8M0100526 Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruiser Alpha One Gen 2 Stern Drives 47-43026Q06
8M0100526 Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruiser Alpha One Gen 2 Stern Drives 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
8M0100526 Water Pump Impeller Kit for Mercury Mariner Outboards and...
Product Details
This Water Pump Impeller Kit provides a comprehensive solution for servicing the cooling systems on Mercury/Mercruiser Alpha 1 Gen 2 drives (serial number 0D469859 and up) and a wide range of Mercury/Mariner outboards from 40 to 250 HP (1998 and newer). It is designed to restore cooling performance and prevent engine overheating caused by a worn or damaged impeller.
The kit serves as a direct replacement for several OEM and aftermarket part numbers, including Mercury 47-43026Q06, 47-8M0100526, 47-43026T6/T7/T8/T10/T11, and Sierra 18-3214/18-3265.
- Engineered for direct OEM replacement, ensuring proper fit and function.
- The high-quality neoprene rubber impeller with a plastic hub offers excellent durability and efficient cooling.
- Includes all necessary gaskets, seals, and hardware for a complete overhaul.
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 | 47-43026T6 |
| Mercury | 47-43026T7 |
| Mercury | 47-43026T8 |
| Mercury | 47-43026T10 |
| Mercury | 47-43026T11 |
| Sierra | 18-3214 |
| Sierra | 18-3265 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner Outboards: Fitment is specific to horsepower, year, and sometimes serial number. This kit fits various 2-stroke and 4-stroke models from 40 HP to 300 HP manufactured from 1998 onwards.
For Mercruiser Stern Drives: This kit is compatible with all Alpha One Gen 2 drives with serial numbers 0D469859 and higher, regardless of the engine configuration.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | F40-F60 BigFoot/Command Thrust | 40-60 | 4-Stroke | 1998+ | 47-43026Q06 | |
| Mercury | BigFoot | 60 | 2-Stroke | S/N 0D000750+ | 47-43026Q06 | |
| Mercury | Standard | 70-90 | 2-Stroke | S/N 0A996142+ | 47-43026Q06 | |
| Mercury | Standard | 75-115 | 4-Stroke | 2000+ | 47-43026Q06 | |
| Mercury | 4-Cyl | 100-125 | 2-Stroke | 2000+ | 47-43026Q06 | Models with pump cover screws without insulators |
| Mercury | EFI | 150 | 4-Stroke | 2000+ | 47-43026Q06 | |
| Mercury | V6 (3.0L) | 200-250 | 2-Stroke | 1998+ | 47-43026Q06 | |
| Mercury | Verado (4 Cyl) | 135-175 | 4-Stroke | 2006+ | 47-43026Q06 | Various serial number ranges |
| Mercury | Verado (6 Cyl) | 200-300 | 4-Stroke | 2006+ | 47-43026Q06 | Models with 4.80" torpedo gear cases |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercruiser | Alpha One Gen 2 | N/A | N/A | S/N 0D469859+ | 47-43026Q06 | All engine configurations with Alpha One Gen 2 drive |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM replacement
- Housing Material
- Metal alloys (faceplate)
- Impeller Material
- Neoprene rubber
- Dimensions
- Impeller: 22.25 mm (shaft insert) × 87.92 mm (diameter) × 31.97 mm (height)
- Weight
- 67 g (impeller only) / 330 g (full kit) (0.73 lb)
- Number of Blades
- 6
- Other Technical Attributes
- High-quality neoprene rubber impeller with plastic hub for durability and cooling efficiency
What’s in the Box
- 1 x Impeller (47-43026T2/18-3056)
- 1 x Impeller Plate (8172761/18-3122)
- 1 x Gasket - Face Impeller Plate to Cover (27-43033)
- 1 x Gasket - Gearcase Cover (27-43047)
- 2 x Gasket - Face Plate to Water Pump (27-8172771)
- 2 x Water Pump Face Seal Tool (26-8M2014338)
- 2 x O-Ring (25-21837)
- 1 x Quad Ring (26-45577-1)
- 1 x Impeller Key (28-43037)
- 1 x Slinger Seal (26-816575A-2)
- 1 x Coupling Assembly for Mercruiser Stern Drives (816597A-1)
- 1 x Coupling Assembly/Tube for Mercury Outboard Lower Unit (8M0036238)
- 1 x Coupling/Tube Assembly for Mercury Outboard Lower Unit (22-887987A1)
Installation Notes
- Disconnect the battery and ensure the engine is off and cool.
- For outboards, shift into forward gear to ease driveshaft alignment during reassembly.
- Drain the gearcase lubricant from the lower unit.
- Remove the bolts securing the lower unit (gearcase) to the engine midsection.
- Carefully lower the gearcase to expose the water pump housing.
- Remove the water pump housing bolts and lift the housing to access the impeller.
- Remove the old impeller, gaskets, seals, and faceplate. Clean all mating surfaces thoroughly.
- Install the new components from the kit in reverse order. Lightly lubricate the new impeller with mild soap or water.
- Ensure the impeller key is correctly seated and rotate the driveshaft clockwise while sliding the housing down to set the vanes correctly.
- Reassemble the lower unit, refill with fresh gear lube, and test the engine with a water supply.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
The most reliable way is to match your engine's model, year, and serial number against the compatibility tables above. For Mercruiser, fitment is determined by the drive serial number (Alpha One Gen 2, S/N 0D469859+). For outboards, check your HP, year, and specific model details.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or no water stream from the "telltale" outlet, engine overheating alerts or running hotter than usual at idle or low speeds, and a melted or brittle impeller upon inspection. Reduced cooling can cause severe engine damage.
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 use, whichever comes first. Service intervals may be shorter for boats operated in saltwater or sandy/silty conditions.
Why are there extra or different-looking parts in the kit?
This kit is designed to cover a wide range of Mercury and Mercruiser models. It includes multiple coupling assemblies and tubes to ensure compatibility with different lower unit configurations. Use the parts that match your original equipment and discard the unused ones.
Is the face seal installation tool always included?
The kit includes two Water Pump Face Seal Tools (part 26-8M2014338) to assist with proper seal installation. However, kit contents from different suppliers can vary. Always verify the contents upon receipt.
What’s the difference between this kit and the OEM version?
This aftermarket kit is engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, material quality, and performance. The primary differences are the brand name and price. It provides a reliable and cost-effective alternative to the OEM part.
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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