Water Pump Impeller Repair Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 & Outboards 40-300HP (Replaces 47-43026Q06, 8M0100526)
Water Pump Impeller Repair Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 & Outboards 40-300HP (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 Repair Kit – Fits Mercury/Mercruiser Alpha 1 Ge...
Product Details
This complete Water Pump Impeller Repair Kit provides all necessary components to service the lower unit water pump on a wide range of Mercury/Mercruiser engines. It is designed for Mercury Mariner 4-stroke 40-60HP BigFoot/Command Thrust models, 2-stroke 60-125HP outboards, V-200/225/250 3.0L models, all Verado 135-300HP outboards, and MerCruiser Alpha One Gen II sterndrives.
It directly replaces Mercury part numbers 47-43026Q06 and 8M0100526, and serves as an interchange for Sierra 18-3214 and 18-3265, among others.
- Installation requires removing the lower unit (gearcase) to access the water pump housing.
- The impeller is made from advanced elastomers, ensuring flexibility and durability across a wide range of marine operating temperatures.
- Kit components are made from stainless steel, neoprene, and composite materials to match OEM standards.
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 | 18-3214 |
| Sierra | 18-3265 |
Engine & Model Compatibility
Confirm your engine model and serial number in the tables below.
This kit fits a wide variety of Mercury outboards from 40HP to 300HP, including many BigFoot, Command Thrust, and Verado models. Check your serial number to ensure a correct match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | F40-60 | 40-60 | 4-Stroke | BigFoot/Command Thrust | 47-43026Q06/8M0100526 | |
| Mercury | BigFoot | 60 | 2-Stroke | S/N 0D000750 & up | 47-43026Q06/8M0100526 | |
| Mercury | Various | 70-90 | 2-Stroke | S/N 0A996142 & up | 47-43026Q06/8M0100526 | |
| Mercury | Various | 75-115 | 4-Stroke | All compatible | 47-43026Q06/8M0100526 | |
| Mercury | Various | 100-125 | 2-Stroke | 4-cylinder models | 47-43026Q06/8M0100526 | With non-insulated pump cover screws |
| Mercury | V-200/225/250 | 200-250 | 2-Stroke | 3.0L models | 47-43026Q06/8M0100526 | |
| Mercury | Verado | 135-150 | 4-Stroke | 4-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
| Mercury | Verado | 175 | 4-Stroke | 4-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
| Mercury | Verado | 200-225 | 4-Stroke | 6-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
| Mercury | Verado | 250-275 | 4-Stroke | 6-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
| Mercury | Verado | 300 | 4-Stroke | 6-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
| Mercury | Verado Pro | 200-300 | 4-Stroke | 6-Cyl models | 47-43026Q06/8M0100526 | With 4.80 dia. torpedo gear cases |
For sterndrives, this kit is compatible with MerCruiser Alpha One Gen II drives from serial number 0D469859 and up.
| Brand | Model | Years | OEM Part No. |
|---|---|---|---|
| Mercruiser | Alpha One Gen II | S/N 0D469859 & up | 47-43026Q06/8M0100526 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement requiring removal of lower unit
- Housing Material
- Varies by component (stainless steel, neoprene, composite materials)
- Housing Color
- Black/metallic
- Dimensions
- OEM-matching dimensions for specified applications
- Weight
- 0.25 kg (8.6 oz)
- Fitting Type
- Direct mechanical fit to drive shaft
- Thread Size
- OEM-matching
- Operating Temperature
- Marine operating temperature range
- Warranty
- 1 year (varies by manufacturer)
- Other Technical Attributes
- Impeller elastomers provide improved flexibility across broad temperature ranges throughout the boating season
What’s in the Box
- 1 x Impeller (47-43026Q02)
- 1 x Wear Plate (817276)
- 1 x Impeller Key (28-8M0032833)
- 1 x Seal Ring Gasket (26-45577)
- 1 x Impeller Gasket (27-817277)
- 1 x Face Seal and Tool (26-816575A2)
- 2 x O-Ring (25-21836)
- 1 x Grommet
- 2 x Washer
- 2 x Drain Screw Gasket (26-830749)
Installation Notes
- Disconnect the battery and ensure the engine is in the off position.
- Place a suitable container under the gearcase and drain the lubricant.
- Remove the lower unit (gearcase) from the sterndrive or outboard.
- Unbolt and carefully remove the water pump housing. Note the orientation of all parts.
- Remove the old impeller, gaskets, wear plate, and seals from the housing and driveshaft.
- 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.
- Slide the new impeller onto the driveshaft, aligning it with the keyway and installing the new key.
- Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
- Reattach the lower unit to the engine assembly.
- Refill the gearcase with the correct type and amount of fresh lubricant.
- Before regular operation, connect a water supply and briefly run the engine to verify proper water flow and check for leaks.
Troubleshooting & FAQ
How can I confirm this kit fits my specific engine?
The most reliable method is to match your engine's model and serial number against the compatibility tables above. This kit fits a broad range of models, but serial number breaks are critical for ensuring correct fitment, particularly for MerCruiser Alpha One Gen II drives (S/N 0D469859 and up) and certain Mercury outboards.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or an alarm from your engine's warning system. A decrease in your water pressure gauge reading is also a key indicator.
How often should a water pump impeller be replaced?
As a preventative maintenance item, it's recommended to replace the impeller every 1 to 2 years, or every 100-200 hours of operation. If you frequently operate in sandy, silty, or saltwater conditions, more frequent inspection and replacement may be necessary.
What's the difference between this and an OEM kit?
This is an aftermarket replacement part, not an OEM component. It is engineered to meet or exceed original equipment specifications using comparable high-quality materials like durable neoprene and stainless steel. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure reliable performance and fit.
How fast is shipping?
We ship worldwide quickly—typical transit time is 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be presented at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. Please see our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety, proper function, and to prevent damage to your engine.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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