Water Pump Repair Kit Without Housing – Fits Mercury/Mariner 2-Stroke 4–9.8 HP (Replaces 47-89981Q1, 47-89981T1, 47-89981T2)
Water Pump Repair Kit Without Housing – Fits Mercury/Mariner 2-Stroke 4–9.8 HP (Replaces 47-89981Q1, 47-89981T1, 47-89981T2) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Repair Kit Without Housing – Fits Mercury/Mariner 2-Stro...
Water Pump Repair Kit Without Housing – Fits Mercury/Mariner 2-Stroke 4–9.8 HP (Replaces 47-89981Q1, 47-89981T1, 47-89981T2) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit without housing is designed for selected Mercury and Mariner 2-stroke outboard applications from 4 HP through 9.8 HP. It is intended for water pump service and impeller replacement in the lower unit, helping restore the water pump's ability to circulate cooling water through the engine.
The kit is associated with Mercury/Mariner reference numbers 47-89981Q1, 47-89981T1, and 47-89981T2. Cross-reference listings also identify Sierra 18-3239 and GLM 12270 as aftermarket service-kit references. Confirm the part number, engine specifications, and serial-number range before ordering.
- Water pump service kit for selected Mercury/Mariner 2-stroke outboards.
- Supplied without the water pump housing.
- Uses a 0.456-inch internal diameter impeller specification for the applicable reference configuration.
- Designed as an aftermarket replacement for routine water pump repair.
Part Number Matrix
Use the following references to compare your existing part and confirm the correct application.
| Brand | Part Number | Reference Type |
|---|---|---|
| Mercury/Mariner | 47-89981Q1 | OEM reference |
| Mercury/Mariner | 47-89981T1 | OEM reference |
| Mercury/Mariner | 47-89981T2 | OEM reference |
| Sierra | 18-3239 | Aftermarket service-kit reference |
| GLM Marine | 12270 | Aftermarket service-kit reference |
Engine & Model Compatibility
The company fitment record identifies the following Mercury and Mariner 2-stroke horsepower applications. Model names, production years, and serial-number conditions may vary by engine configuration, so verify the identification plate and the original water pump components before installation.
| Brand | Engine Type | Rated HP | Stroke | Applicable References | Notes |
|---|---|---|---|---|---|
| Mercury/Mariner | Outboard | 4 HP | 2-Stroke | 47-89981Q1, 47-89981T1, 47-89981T2 | Confirm serial number and original part dimensions. |
| Mercury/Mariner | Outboard | 4.5 HP | 2-Stroke | 47-89981Q1, 47-89981T1, 47-89981T2 | Confirm serial number and original part dimensions. |
| Mercury/Mariner | Outboard | 6 HP | 2-Stroke | 47-89981Q1, 47-89981T1, 47-89981T2 | Confirm the water pump configuration before ordering. |
| Mercury/Mariner | Outboard | 7.5 HP | 2-Stroke | 47-89981Q1, 47-89981T1, 47-89981T2 | Confirm serial number and original part dimensions. |
| Mercury/Mariner | Outboard | 9.8 HP | 2-Stroke | 47-89981Q1, 47-89981T1, 47-89981T2 | Confirm serial number and original part dimensions. |
Technical Specifications
- Product Type
- Water pump repair kit
- Housing
- Not included
- Engine Type
- Selected Mercury/Mariner 2-stroke outboards
- Rated Horsepower Range
- 4 HP, 4.5 HP, 6 HP, 7.5 HP, and 9.8 HP applications
- Impeller Internal Diameter
- 0.456 inch for the applicable reference configuration
- Installation Location
- Lower unit water pump
- Product Status
- Aftermarket replacement
What's in the Box
- Water pump repair kit components for the applicable 0.456-inch impeller configuration.
- Water pump housing not included.
Exact seals, gaskets, plates, and other service components may vary by production batch. Compare the supplied components with the original parts before installation.
Installation Notes
- Disconnect the battery, place the outboard in neutral, and follow the engine manufacturer's safety procedures.
- Remove the lower unit according to the service manual for your specific engine.
- Open the water pump assembly and inspect the housing, wear surfaces, keyway, seals, and gaskets.
- Remove the old impeller and clean debris or corrosion from the water pump components.
- Confirm that the replacement impeller and service components match the original configuration before fitting them.
- Install the impeller with the vanes oriented in the correct direction of shaft rotation.
- Reassemble the water pump, ensuring that seals and gaskets are seated correctly. The housing is not supplied with this kit.
- Reinstall the lower unit and test the cooling-water flow in a safe environment before normal operation.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Check that your engine is a Mercury or Mariner 2-stroke application rated at 4, 4.5, 6, 7.5, or 9.8 HP. Then compare the original part number, impeller dimensions, water pump configuration, and serial-number information. If any detail differs, do not assume compatibility from horsepower alone.
Does this kit include the water pump housing?
No. This is a water pump service kit supplied without the water pump housing. Inspect your existing housing and replace it separately if it is damaged or excessively worn.
What are common signs of a worn impeller?
Common symptoms include weak or missing telltale-water flow, overheating at idle or low speed, and visible cracking, brittleness, or damaged vanes on the old impeller.
How often should an outboard impeller be inspected?
Inspect the impeller as part of regular cooling-system maintenance and whenever the engine shows reduced water flow or overheating. Replacement frequency depends on operating hours, storage conditions, and exposure to sand, silt, or salt water.
What if the engine still overheats after installation?
Check the water-intake screens, thermostat, cooling passages, seals, gaskets, impeller orientation, and water pump housing condition. If the problem continues, stop operating the engine and have the cooling system inspected by a qualified technician.
Is this an OEM part?
No. This is an aftermarket replacement intended for the listed applications and reference numbers. Mercury and Mariner are registered trademarks of their respective owners; this product is not manufactured by or affiliated with those brands.
Safety & Important Information
- Verify the engine model, horsepower, stroke, serial number, original part number, and dimensions before purchase.
- Do not operate an outboard without an adequate cooling-water supply.
- Replace damaged or worn water pump housing components separately; the housing is not included.
- Professional installation is recommended if you are not familiar with lower-unit service.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- We supply aftermarket marine replacement parts for routine maintenance and repair.
- Parts are selected for clearly identified marine applications and reference numbers.
- Always confirm fitment details before installation or ordering.
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