Water Pump Impeller Kit – Fits Mercury/Mariner (Replaces 47-43026T06, 8M0100526)
Water Pump Impeller Kit – Fits Mercury/Mariner (Replaces 47-43026T06, 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 (Replaces 47-43026T0...
Product Details
This Water Pump Impeller Kit provides a reliable, direct-replacement solution for a wide range of Mercury and Mariner outboards from 40 to 300 HP (2-Stroke and 4-Stroke, 1996 models and newer). It is also fully compatible with MerCruiser Alpha One Gen II sterndrives manufactured from 1991 onwards (serial number 0D469859 and above).
Engineered to meet or exceed original equipment standards, this kit serves as a direct interchange for Mercury part numbers 47-43026T06, 8M0100526, and 47-43026Q06, along with several other aftermarket equivalents.
- Engineered for higher flow rates and improved engine cooling performance.
- Includes all necessary gaskets, o-rings, and seals for a complete overhaul.
- Designed for direct, hassle-free installation matching OEM fitment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026T06 / 8M0100526 |
| Mercury | 47-43026Q06 |
| Sierra | 18-3214 |
| GLM | 12042 |
| Mallory | 9-48313 |
| Honda | 06192-ZW1-003 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury and Mariner models, verify the horsepower, stroke, year range, and any applicable serial number notes to ensure a precise match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Bigfoot/Command Thrust | 40-60 | 4-Stroke | 1999–Present | 47-43026T06/8M0100526 | |
| Mercury | Bigfoot | 60 | 2-Stroke | 1999–Present | 47-43026T06/8M0100526 | S/N 0D000750 & above |
| Mercury | Outboard | 70-90 | 2-Stroke | 1996–Present | 47-43026T06/8M0100526 | S/N 0A996142 & above |
| Mercury | Outboard | 75-115 | 4-Stroke | 1999–Present | 47-43026T06/8M0100526 | |
| Mercury | Outboard | 100-125 | 2-Stroke | 1996–Present | 47-43026T06/8M0100526 | 4-cyl models without insulator screws |
| Mercury | EFI | 135-150 | 4-Stroke | 2005–Present | 47-43026T06/8M0100526 | |
| Mercury | Verado 4-cyl | 135-175 | 4-Stroke | 2005–Present | 47-43026T06/8M0100526 | S/N 1B227000-2B576734 |
| Mercury | Verado 6-cyl | 200-300 | 4-Stroke | 2005–Present | 47-43026T06/8M0100526 | With 4.80 dia. torpedo gearcases |
| Mercury | Outboard | 200-250 | 2-Stroke EFI | 1996–2010 | 47-43026T06/8M0100526 | 3.0L models |
| Mercury | OptiMax | 75-125 | 2-Stroke DFI | 1999–2012 | 47-43026T06/8M0100526 | 1.5L 3-cylinder models |
| Mercury | Pro XS | 115 | 4-Stroke | 2016–Present | 47-43026T06/8M0100526 | S/N 2B225488 & above |
| Mercury | Pro XS | 115 | 2-Stroke DFI | 2005–2012 | 47-43026T06/8M0100526 | S/N 1B751825-2B123429 |
| Mercury | OptiMax | 200-225 | 2-Stroke DFI | 1996–2010 | 47-43026T06/8M0100526 | 6-cylinder 2.5L models |
| Mercury | Pro Verado | 200-300 | 4-Stroke | 2016–Present | 47-43026T06/8M0100526 |
For MerCruiser sterndrives, this kit fits Alpha One Generation II drives from 1991 to present with the specified serial number range.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Alpha One Gen II | 1991–Present | 47-43026T06/8M0100526 | S/N 0D469859 & above |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct Replacement
- Other Technical Attributes
- Designed for higher flow rates and improved cooling
What’s in the Box
- 1 x Impeller (47-43026T2)
- 1 x Impeller Key
- 2 x Impeller Gasket (27-817277)
- 1 x Face Seal (26-816575A2)
- 1 x Seal Ring Gasket (26-45577)
- 2 x O-Ring (25-21836)
- 1 x Face Plate
- 1 x Cover
- 1 x Washer
- 1 x Grommets
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Place a drain pan under the gearcase and remove the gearcase oil drain/fill screws to drain the lubricant.
- Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing. Carefully separate the lower unit.
- Locate the water pump housing on top of the gearcase. Remove the bolts to lift the housing cover.
- Slide the old impeller off the driveshaft, noting the orientation of the fins. Remove the impeller key.
- Clean the housing interior and face plate. Replace the face plate and gaskets from the kit.
- Install the new impeller key and slide the new impeller onto the driveshaft, rotating the shaft clockwise to bend the fins correctly.
- Install the new seals and O-rings on the housing cover.
- Reinstall the water pump housing, ensuring a proper seal. Tighten bolts to the manufacturer’s torque specification.
- Reattach the lower unit to the engine, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Refill the gearcase with fresh lubricant before starting the engine.
- Safely start the engine using a water supply (flushing muffs) and verify for a steady stream of water from the tell-tale port.
Troubleshooting & FAQ
How do I know if this impeller kit fits my engine?
The best way to ensure compatibility is to check your engine's model, year, and serial number against the Engine & Model Compatibility tables above. If your OEM part number matches one listed in our Part Number Matrix, it will fit.
What are the signs of a failing water pump impeller?
Common signs include a weak or intermittent water stream from the "tell-tale" outlet, engine overheating alarms, and in severe cases, steam from the exhaust. It's critical to address these symptoms immediately to prevent engine damage.
How often should I replace the water pump impeller?
As a rule of thumb, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions. More frequent replacement may be necessary if you operate in sandy, silty, or saltwater environments.
My old pump housing is scored or melted. Can I still use this kit?
If the inside of the pump housing or the face plate has deep grooves, scoring, or signs of heat damage (warping/melting), you should replace the entire water pump assembly. Installing a new impeller in a damaged housing will lead to premature failure and poor performance.
What are some common installation mistakes to avoid?
The most common mistake is installing the impeller with the vanes bent in the wrong direction. Always rotate the driveshaft clockwise during installation to ensure the fins curve correctly. Also, be sure to use all new gaskets and seals provided and to properly align the water tube and shift shaft during reassembly.
Is this an OEM part or an aftermarket equivalent?
This listing is for an aftermarket replacement part, not an OEM component. It has been engineered to meet or exceed OEM-level specifications using comparable materials and manufactured in an ISO 9002 facility. Each batch is inspected for quality and consistency.
How fast do you ship and what are the costs?
We ship worldwide quickly, with typical transit times between 5 to 15 days. Standard shipping is free for most orders. Expedited shipping options and exact costs are displayed at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year limited 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 unused items in their 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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