Aftermarket Water Pump Service Kit for Mercury 40, 50 & 60 HP EFI 4-Stroke Outboards – Replaces 46-812966A12
Aftermarket Water Pump Service Kit for Mercury 40, 50 & 60 HP EFI 4-Stroke Outboards – Replaces 46-812966A12 is backordered and will ship as soon as it is back in stock.
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Aftermarket Water Pump Service Kit for Mercury 40, 50 & 60 HP E...
Aftermarket Water Pump Service Kit for Mercury 40, 50 & 60 HP EFI 4-Stroke Outboards – Replaces 46-812966A12 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump service kit is an aftermarket replacement for selected Mercury and Mariner 40, 50, and 60 HP EFI 4-stroke outboards. It is intended to restore the water pump assembly during cooling-system service and replaces the Mercury OEM reference 46-812966A12.
The kit is designed for the specific 40–60 HP EFI 4-stroke application shown below. Confirm the OEM reference and your engine configuration before ordering; horsepower alone is not sufficient to establish fitment.
- Aftermarket replacement water pump service kit.
- Suitable for the listed Mercury and Mariner EFI 4-stroke applications.
- Includes the principal water pump service components listed below, including the impeller, housing, gaskets, wear plate, pump base, and related sealing hardware.
Part Number Matrix
Use these references to compare the service-kit application with your original part.
| Brand | Part Number | Reference Type |
|---|---|---|
| Mercury | 46-812966A12 | OEM replacement reference |
Engine & Model Compatibility
The documented application is limited to the following horsepower and engine configuration. Model-year and serial-number coverage is not specified in the available reference material, so verify the OEM number on your existing service parts before installation.
| Brand | Engine Application | Rated HP | Stroke | EFI | OEM Part No. | Fitment Notes |
|---|---|---|---|---|---|---|
| Mercury / Mariner | Outboard | 40 | 4-Stroke | Yes | 46-812966A12 | Use only where the original water pump service-kit reference matches. |
| Mercury / Mariner | Outboard | 50 | 4-Stroke | Yes | 46-812966A12 | Use only where the original water pump service-kit reference matches. |
| Mercury / Mariner | Outboard | 60 | 4-Stroke | Yes | 46-812966A12 | Use only where the original water pump service-kit reference matches. |
Technical Specs
- Product Type
- Water pump service kit
- Application
- Mercury and Mariner 40, 50, and 60 HP EFI 4-stroke outboards
- Replacement Reference
- Mercury OEM 46-812966A12
- Construction
- Marine-service replacement components, including rubber and metal pump components
- Installation
- Direct replacement when the original application and part reference match
- Fitment Limitation
- Model-year and serial-number coverage is not specified; verify the original part number before purchase
What’s in the Box
- 1 x Water pump impeller — 47-19453T
- 1 x Pump housing — 14334A3
- 1 x Wear plate — 19700A2
- 1 x Upper gasket — 27-822189
- 1 x Lower gasket — 27-19701
- 1 x Water pump base — 46-812966A7
- 1 x 4-stroke tube seal — 859770-1
- 2 x Plastic washer — 12-858234
- 1 x O-ring
Component quantities and part references are provided as an application guide. Compare the supplied parts with the components removed from your engine before installation.
Installation Notes
- Disconnect the battery, turn the engine off, and allow it to cool completely.
- Place the outboard in a secure service position and follow the applicable manufacturer procedure for lower-unit removal.
- Remove the old water pump housing, impeller, gaskets, wear plate, base, and sealing components.
- Clean all mating surfaces and inspect the driveshaft, water tube, keyway, and surrounding components for wear or damage.
- Install the replacement components in the correct order. Ensure the impeller key is correctly seated if the engine uses a keyed impeller shaft.
- Lubricate the impeller and housing with a suitable water-pump installation lubricant. Do not use petroleum grease unless specifically approved for the application.
- Rotate the driveshaft in the correct direction while fitting the housing over the impeller so the impeller vanes are set properly.
- Reinstall the lower unit, aligning the driveshaft, shift shaft, and water tube.
- Tighten all fasteners to the manufacturer’s specified torque.
- Run the engine only in water or with an approved flushing device, then confirm a steady tell-tale stream and normal operating temperature.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Confirm that your outboard is a Mercury or Mariner 40, 50, or 60 HP EFI 4-stroke model and compare the original water pump service-kit reference with 46-812966A12. Check the exact engine model and serial information in the manufacturer service documentation because horsepower alone does not confirm fitment.
What are the signs of a failing water pump?
Common symptoms include a weak or missing tell-tale stream, overheating warnings, abnormal operating temperature, steam, or reduced cooling-water flow. Stop operating the engine if overheating is suspected.
Does the kit include the pump housing?
Yes. The listed kit contents include a replacement water pump housing, impeller, wear plate, pump base, gaskets, tube seal, washers, and an O-ring.
Is this an OEM Mercury kit?
No. This is an aftermarket replacement kit that references Mercury OEM part number 46-812966A12 for application identification. It is not represented as a genuine Mercury-branded product.
Should the water pump impeller be replaced on a schedule?
Follow the maintenance interval in your engine manufacturer’s service manual. Inspection or replacement may be needed sooner when the outboard is used in sand, silt, salt water, or other conditions that can accelerate water-pump wear.
What if the supplied components do not match my original parts?
Do not force installation. Stop and compare the OEM reference, engine model, and serial information. Contact the seller before installation if the component shape, dimensions, or part references differ.
Safety & Important Info
- Verify the OEM reference, engine configuration, and component dimensions before purchase.
- Do not operate the engine without an adequate water supply or an approved flushing device.
- Use the manufacturer’s service manual for disassembly procedures, fastener torque, and final testing.
- Professional installation is recommended if you are not experienced with outboard lower-unit service.
- This is an aftermarket replacement, not a genuine OEM component.
About Sea Sierra
- Marine-Focused Parts — Replacement components selected for common outboard maintenance and repair applications.
- Application-Based Listing — Product references and fitment information are provided to help match the original service part.
- Support for Installation Decisions — Always compare the original component and manufacturer service information before fitting a replacement.
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