Water Pump Impeller Kit – Fits Mercury/Mariner 40–250HP & MerCruiser Alpha One Gen 2 (Replaces 47-43026Q06, 8M0100526)
Water Pump Impeller Kit – Fits Mercury/Mariner 40–250HP & MerCruiser Alpha One Gen 2 (Replaces 47-43026Q06, 8M0100526) 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/Mariner 40–250HP & MerCr...
Product Details
This aftermarket Water Pump Impeller Kit provides a complete solution for servicing the cooling systems on a wide range of Mercury/Mariner outboards (40–250HP) and MerCruiser Alpha One Gen 2 stern drives. It is designed to restore cooling performance for 4-Stroke BigFoot/Command Thrust models, various 2-Stroke engines, and Alpha One Gen 2 drives from 1991 onward.
This kit serves as a direct replacement for Mercury part numbers 47-43026Q06, 8M0100526, 47-43026Q5, 47-43026T6, 47-43026T7, 47-43026T8, 47-43026T10, 47-43026T11, and Sierra 18-3265.
- Engineered as a direct replacement for original equipment.
- Features a durable neoprene rubber impeller and a stainless steel housing.
- Includes all necessary gaskets, seals, and O-rings made from non-asbestos materials.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026Q06 |
| Mercury | 8M0100526 |
| Mercury | 47-43026Q5 |
| Mercury | 47-43026T10 |
| Mercury | 47-43026T11 |
| Mercury | 47-43026T6 |
| Mercury | 47-43026T7 |
| Mercury | 47-43026T8 |
| 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 40HP to 250HP, including BigFoot, Command Thrust, EFI, and Verado series.
For MerCruiser stern drives, it is compatible with Alpha One Gen 2 models manufactured from 1991 onwards.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | F40-60 BigFoot/Command Thrust | 40-60 | 4-Stroke | 47-43026Q06/8M0100526 | ||
| Mercury/Mariner | 60 BigFoot | 60 | 2-Stroke | From SN 0D000750 | 47-43026Q06/8M0100526 | |
| Mercury/Mariner | 75-115 | 75-115 | 4-Stroke | 47-43026Q06/8M0100526 | ||
| Mercury/Mariner | 150 EFI | 150 | 4-Stroke | 47-43026Q06/8M0100526 | ||
| Mercury/Mariner | 70-90 | 70-90 | 2-Stroke | From SN 0A996142 | 47-43026Q06/8M0100526 | |
| Mercury/Mariner | 100-125 (4 cylinder) | 100-125 | 2-Stroke | 47-43026Q06/8M0100526 | Models with pump cover screws without insulators | |
| Mercury/Mariner | V-200/225/250 | 200-250 | 2-Stroke | 47-43026Q06/8M0100526 | 3.0L engines | |
| Mercury/Mariner | 135-150 | 135-150 | 4-Stroke (Verado) | From SN 1B227000 | 47-43026Q06/8M0100526 | Sierra source |
| Mercury/Mariner | 175 | 175 | 4-Stroke (Verado) | From SN 1B227000 | 47-4z3026Q06/8M0100526 | Sierra source |
| Mercury/Mariner | 200-225 | 200-225 | 4-Stroke (Verado) | From SN 0T980000 | 47-43026Q06/8M0100526 | Sierra source |
| Mercury/Mariner | 250-275 | 250-275 | 4-Stroke (Verado) | From SN 0T801000 | 47-43026Q06/8M0100526 | Sierra source |
| MerCruiser | Alpha One Gen 2 | From 1991 | 47-43026Q06/8M0100526 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct replacement for original equipment
- Housing Material
- Stainless Steel, Neoprene Marine Rubber (Impeller)
- Package Dimensions
- 15.3 × 10.3 × 5.4 cm (6.02 × 4.06 × 2.13 inches)
- Weight
- 190 g (6.7 ounces)
- Gasket Material
- Non-asbestos
What’s in the Box
- 1 x Impeller (47-43026Q02)
- 1 x Impeller Plate (817276)
- 1 x Impeller Key (28-8M0032833)
- 1 x Seal Ring Gasket (26-45577)
- 1 x Impeller Gasket (27-817277)
- 2 x O-ring (25-21836)
- 1 x Oil Seal (26-816575A2)
- 2 x Drain Screw Gasket (26-830749)
- 1 x Face Seal Setting Tool (818769)
Installation Notes
- Disconnect the battery and remove the lower unit from the outboard or stern drive.
- Locate and unbolt the water pump housing.
- Remove the old impeller, gaskets, wear plate, and seals, noting their orientation.
- Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
- Install the new wear plate, gaskets, and seals as provided in the kit.
- Insert the new impeller into the housing, rotating the driveshaft clockwise to bend the vanes into the correct position.
- Reinstall the water pump housing, ensuring all components are properly seated. Torque bolts to manufacturer specifications.
- Reattach the lower unit to the engine and reconnect the battery.
- Start the engine using a reliable water supply (flushing muffs or in water) and verify a strong, consistent water stream from the telltale outlet.
Troubleshooting & FAQ
How do I know if this impeller kit fits my specific engine?
This kit fits a broad range of Mercury/Mariner outboards (40-250HP) and MerCruiser Alpha One Gen 2 stern drives. The best way to confirm is by checking your engine's model, serial number, and year against the compatibility chart on this page. Cross-referencing your old part number with our Part Number Matrix is also highly recommended.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the "telltale" outlet, and visible cracks, stiffness, or damage to the old impeller's rubber vanes upon inspection.
How often should the water pump impeller be replaced?
As a critical preventive maintenance item, we recommend replacing the impeller every 1-2 years or every 100-200 hours of operation. Intervals can vary based on usage conditions (e.g., saltwater vs. freshwater, high-debris environments). Always consult your engine's service manual for the manufacturer's recommended schedule.
Do I need special tools for installation?
While an experienced mechanic can perform the replacement with standard hand tools, a torque wrench is essential for correctly tightening housing bolts to prevent leaks or damage. This kit also includes a face seal setting tool. Always follow the procedures outlined in your engine's official service manual for safety and accuracy.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9001 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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