Water Pump Impeller Kit – Fits Mercury Marine 40-300 HP (Replaces 47-43026T06, 8M0100526)
Water Pump Impeller Kit – Fits Mercury Marine 40-300 HP (Replaces 47-43026T06, 8M0100526) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Kit – Fits Mercury Marine 40-300 HP (Replaces 4...
Water Pump Impeller Kit – Fits Mercury Marine 40-300 HP (Replaces 47-43026T06, 8M0100526) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is designed for a wide range of Mercury Marine 4-Stroke and 2-Stroke outboard engines, from 40 to 300 HP, covering various models from the 1990s to the 2020s. It ensures reliable engine cooling by replacing the original water circulation components.
It serves as a direct interchange for several part numbers, including Mercury 47-43026T06, 8M0100526, 47-43026Q06, Sierra 18-3214, GLM 12042, and Mallory 9-48313.
- Provides a complete solution with impeller, housing, and gaskets.
- Engineered for direct OEM-level replacement and fit.
- Restores critical cooling system performance for engine longevity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026T06 |
| Mercury | 8M0100526 |
| Mercury | 47-43026Q06 |
| Sierra | 18-3214 |
| GLM | 12042 |
| Mallory | 9-48313 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | 40-60 HP EFI | 40-60 | 4-Stroke | 47-43026T06 | BigFoot models |
| Mercury | 60 HP 2-Cycle | 60 | 2-Stroke | 47-43026T06 | BigFoot models (S/N OD000750 & above) |
| Mercury | 70-90 HP | 70-90 | 2-Stroke | 47-43026T06 | S/N 0A996142 & above |
| Mercury | 75-115 HP | 75-115 | 4-Stroke | 47-43026T06 | |
| Mercury | 100-125 HP 4-cyl | 100-125 | 2-Stroke | 47-43026T06 | Models with pump cover screws without insulators |
| Mercury | 135-175 HP | 135-175 | 4-Stroke | 47-43026T06 | |
| Mercury | 200-250 HP 3.0L | 200-250 | 2-Stroke | 47-43026T06 | |
| Mercury | 200-250 HP | 200-250 | 4-Stroke | 47-43026T06 | |
| Mercury | 350 HP Verado | 350 | 4-Stroke | 47-43026T06 | |
| Mercury | Alpha I Gen II | N/A | N/A | 47-43026T06 | S/N 0D469859 & above |
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- OEM Direct Replacement
- Housing Color
- Black
- Fitting Type
- Direct Fit
- Other Technical Attributes
- Cooling system component for water circulation
What’s in the Box
- 1 x Impeller
- 1 x Impeller Key
- 1 x Face Plate
- 1 x Face Seal (26-816575A2)
- 2 x Impeller Gasket (27-817277)
- 1 x Impeller Gasket (27-430331)
- 1 x Seal Ring Gasket (26-45577)
- 2 x O-Ring (25-21836)
- 1 x Housing
Installation Notes
- Disconnect the battery and ensure the engine is completely cool before starting.
- Remove the lower unit (gearcase) from the outboard motor.
- Locate and unbolt the water pump housing, typically held by four bolts.
- Carefully remove the old housing, impeller, wear plate, gaskets, and seals, noting their orientation.
- Clean all mating surfaces thoroughly, removing any old gasket material or corrosion.
- Install the new gaskets, seals, impeller key, and then the impeller into the new housing.
- Slide the new water pump assembly onto the driveshaft. Turn the driveshaft clockwise to help seat the impeller fins correctly.
- Secure the housing with the original bolts and tighten them to the manufacturer's specified torque.
- Reinstall the lower unit, making sure the driveshaft and water tube align properly.
- Reconnect the battery and test the engine in a suitable water source, confirming a strong water stream from the tell-tale port.
Troubleshooting & FAQ
How do I know if my water pump impeller needs replacing?
Common signs include a weak or non-existent water stream from the engine's "tell-tale" outlet, frequent engine overheating alarms, or a melted and deformed old impeller upon inspection. As a preventative measure, we recommend replacement every 1-2 years or 100-200 operating hours.
Will this kit fit my specific model if the year isn't listed?
This kit is designed for broad compatibility based on the part number. The single best way to ensure fitment is to match your existing part number to the ones listed in our Part Number Matrix, or to confirm the OEM part number specified for your engine's serial number range.
What is the most common cause of premature impeller failure?
Running the engine out of water ("running dry"), even for a few seconds, can instantly destroy the rubber impeller. Other common causes include sucking up sand or debris and simple wear and tear from age and hours of use.
Is it necessary to install the included housing?
While you can sometimes replace just the impeller, it is highly recommended to replace the entire assembly, including the housing and wear plate. Grooves and scoring on old housings reduce pumping efficiency and can quickly damage a brand new impeller, leading to repeat failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials, and manufactured in an ISO 9002 facility with batch inspections for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders; any available expedited options will appear at checkout.
Warranty & returns
This part is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window if the part is unused and in its original condition. Please see our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component. Brand names are used for reference only.
- Professional installation is recommended for safety and performance. Incorrect installation can lead to engine damage.
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, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By removing middlemen, we offer fair pricing without compromising on materials or quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
