Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen II (Replaces 47-43026Q06, 47-8M0100526)
Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen II (Replaces 47-43026Q06, 47-8M0100526) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen II (Replaces 47-43026Q06, 47-8M0100526) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is designed for MerCruiser Alpha One Gen II sterndrives manufactured from 1991 onwards (serial numbers D469859 and above). It serves as a complete replacement solution to restore your engine's cooling system performance, preventing overheating and ensuring reliability on the water. This kit is also compatible with a range of Mercury Bigfoot and standard outboard engines.
It directly replaces MerCruiser part numbers 47-43026Q06 and 47-8M0100526, as well as Sierra 18-3214 and Quicksilver equivalents, providing a reliable aftermarket alternative.
- Installs in the lower unit of the sterndrive or outboard.
- Includes the impeller, housing plate, seals, and gaskets for a comprehensive service.
- Engineered to meet or exceed original equipment specifications for fit and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 47-43026Q06 |
| MerCruiser | 47-8M0100526 |
| Quicksilver | 47-43026Q06 |
| Quicksilver | 47-8M0100526 |
| Sierra | 18-3214 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this kit is specifically for Alpha One Gen II sterndrives with serial numbers D469859 and above.
This impeller kit is also compatible with certain Mercury outboards as detailed below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Alpha One Gen II | N/A | 4-Stroke | 1991 and newer | 47-43026Q06/47-8M0100526 | For stern drives with serial numbers D469859 and above |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Lower Unit/Sterndrive
What’s in the Box
- 1 x Impeller
- 1 x Face Seal
- 1 x Face Seal Setting Tool
- 1 x O-Ring
- 1 x Water Pump Base Plate
- 2 x Gaskets
Installation Notes
- Disconnect the battery and remove the propeller for safety.
- Drain the gearcase lubricant from the lower unit.
- Unbolt and carefully lower the sterndrive's lower unit to access the water pump assembly.
- Remove the bolts securing the water pump housing cover and lift it off.
- Remove the old impeller, gaskets, and wear plate, noting their orientation. Clean all mating surfaces thoroughly.
- Install the new base plate, gaskets, and impeller. Ensure the impeller vanes are turned in the correct direction (typically clockwise) while seating it.
- Install the new seals and O-rings as provided in the kit.
- Reinstall the water pump housing and torque its bolts to the manufacturer's specification.
- Re-attach the lower unit, refill the gearcase with fresh lubricant, and reinstall the propeller.
- Start the engine using a water supply (flushing muffs) and verify water is exiting the tell-tale port, indicating proper pump function.
Troubleshooting & FAQ
How do I confirm this kit fits my Alpha One Gen II?
The key is your sterndrive's serial number. This kit is for MerCruiser Alpha One Gen II drives with serial numbers D469859 and higher, which generally covers models from 1991 onwards. If your serial number is lower, you will require a different kit.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alerts or a high temperature gauge reading, and in some cases, a rattling or grinding noise coming from the lower unit area where the pump is located.
How often should the impeller be replaced?
As a preventative maintenance item, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if the boat is operated frequently in sandy, silty, or saltwater environments.
Is this a single overmolded plate or a three-piece system?
This kit includes a separate base plate and two gaskets, forming a three-piece system (gasket/plate/gasket). This design is a direct replacement for the specified OEM part numbers.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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