Water Pump Impeller with Key for Mercury Mariner 2-Stroke 75–225 HP – Replaces 47-89984T4
Water Pump Impeller with Key for Mercury Mariner 2-Stroke 75–225 HP – Replaces 47-89984T4 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller with Key for Mercury Mariner 2-Stroke 75–225 HP...
Water Pump Impeller with Key for Mercury Mariner 2-Stroke 75–225 HP – Replaces 47-89984T4 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 compatible Mercury Mariner 2-stroke outboard applications from 75 to 225 HP. The impeller helps maintain water circulation through the cooling system and is supplied with the matching key required for installation.
The impeller is listed as an aftermarket replacement for 18-3017 and cross-references the following manufacturer part numbers: 47-803631T, 47-89984T4, 47-F694065, 47-30221, 47-65960, and 47-85460.
- Water pump impeller with key included.
- For selected Mercury Mariner 2-stroke engines rated 75, 80, 85, 90, 110, 115 through 225 HP.
- Designed as a direct replacement in a compatible water pump housing.
- Aftermarket replacement part; not manufactured by Mercury.
Part Number Matrix
Use the references below together with your engine model and serial number to confirm compatibility before ordering.
| Reference Type | Part Number |
|---|---|
| Aftermarket reference | 18-3017 |
| Mercury reference | 47-803631T |
| Mercury reference | 47-89984T4 |
| Force reference | 47-F694065 |
| Reference | 47-30221 |
| Reference | 47-65960 |
| Reference | 47-85460 |
Engine Compatibility
The company fitment record identifies this product for Mercury Mariner 2-stroke engines rated 75, 80, 85, 90, 110, 115 through 225 HP. Horsepower alone is not sufficient to confirm fitment. Match the original impeller reference and verify the complete model and serial-number range in the applicable service documentation.
| Brand | Engine Type | Rated HP | Stroke | Fitment Note |
|---|---|---|---|---|
| Mercury Mariner | Compatible outboard applications | 75 | 2-Stroke | Verify model and serial number. |
| Mercury Mariner | Compatible outboard applications | 80 | 2-Stroke | Verify model and serial number. |
| Mercury Mariner | Compatible outboard applications | 85 | 2-Stroke | Verify model and serial number. |
| Mercury Mariner | Compatible outboard applications | 90 | 2-Stroke | Verify model and serial number. |
| Mercury Mariner | Compatible outboard applications | 110 | 2-Stroke | Verify model and serial number. |
| Mercury Mariner | Compatible outboard applications | 115–225 | 2-Stroke | Verify model and serial number. |
This listing is not presented as a general-fit impeller for OMC, Johnson, Evinrude, or unrelated Force applications. If your engine is not a Mercury Mariner 2-stroke application within the stated range, confirm the original part number and pump dimensions with the manufacturer documentation before purchasing.
Technical Specifications
- Product Type
- Water pump impeller with key
- Application
- Mercury Mariner 2-stroke outboard engines
- Rated Horsepower Range
- 75, 80, 85, 90, 110, 115–225 HP
- Installation
- Direct replacement for compatible water pump assemblies
- Aftermarket Reference
- 18-3017
- Key
- Included
What's in the Box
- 1 x aftermarket water pump impeller
- 1 x matching impeller key
Gaskets, seals, wear plates, pump housings, and complete water pump repair-kit components are not included unless specifically stated in the order details.
Installation Notes
- Disconnect the battery and follow the engine manufacturer's service procedure.
- Remove the lower unit and water pump cover as specified in the service manual.
- Remove the old impeller and retain the original key only if it is serviceable and the service manual permits reuse.
- Clean the pump housing and wear surfaces. Replace damaged or excessively worn components before installation.
- Install the supplied key in the driveshaft keyway, then install the impeller in the correct orientation.
- Reinstall the pump housing and lower unit using the manufacturer's torque specifications and sealing procedure.
- Run the engine only in water or with an appropriate flushing device. Confirm a steady cooling-water tell-tale stream and check for leaks or overheating.
Professional installation is recommended if you are not familiar with outboard lower-unit or water-pump service.
Troubleshooting & FAQ
How do I confirm that this impeller fits my engine?
Check the original impeller or service-manual part number, then compare it with the references listed above. Also verify that your engine is a Mercury Mariner 2-stroke application in the stated 75, 80, 85, 90, 110, 115–225 HP range and confirm the model and serial number.
What are common signs of a worn impeller?
Possible symptoms include a weak or missing tell-tale stream, overheating, steam, or visibly cracked, hardened, or damaged impeller blades. Inspect the pump housing and wear surfaces whenever the impeller is replaced.
Is the key included?
Yes. This product is supplied as a water pump impeller with the matching key.
Does this include gaskets or a complete pump kit?
No. The package contains one impeller and one key. Gaskets, seals, wear plates, and other water-pump components are sold separately unless expressly included in the order details.
Is this an OEM part?
No. This is an aftermarket replacement. The manufacturer and reference numbers are supplied only to help identify the intended application and cross-reference the replacement.
How often should an impeller be replaced?
Inspect the impeller according to your engine manufacturer's maintenance schedule and replace it whenever it shows wear, deformation, cracking, hardening, or reduced cooling performance. Frequent saltwater, sandy, or silty use may require more frequent inspection.
Safety & Important Information
- Verify the complete engine model, serial number, original part number, and pump configuration before ordering.
- Do not rely on horsepower alone to establish compatibility.
- Do not operate an outboard engine without an adequate water supply.
- This is an aftermarket replacement, not an OEM component.
- Stop operation immediately if the engine overheats or the cooling-water tell-tale stream is weak or absent.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine maintenance and repair.
- Fitment-Focused Listings — Product references and application information are provided to help customers verify compatibility before ordering.
- Global Fulfillment — Standard and expedited delivery options are shown at checkout where available.
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