Water Pump Repair Kit with Housing – Fits Mercury/Mariner 6, 8, 9.9, 10 & 15 HP Outboards
Water Pump Repair Kit with Housing – Fits Mercury/Mariner 6, 8, 9.9, 10 & 15 HP Outboards is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit with Housing – Fits Mercury/Mariner 6, 8, 9.9...
Water Pump Repair Kit with Housing – Fits Mercury/Mariner 6, 8, 9.9, 10 & 15 HP Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This water pump repair kit with housing is designed for selected Mercury and Mariner outboard motors. It is listed for 2-stroke engines rated 6, 8, 9.9, 10 and 15 HP, as well as selected 4-stroke 8, 9.9 and 15 HP engines. The kit is intended to service the water pump and restore proper cooling-system operation when the existing pump components or housing are worn.
The kit is associated with Mercury/Mariner references including 46-42089A5, 46-42089A4, 46-42040A1, 46-42040A3, 46-42040A5, 46-42040T5 and 26-41365A3. Aftermarket reference numbers include GLM Marine 12305 and Sierra/SEI West Marine 18-3149.
- Water pump service kit supplied with the pump housing.
- Designed for selected Mercury and Mariner 2-stroke and 4-stroke outboards.
- Supports replacement of worn water-pump service components and housing as applicable to the listed application.
- Aftermarket replacement part; it is not a genuine Mercury component.
Part Number Matrix
Use the following references to compare the part listed in your engine or parts manual. Confirm the complete engine application before ordering.
| Reference Type | Brand | Part Number |
|---|---|---|
| OEM reference | Mercury/Mariner | 46-42089A5 |
| OEM reference | Mercury/Mariner | 46-42089A4 |
| OEM reference | Mercury/Mariner | 46-42040A1 |
| OEM reference | Mercury/Mariner | 46-42040A3 |
| OEM reference | Mercury/Mariner | 46-42040A5 |
| OEM reference | Mercury/Mariner | 46-42040T5 |
| OEM reference | Mercury/Mariner | 26-41365A3 |
| Aftermarket reference | GLM Marine | 12305 |
| Aftermarket reference | Sierra/SEI West Marine | 18-3149 |
Engine Compatibility
Company fitment data lists Mercury and Mariner outboards rated at 6, 8, 9.9, 10 and 15 HP. Stroke type and engine configuration must be checked together because the listed applications are not identical across all engines.
| Brand | Stroke | Rated HP | Additional Conditions |
|---|---|---|---|
| Mercury/Mariner | 2-Stroke | 6, 8, 9.9, 10, 15 HP | Company-listed 2-stroke applications. |
| Mercury/Mariner | 4-Stroke | 8 HP | 232 cc and 323 cc configurations are listed; standard configuration. |
| Mercury/Mariner | 4-Stroke | 9.9 HP | 232 cc and 323 cc configurations are listed; standard configuration. |
| Mercury/Mariner | 4-Stroke | 15 HP | 323 cc standard configuration is listed. |
| Mercury/Mariner | 4-Stroke | Selected applications | One company listing specifies standard serial range 0P075166–0P325499 for the applicable 232 cc/323 cc range. Verify the engine serial number before purchase. |
Fitment note: Horsepower alone is not sufficient to confirm compatibility. Compare the engine brand, stroke, displacement or configuration, serial number and the original pump reference with the information above.
Technical Specifications
- Product Type
- Water pump repair/service kit with housing
- Application
- Selected Mercury and Mariner marine outboards
- Stroke Applications
- 2-stroke and selected 4-stroke engines
- Rated Horsepower
- 6, 8, 9.9, 10 and 15 HP, subject to configuration and serial-number conditions
- Primary OEM Reference
- 46-42089A5
- Aftermarket References
- GLM Marine 12305; Sierra/SEI West Marine 18-3149
- Product Status
- Aftermarket replacement part
What's in the Box
- 1 x Water pump repair/service kit
- Water pump housing included
- Water-pump service components supplied for the listed application
Exact internal component quantities may vary by application. Verify the product image and the contents supplied with the order before installation.
Installation Notes
- Confirm the engine model, stroke type, configuration and serial number before beginning work.
- Disconnect the battery where applicable and follow the engine manufacturer's service-manual safety procedures.
- Remove the lower unit according to the manufacturer's instructions.
- Remove the existing water-pump housing and inspect the driveshaft, key, water tube and mating surfaces.
- Clean the mating surfaces and compare the replacement housing and service components with the original parts.
- Install the replacement pump components and housing in the orientation specified by the engine service manual.
- Use the manufacturer's specified fasteners, sealants and torque values; do not substitute general-purpose specifications.
- Reinstall the lower unit and verify that the water tube and driveshaft are correctly engaged.
- Test the outboard in an appropriate water supply and confirm a steady cooling-water discharge before normal operation.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Compare your engine brand, horsepower, stroke type, configuration, serial number and original water-pump reference with the compatibility information on this page. Do not rely on horsepower alone.
Does this kit include the water-pump housing?
Yes. The company product description identifies this item as a water-pump service or repair kit with housing.
Is this an OEM Mercury part?
No. This is an aftermarket replacement kit that references Mercury/Mariner OEM numbers for application comparison.
Can I use the 2-stroke fitment information for a 4-stroke engine?
No. The 2-stroke and 4-stroke applications must be treated separately. Confirm the complete engine configuration and, where applicable, the serial-number range before ordering.
What are common signs of a worn water pump?
Possible symptoms include weak or absent tell-tale water flow, overheating warnings, steam or reduced cooling performance. Inspect the full cooling system before replacing parts.
Should installation be performed by a professional?
Professional installation is recommended if you are not experienced with lower-unit removal or outboard cooling-system service. Follow the engine manufacturer's service manual for all procedures and torque values.
What should I do if the engine still overheats after installation?
Check for blocked cooling passages, a damaged water tube, incorrect component orientation, leaking seals, a thermostat problem or other cooling-system faults. Stop operating the engine if overheating continues.
Safety & Important Information
- Confirm the complete application before ordering; the listed horsepower range includes multiple stroke types and configurations.
- Compare the replacement housing and components with the original parts before installation.
- Use the manufacturer's service manual for disassembly, assembly, torque and testing procedures.
- This is an aftermarket replacement product and is not manufactured by Mercury Marine.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard service.
- Application-Focused Listings — Product references and fitment information are provided to support accurate part comparison.
- Service Support — Always verify the engine's complete model and serial information before installation.
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