Water Pump Impeller with Key – Fits Select Honda 70–90 HP and Mercury/Mariner 2-Stroke 60–225 HP
Water Pump Impeller with Key – Fits Select Honda 70–90 HP and Mercury/Mariner 2-Stroke 60–225 HP is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller with Key – Fits Select Honda 70–90 HP and Mercu...
Water Pump Impeller with Key – Fits Select Honda 70–90 HP and Mercury/Mariner 2-Stroke 60–225 HP is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller with key is an aftermarket replacement for selected Honda Marine and Mercury/Mariner outboard water pump applications. The product is supplied as one impeller with a key and is designed to restore water-pump circulation when the original impeller is worn, cracked, hardened, or damaged.
Company fitment information identifies applications including select Honda outboards rated at 70–90 HP, Mercury/Mariner 2-stroke outboards rated at 60–225 HP, and selected Mercury/Mariner 4-stroke applications ranging from 30 to 300 HP. Exact model, stroke type, gearcase configuration, and serial-number conditions vary by application, so compare your original impeller and engine parts information before ordering.
- Product type: Water pump impeller with key
- Installation: Direct replacement in the matching factory water pump housing
- Material: Flexible marine-grade impeller rubber; compound details are not specified by the product record
- Included key: One matching key is included with the impeller
- Brand status: Aftermarket replacement, not an original equipment component
Reference Part Numbers
The following manufacturer and aftermarket references are associated with this impeller application. They are provided for identification and cross-reference purposes only; confirm the complete engine application before purchase.
| Brand | Reference number |
|---|---|
| Honda | 19210-ZW1-003; 19210-ZW1-303 |
| Mercury/Mariner | 47-43026T2; 47-430262Q02 |
| Sierra | 18-3056; 18-3056-10 |
| Mallory | 9-45037 |
| Johnson/Evinrude | 399289; 391538 |
Engine Compatibility
Use the following information as an application guide, not as a substitute for checking the engine model and serial number.
| Manufacturer | Stroke | Rated horsepower | Application information |
|---|---|---|---|
| Honda Marine | 4-Stroke | 70–90 HP | Select Honda outboard applications listed by the company |
| Mercury/Mariner | 2-Stroke | 60–225 HP | Selected 2-stroke applications; exact model and serial conditions must be confirmed |
| Mercury/Mariner | 4-Stroke | 30–300 HP | Selected applications including 30, 40, 45, 50, 60, 80, 100, 115, 135, 150, 175, 200, 225, 250, 275, and 300 HP families |
Johnson/Evinrude reference numbers are listed above for identification, but a specific Johnson or Evinrude engine fitment is not stated in the available company record. Do not rely on the reference number alone to confirm compatibility.
Technical Specifications
- Product type
- Water pump impeller with key
- Quantity
- One impeller with one key
- Application
- Outboard water pump cooling systems
- Construction
- Flexible marine impeller rubber
- Installation position
- Matching water pump housing on the outboard gearcase
- Part status
- Aftermarket replacement
What's in the Box
- 1 x Water pump impeller
- 1 x Matching impeller key
Water pump cover gaskets, wear plates, seals, bolts, and other pump-service components are not included unless separately stated for your order.
Installation Notes
- Disconnect the battery and follow the outboard manufacturer's safety procedures before servicing the lower unit.
- Remove the lower unit and access the water pump assembly according to the service manual for your exact engine.
- Remove the pump cover, old impeller, and old key. Note the original impeller orientation before removal.
- Clean the pump housing, keyway, and mating surfaces. Inspect the housing, wear plate, seals, and gaskets for wear or damage.
- Install the supplied key and slide the new impeller into position. Use only a lubricant approved for the impeller material and the engine manufacturer's service procedure.
- Reinstall the pump cover and any required gaskets or seals. Do not reuse damaged sealing components.
- Reinstall the lower unit, reconnect the battery, and test the cooling-water tell-tale flow before normal operation.
Because water-pump layouts and shaft-rotation procedures vary between engine families, follow the service manual for your exact model rather than relying on a general installation sequence.
Troubleshooting & FAQ
When should an impeller be replaced?
Replace an impeller when it is cracked, brittle, deformed, damaged, or no longer producing the expected cooling-water flow. A weak tell-tale stream or an overheating warning can indicate a cooling-system problem, but other components should also be inspected.
Does this product include the key?
Yes. The company product description identifies this item as a water pump impeller with key, and the supplied contents are one impeller and one matching key.
Does this include a complete water pump repair kit?
No. This listing is for a single impeller supplied with its key. A gasket, wear plate, seal, pump cover, and other water-pump components are not included unless separately specified.
How do I confirm fitment?
Match the engine manufacturer, horsepower, stroke type, exact model, gearcase configuration, and serial-number range where applicable. Also compare the original impeller, keyway, and pump housing before installation.
Is this an OEM part?
No. This is an aftermarket replacement. The manufacturer and aftermarket reference numbers shown on this page are cross-reference identifiers and do not mean that the replacement is manufactured by the original engine manufacturer.
Safety & Important Information
- Verify the complete application against your engine and original part before ordering.
- Do not use a horsepower-only match as final confirmation; stroke type, model, gearcase, and serial conditions may affect fitment.
- Stop operation immediately if the engine overheats or the tell-tale flow is weak after installation.
- Professional installation is recommended when lower-unit removal or water-pump servicing is unfamiliar.
- Manufacturer names and part numbers are used only for identification and compatibility reference.
About Sea Sierra
- Marine replacement parts — Practical aftermarket components for routine outboard maintenance and repair.
- Application-focused listings — Reference numbers and fitment guidance are provided to help you compare the correct part.
- Support for installation planning — Always use the service information for your exact engine when completing water-pump work.
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