Water Pump Impeller for Honda Marine 4-Stroke 5, 7.5, 8 & 10 HP Outboards – Replaces 19210-881-003, 19210-881-A01 & 19210-881-A02
Water Pump Impeller for Honda Marine 4-Stroke 5, 7.5, 8 & 10 HP Outboards – Replaces 19210-881-003, 19210-881-A01 & 19210-881-A02 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump Impeller for Honda Marine 4-Stroke 5, 7.5, 8 & 10 HP...
Water Pump Impeller for Honda Marine 4-Stroke 5, 7.5, 8 & 10 HP Outboards – Replaces 19210-881-003, 19210-881-A01 & 19210-881-A02 is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality aftermarket water pump impeller is designed for selected Honda Marine 4-stroke outboards rated at 5 HP, 7.5 HP, 8 HP and 10 HP. It supports reliable water-pump operation and helps maintain proper cooling-water circulation when replacing a worn or damaged impeller.
This impeller is listed as a replacement for Honda OEM numbers 19210-881-003, 19210-881-A01 and 19210-881-A02. It is also cross-referenced to Sierra 18-3245 and Mallory Marine 9-45100.
- Aftermarket replacement impeller for selected Honda Marine 4-stroke outboards.
- Direct-replacement design for the listed application range.
- Manufactured from a durable rubber/neoprene compound for marine cooling-system service.
- Use the engine model and existing impeller dimensions to confirm compatibility before ordering.
Part Number Matrix
Use these references to compare the impeller with your original part and other catalog listings.
| Brand or Reference Type | Part Number |
|---|---|
| Honda OEM | 19210-881-003 |
| Honda OEM | 19210-881-A01 |
| Honda OEM | 19210-881-A02 |
| Sierra aftermarket reference | 18-3245 |
| Mallory Marine aftermarket reference | 9-45100 |
Engine & Model Compatibility
This product is for selected Honda Marine 4-stroke outboards rated at 5, 7.5, 8 and 10 HP. Horsepower alone is not sufficient to confirm fitment; check the engine model, the OEM reference and the impeller dimensions before installation.
| Brand | Model or Rating | Rated HP | Stroke | OEM Part References | Fitment Notes |
|---|---|---|---|---|---|
| Honda Marine | Selected BF5 models | 5 HP | 4-Stroke | 19210-881-003, 19210-881-A01, 19210-881-A02 | Confirm the exact model code and impeller dimensions. |
| Honda Marine | Selected BF75 models | 7.5 HP | 4-Stroke | 19210-881-003, 19210-881-A01, 19210-881-A02 | Confirm the exact model code and impeller dimensions. |
| Honda Marine | Selected BF8 models | 8 HP | 4-Stroke | 19210-881-003, 19210-881-A01, 19210-881-A02 | Confirm the exact model code and impeller dimensions. |
| Honda Marine | Selected BF10 models | 10 HP | 4-Stroke | 19210-881-003, 19210-881-A01, 19210-881-A02 | Confirm the exact model code and impeller dimensions. |
Technical Specs
- Product Type
- Water pump impeller
- Application
- Selected Honda Marine 4-stroke outboards rated at 5, 7.5, 8 and 10 HP
- Installation
- Direct replacement for the listed application and reference numbers
- Material
- Rubber/neoprene compound
- Color
- Black
- Inner Diameter
- 14.20 mm
- Outer Diameter
- 41.00 mm
- Height
- 23.00 mm
- Replacement References
- Honda 19210-881-003, 19210-881-A01, 19210-881-A02; Sierra 18-3245; Mallory Marine 9-45100
What’s in the Box
- 1 x Water pump impeller
This listing is for the impeller only. A drive key, gasket, water-pump housing and other service parts are not included unless specifically stated by the seller.
Installation Notes
- Disconnect the battery and remove the engine stop-switch lanyard before beginning service.
- Place the engine in neutral and remove the lower unit according to the engine manufacturer’s service procedure.
- Remove the water-pump housing cover and inspect the housing, wear plate, seals and drive key for damage or wear.
- Note the direction of the old impeller vanes before removing the old impeller.
- Remove the old impeller and retain the drive key if it is reusable and not included with the replacement part.
- Clean debris from the water-pump housing and verify that the replacement impeller dimensions match the original.
- Lubricate the impeller and housing with a lubricant suitable for outboard water-pump service.
- Install the drive key and slide the new impeller onto the shaft while turning the impeller in the correct direction so the vanes seat properly.
- Reinstall the water-pump housing and tighten its fasteners to the engine manufacturer’s specification.
- Reattach the lower unit, ensuring that the driveshaft and water tube are correctly aligned.
- Run the engine only in water or with an appropriate flushing device, then confirm a steady cooling-water telltale stream and verify that the engine does not overheat.
Troubleshooting & FAQ
How do I know if this impeller fits my Honda outboard?
Confirm that your engine is a Honda Marine 4-stroke rated at 5, 7.5, 8 or 10 HP, then compare the exact model code, the original impeller and one of the listed OEM references. Also verify the dimensions of 14.20 mm inner diameter, 41.00 mm outer diameter and 23.00 mm height.
What are the signs of a failing water-pump impeller?
Common signs include engine overheating at idle or low speed, a weak or intermittent telltale stream, reduced cooling-water flow and visible cracks, stiffness, missing vanes or deformation when the impeller is inspected.
How often should an outboard impeller be replaced?
Replacement intervals depend on operating hours, storage conditions and water quality. Inspect the impeller during scheduled service and replace it when it shows wear, damage or loss of flexibility. Saltwater, sand and silt can shorten service life.
Is this difficult to install?
Installation requires removal of the lower unit and access to the water-pump housing. It may be suitable for an experienced DIY owner, but professional installation is recommended if you are not familiar with outboard lower-unit service.
Is this an OEM part?
No. This is an aftermarket replacement impeller. Honda OEM numbers are provided only as fitment and reference information.
Are the drive key and gasket included?
No additional components are specified for this listing. The package contains one impeller only; verify any required drive key, gasket or other water-pump service parts separately.
What is the shipping speed and cost?
Available shipping methods, delivery estimates and shipping charges are shown at checkout and depend on the destination and service selected.
What is the warranty and return policy?
Warranty coverage and return eligibility are governed by the seller’s current policies. Contact customer support before installation if the part does not match the ordered application or if there is visible damage.
Safety & Important Information
- Verify the exact engine model, stroke, horsepower rating, OEM reference and impeller dimensions before ordering.
- Do not operate the outboard without an adequate water supply. Never run the engine dry.
- Inspect the water-pump housing and related service parts during installation; replace damaged components as needed.
- This is an aftermarket replacement, not an OEM Honda component.
- Professional installation is recommended when lower-unit service is outside your experience.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for routine marine maintenance and repair.
- Application-Focused Listings — Product references and fitment information are provided to help you compare the part before ordering.
- Support When Needed — Contact customer support if you need help comparing your original part with the listed references.
Payment & Security
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