Water Pump Impeller Service Kit with Housing – Fits Mercury Mariner 2-Stroke 4–9.8 HP (Replaces 46-70941A3)
Water Pump Impeller Service Kit with Housing – Fits Mercury Mariner 2-Stroke 4–9.8 HP (Replaces 46-70941A3) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Service Kit with Housing – Fits Mercury Mariner...
Water Pump Impeller Service Kit with Housing – Fits Mercury Mariner 2-Stroke 4–9.8 HP (Replaces 46-70941A3) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller Service Kit with Housing is designed for selected Mercury and Mariner 2-stroke outboard applications in the 4 HP, 4.5 HP, 6 HP, 7.5 HP, and 9.8 HP range. It is intended to service the water pump and restore dependable cooling-system circulation when the impeller, pump housing, or related service components are worn.
The kit is associated with Mercury Marine reference 46-70941A3 and includes a replacement pump housing together with the water-pump impeller and service components supplied for this application. Always compare your original parts and verify the engine serial-number range before installation.
- Complete water-pump service configuration with housing.
- Designed for selected Mercury and Mariner 2-stroke outboards.
- Supports replacement of worn or damaged water-pump components during routine cooling-system service.
- Aftermarket replacement part; Mercury, Sierra, and GLM references are provided for identification and cross-reference purposes only.
Part Number Matrix
Use these manufacturer and aftermarket references to compare the kit with your existing water-pump components.
| Brand | Reference | Application in the Catalog |
|---|---|---|
| Mercury Marine | 46-70941A3 | Water-pump service reference |
| Mercury Marine | 46-46893A6 | Water pump housing assembly reference |
| Mercury Marine | 47-22748 | Water pump impeller reference |
| Sierra | 18-3446 | Water pump kit cross-reference |
| GLM Marine | 12122 | Water pump complete service kit cross-reference |
Engine & Model Compatibility
This kit is intended for selected Mercury and Mariner 2-stroke outboards rated at 4 HP, 4.5 HP, 6 HP, 7.5 HP, and 9.8 HP. Catalog references identify the 4 HP, 4.5 HP, 7.5 HP, and 9.8 HP applications primarily within the 1975–1985 range; the company fitment record also lists the 6 HP application.
Fitment depends on the complete engine model and serial-number break, not horsepower alone. Confirm the serial number, pump-housing design, impeller dimensions, and original reference number before ordering.
| Brand | Rated HP | Stroke | Catalog Year Range | Reference | Fitment Note |
|---|---|---|---|---|---|
| Mercury / Mariner | 4 | 2-Stroke | 1975–1985 | 46-70941A3 | Verify the exact model and serial number. |
| Mercury / Mariner | 4.5 | 2-Stroke | 1975–1985 | 46-70941A3 | Verify the exact model and serial number. |
| Mercury / Mariner | 6 | 2-Stroke | See serial-number break | 46-70941A3 / 46-46893A6 | Confirm the housing and impeller configuration. |
| Mercury / Mariner | 7.5 | 2-Stroke | 1975–1985 | 46-70941A3 | Verify the exact model and serial number. |
| Mercury / Mariner | 9.8 | 2-Stroke | 1975–1985 | 46-70941A3 | Some catalog listings identify this application as Model 110; verify serial number. |
Technical Specs
- Product Type
- Water pump impeller service kit with housing
- Engine Type
- Selected Mercury and Mariner 2-stroke outboards
- Rated Horsepower
- 4, 4.5, 6, 7.5, and 9.8 HP applications
- Primary Mercury Reference
- 46-70941A3
- Housing Reference
- 46-46893A6
- Impeller Reference
- 47-22748
- Impeller Reference Dimensions
- Approximately 1.250 inches outside diameter and 0.456 inches inside diameter, where applicable; verify against the original part.
- Installation
- Replacement service; installation should follow the engine manufacturer's service procedure.
What’s in the Box
This listing is supplied as a water-pump service kit with housing. The package includes the replacement water-pump housing, water-pump impeller, and the associated service components supplied for this application.
- Water pump housing
- Water pump impeller
- Water-pump service gaskets, seals, and related components as supplied for the application
Package contents may vary by application configuration. Compare the included parts with the original assembly before beginning installation.
Installation Notes
- Confirm the engine model, serial number, stroke type, and original water-pump references before disassembly.
- Disconnect the battery or ignition power and follow the safety instructions in the engine service manual.
- Remove the lower unit according to the manufacturer's service procedure.
- Remove the old water-pump housing, impeller, wear surfaces, and related seals or gaskets.
- Clean the mating surfaces and inspect the driveshaft, key or drive feature, pump base, and water passages for wear or damage.
- Install the replacement service components in the correct order and orientation. Do not force the impeller or housing into place.
- Lubricate the impeller and housing as recommended by the engine manufacturer, using a lubricant compatible with the pump materials.
- Reinstall the lower unit and tighten all fasteners to the manufacturer's specifications.
- Run the engine only in an appropriate test tank or in the water. Confirm a steady cooling-water tell-tale stream and check for leaks or overheating.
Troubleshooting & FAQ
How do I confirm this kit fits my motor?
Check the complete engine model and serial number against the application information, then compare the original pump housing and impeller with the references and dimensions listed above. Horsepower by itself is not sufficient to confirm fitment.
Which engines are covered by the listed application?
The company fitment record lists Mercury and Mariner 2-stroke applications in the 4 HP, 4.5 HP, 6 HP, 7.5 HP, and 9.8 HP range. Catalog references identify the 4 HP, 4.5 HP, 7.5 HP, and 9.8 HP applications primarily from 1975–1985. Always verify the serial-number break.
What symptoms indicate a worn water-pump impeller?
Common symptoms include a weak or missing tell-tale stream, overheating, an overheating alarm, or visible impeller damage. Stop operating the engine if it overheats and inspect the cooling system before further use.
Does the kit include the water-pump housing?
Yes. The applicable company product record describes this product as a water-pump service kit with housing. Confirm the housing style and serial-number range before installation.
Is this an OEM part?
No. This is an aftermarket replacement kit. The Mercury, Sierra, and GLM numbers shown on this page are manufacturer or aftermarket reference numbers used for identification and cross-reference.
How often should the impeller be replaced?
Replacement intervals depend on operating conditions, storage, water quality, and the engine manufacturer's maintenance schedule. Inspect the impeller regularly and replace it when it shows cracking, hardening, vane damage, deformation, or reduced cooling-water flow.
Safety & Important Info
- Verify the engine model, year or production range, stroke type, serial number, and original part before ordering.
- Do not rely on horsepower alone for fitment confirmation.
- Compare the original housing, impeller, key or drive feature, and seals with the supplied components.
- Never run an outboard without adequate cooling-water supply.
- This is an aftermarket replacement, not an OEM component. Professional installation is recommended when the correct service procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for practical marine repair and maintenance applications.
- Application-Focused Information — Reference numbers and fitment details are presented to help customers compare their original parts before ordering.
- Service Support — For the best result, use the engine manufacturer's service instructions and verify the complete model and serial-number information.
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