track of the original key and inspect the shaft, housing, wear plate, gasket, and related components for damage or excessive wear.
- Clean the housing and mating surfaces. Replace worn or damaged water-pump components before installing the new impeller.
- Install the supplied key securely in the shaft keyway, then install the impeller over the key. Do not force the impeller or allow the key to fall out of alignment.
- Lubricate the impeller with clean water or a lubricant approved by the engine manufacturer. Avoid petroleum products that may damage the impeller material.
- Reinstall the water pump housing, gasket, and lower unit according to the engine manufacturer's instructions. Tighten fasteners to the specified torque.
- Run the engine only in the water or with an appropriate flushing device. Verify a steady tell-tale stream and monitor the engine for overheating.
Troubleshooting & FAQ
How do I confirm that this impeller fits my Honda outboard?
Confirm that your engine is a Honda Marine four-stroke application in the 20–30 HP range, then compare the existing impeller and key with the OEM reference 19210-ZV7-003. Match the exact model and serial-number information in your engine documentation whenever available. Do not rely on horsepower alone if the original part or housing differs.
Does this product include a key?
Yes. The company product specification identifies this item as a water pump impeller with key, and the package contents are one impeller and one matching key.
Is this a complete water pump kit?
No. This listing is for a single impeller with key. It does not include a complete pump housing, gasket set, wear plate, or other service-kit components.
What are common signs of a worn water pump impeller?
A weak or absent tell-tale stream, an overheating warning, rising operating temperature, or visible cracking, brittleness, deformation, or missing impeller blades can indicate that the impeller or another cooling-system component requires service.
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 if it is damaged, deformed, hardened, cracked, or worn. Sandy, silty, and saltwater operation may require more frequent inspection.
Can incorrect installation cause overheating?
Yes. A missing or misaligned key, damaged housing, incorrect impeller orientation, poor gasket sealing, or an improperly reassembled water pump can prevent adequate water circulation and cause overheating.
Is this an OEM Honda component?
No. This is an aftermarket replacement impeller. Honda and the OEM number 19210-ZV7-003 are used to identify the intended application and reference part.
Safety & Important Information
- Verify the exact engine model, horsepower, stroke, and serial-number range before ordering.
- Compare the replacement impeller and key with the original parts before installation.
- Never operate an outboard without an adequate water supply.
- Stop operation immediately if the tell-tale stream is weak or the engine shows signs of overheating.
- Professional installation is recommended when you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for common outboard maintenance and repair applications.
- Application-Focused Listings — Product references and fitment details are provided to help you compare the replacement part with your original component.
- Support for Part Verification — Compare your engine identification and existing part before installation to help ensure the correct replacement.
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