Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 (Replaces 47-43026Q06)
Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 (Replaces 47-43026Q06) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 (Re...
Product Details
This Water Pump Impeller Kit provides all necessary components to repair the water pump on a wide range of Mercury/Mariner outboards (40–250 HP) and Mercruiser Alpha One Gen 2 stern drives (serial number 0D469859 and above). Engineered for reliable performance, it ensures your engine receives proper cooling to prevent overheating.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 47-43026Q06, 47-8M0100526, 47-43026T11, and Sierra 18-3214.
- Designed for direct OEM replacement installation.
- Features a durable, high-quality neoprene rubber impeller for longevity.
- Includes a face seal and installation tool for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026Q06 |
| Mercury | 47-8M0100526 |
| Mercury | 47-43026Q5 |
| Mercury | 47-43026T10 |
| Mercury | 47-43026T11 |
| Mercury | 47-43026T6 |
| Mercury | 47-43026T7 |
| Mercury | 47-43026T8 |
| Sierra | 18-3214 |
| Sierra | 18-3265 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner Outboards: This kit fits a variety of 2-stroke and 4-stroke models from 40 to 300 HP. Please verify your model and serial number range in the table.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | F40-F60 4-Stroke Bigfoot/Command Thrust | 40-60 | 4-Stroke | 47-43026Q06 | |
| Mercury | 60 HP 2-Cycle Bigfoot (S/N 0D000750+) | 60 | 2-Stroke | 47-43026Q06 | |
| Mercury | 70-90 HP 2-Cycle (S/N 0A996142+) | 70-90 | 2-Stroke | 47-43026Q06 | |
| Mercury | 75-115 HP | 75-115 | 4-Stroke | 47-43026Q06 | |
| Mercury | 100-125 HP 2-Cycle (4 cylinder) | 100-125 | 2-Stroke | 47-43026Q06 | Models having pump cover screws without insulators |
| Mercury | 150 EFI | 150 | 4-Stroke | 47-43026Q06 | |
| Mercury | V-200/225/250 (3.0L) | 200-250 | 2-Stroke | 47-43026Q06 | |
| Mercury | Verado 135-175 (4 cylinder) | 135-175 | 4-Stroke | 47-43026Q06 | Various serial number ranges |
| Mercury | Verado 200-300 (6 cylinder) | 200-300 | 4-Stroke | 47-43026Q06 | Various serial number ranges |
For Mercruiser Stern Drives: This kit is designed specifically for Alpha One Generation 2 drives. Note the required serial number range.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Mercruiser | Alpha One Gen 2 | 47-43026Q06 | Serial number 0D469859 and above |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM replacement
- Dimensions
- Impeller: A: 22.40mm, B: 89.00mm, C: 32mm
- Other Technical Attributes
- High-quality neoprene rubber impeller
What’s in the Box
- 1 x Impeller
- 1 x Key
- 1 x Impeller Plate
- 1 x Wear Plate
- 1 x Face Seal and Tool
- 2 x O-Ring
- 1 x Seal Ring Gasket
- 2 x Impeller Gasket
- 2 x Drain Screw Gasket
Installation Notes
- Disconnect the battery and shift the engine into forward gear.
- Remove the lower unit (gearcase) from the outboard motor or stern drive.
- Locate and unbolt the water pump housing cover.
- Remove the old impeller, gaskets, wear plate, and seals. Clean all surfaces thoroughly.
- Install the new wear plate, gaskets, and seals provided in the kit.
- Insert the new impeller key and slide the new impeller into the housing, rotating the driveshaft clockwise to seat the vanes.
- Reinstall the water pump housing and torque bolts to manufacturer specifications.
- Reattach the lower unit, ensuring all connections are secure. Test the engine cooling system before extensive use.
Troubleshooting & FAQ
How do I know if this impeller kit fits my engine?
The surest way is to match your engine's model and serial number against the compatibility table. For Mercruiser Alpha One Gen 2 drives, your serial number must be 0D469859 or higher. For outboards, check the specific HP, stroke, and any serial number notes listed.
What are the signs of a failing water pump impeller?
Common signs include the engine running hotter than normal, a weak or non-existent "telltale" water stream from the engine, and alarms for overheating. Visible damage like cracked, brittle, or missing vanes on the old impeller during inspection also indicates failure.
How often should I replace my impeller?
As a general maintenance rule, it's recommended to inspect the impeller annually and replace it every 1-2 years, or every 100-200 hours of operation, whichever comes first. Usage in saltwater or sandy/silty conditions may require more frequent replacement.
Is the included tool necessary for installation?
The included face seal tool is specifically designed to properly install the seal without damaging it, ensuring a watertight fit. While other methods may exist, using the provided tool is highly recommended for a leak-free repair.
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.
Payment & Security
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