Water Pump Impeller Repair Kit – Fits Mercury/Mariner & MerCruiser Alpha One Gen 2 (Replaces 8M0100526, 47-43026Q06)
Water Pump Impeller Repair Kit – Fits Mercury/Mariner & MerCruiser Alpha One Gen 2 (Replaces 8M0100526, 47-43026Q06) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit – Fits Mercury/Mariner & MerCrui...
Water Pump Impeller Repair Kit – Fits Mercury/Mariner & MerCruiser Alpha One Gen 2 (Replaces 8M0100526, 47-43026Q06) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit is engineered for a broad range of Mercury/Mariner outboards from 40-250 HP and MerCruiser Alpha One Generation 2 stern drives (s/n 0D469859+). It provides a complete solution for servicing your engine's cooling system, including the housing, impeller, gaskets, and seals, ensuring reliable performance and preventing overheating.
This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 8M0100526, 47-43026Q06, Sierra 18-3265, and Honda 19021-ZW1-003.
- Engineered for direct, hassle-free installation.
- The housing is constructed from a high-quality, corrosion-resistant metal alloy, and the impeller is made of high-performance neoprene rubber for durability.
- Includes all essential components for a complete rebuild, including impeller, wear plate, gaskets, and seals.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 8M0100526 |
| Mercury | 47-43026Q06 |
| Mercury | 47-43026Q5 |
| Mercury | 47-43026T6 / T7 / T8 / T10 / T11 |
| Sierra | 18-3265 |
| Honda | 19021-ZW1-003 |
| GLM | 12042 / 12043 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Mercury/Mariner Outboards: This kit fits a wide variety of 2-stroke and 4-stroke models. Note serial number ranges and specific configurations like BigFoot, Command Thrust, and Verado gearcases.
MerCruiser Stern Drives: Specifically designed for Alpha One Gen 2 drives manufactured after serial number 0D469859.
Force Outboards: Cross-references to some legacy Chrysler/Force applications are listed in the Part Number Matrix.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | F40-F60 | 40-60 | 4-Stroke | 8M0100526 | BigFoot/Command Thrust models |
| Mercury | 60 | 60 | 2-Stroke | 8M0100526 | BigFoot models (serial number 0D000750 and above) |
| Mercury | 75-115 | 75-115 | 4-Stroke | 8M0100526 | |
| Mercury | 70-90 | 70-90 | 2-Stroke | 8M0100526 | Serial number 0A996142 and above |
| Mercury | 100-125 | 100-125 | 2-Stroke | 8M0100526 | 4-cylinder models with pump cover screws without insulators |
| Mercury | 150 EFI | 150 | 4-Stroke | 8M0100526 | |
| Mercury | V-200/225/250 | 200-250 | 2-Stroke | 8M0100526 | 3.0L engines |
| Mercury | Verado | 4-Stroke | 8M0100526 | 4-cylinder and 6-cylinder models with 4.80 dia. torpedo gearcases | |
| Mariner | Various | 40-250 | 2 & 4-Stroke | 47-43026Q06 | Same applications as Mercury |
| MerCruiser | Alpha One Gen 2 | 8M0100526 | Serial number 0D469859 and above |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement
- Housing Material
- High-quality marine and chemical corrosion resistant metal alloy
- Impeller Material
- High performance neoprene rubber
- Kit Dimensions
- 4.76 x 4.09 x 2.2 inches (120.9 x 103.9 x 55.9 mm)
- Kit Weight
- 8.2 ounces (232.5 g)
- Impeller Blades
- 6
- Impeller Diameter
- 87.92 mm (external)
- Impeller Height
- 31.97 mm
- Impeller Shaft Insert Diameter
- 22.25 mm (internal)
What’s in the Box
- 1 x Neoprene Impeller
- 1 x Wear Plate
- 1 x Gasket (impeller plate to cover)
- 1 x Gasket (gearcase cover)
- 1 x Key
- 1 x Oil Seal
- 2 x O-ring
- 1 x Grommet
- 2 x Washer
Installation Notes
- Disconnect the battery and remove the propeller for safety.
- Drain the gearcase oil from the lower unit.
- Unbolt and carefully lower the gearcase from the outboard midsection.
- Remove the old water pump housing, impeller, and all associated gaskets, seals, and wear plates.
- Clean the mounting surfaces thoroughly, ensuring no old gasket material remains.
- Assemble the new kit components in reverse order, starting with the wear plate, gaskets, and new impeller. Lightly grease the impeller and housing interior.
- Align the driveshaft splines and reinstall the gearcase, ensuring the water tube is properly seated.
- Tighten all bolts to manufacturer-specified torque values.
- Refill the gearcase with fresh oil and reinstall the propeller.
- Start the engine using a water supply (flushing muffs) and verify water is exiting the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine model?
The best way is to match your engine's serial number against the ranges provided in the Engine Compatibility table. Also, visually compare your existing water pump housing and impeller to the images in this listing. For MerCruiser Alpha One drives, the serial number cutoff (0D469859 and above) is the critical identifier.
What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and a noticeable drop in water pressure on your gauges. A dry, cracked, or deformed impeller during a visual inspection also indicates it's time for a replacement.
How often should I replace my engine's water pump impeller?
As a general maintenance guideline, it is recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval may be shorter if you frequently operate in sandy or debris-heavy water.
Is the housing in this kit metal or plastic?
This kit includes a durable, high-quality metal alloy housing designed to resist corrosion in both freshwater and saltwater environments, offering a robust alternative to some plastic OEM housings.
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.
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