Water Pump Impeller Repair Kit – Fits Mercury/Mariner & MerCruiser Alpha One Gen 2 (Replaces 8M0100526, 47-43026Q06)

$29.99

Shipping calculated at checkout.

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.

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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

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.

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.