Water Pump Impeller Kit for Mercury/Mariner and MerCruiser Alpha One Gen II – Replaces Mercury 47-43026Q06

Product Details

This water pump impeller kit is designed to service compatible Mercury and Mariner outboard water pumps and selected MerCruiser Alpha One Generation II stern-drive applications. A properly maintained water pump helps circulate cooling water and reduce the risk of overheating. Always confirm the engine or drive model, year, serial-number range, housing style, and the part number of the original component before ordering.

The kit replaces or cross-references Mercury part number 47-43026Q06. Catalog references also associate this application with Mercury 47-43026T11 and 47-8M0100526, and with Sierra 18-3265. These references should be treated as application leads rather than a substitute for checking the complete model and serial-number conditions.

• Aftermarket replacement water pump service kit.
• Neoprene impeller intended for compatible marine cooling-water pump applications.
• Includes the listed gaskets, seals, plate, key, O-rings, and the Alpha One Gen II coupling assembly identified below.
• Designed for direct replacement where the original pump configuration and dimensions match.

Part Number Matrix

Use the following references only after confirming the complete application and component configuration.

Engine and Drive Compatibility

The fitment information below summarizes catalog application guidance for the referenced Mercury number. Model-year and serial-number boundaries can vary by gearcase, water-pump housing, and production change. Do not rely on horsepower alone.

Important: The original listing included Honda applications, but the available product and catalog research did not independently verify those Honda relationships for this kit. Honda fitment should not be assumed from this page; use a Honda-specific catalog or the original Honda part number to confirm a separate application.

Technical Specifications

Product Type

Water pump impeller service kit

Installation

Direct replacement when the original application and dimensions match

Impeller Diameter

88 mm (3.46 in)

Impeller Height

31.31 mm (1.23 in)

Shaft Size

22.25 mm (0.88 in)

Number of Blades

6

Impeller Material

Neoprene rubber

Application Reference

Mercury 47-43026Q06 and related catalog references listed above

What’s in the Box

• 1 × Water pump impeller, reference 47-43026T2
• 1 × Impeller plate, reference 817276
• 1 × Impeller key, reference 28-43037
• 1 × Impeller gasket, reference 27-817277
• 1 × Impeller gasket, reference 27-430331
• 1 × Face seal, reference 26-816575A2
• 1 × Coupling assembly, reference 816597A1, for applicable Alpha One Generation II service configurations
• 4 × O-ring, reference 25-21836

Component references identify the parts listed for this kit and do not independently expand the kit’s application range. Confirm that the included configuration matches the pump being serviced before installation.

Installation Notes

1. Turn off the engine, remove the ignition key, disconnect the battery where appropriate, and place the drive or engine in a safe service position.
2. Follow the manufacturer’s service procedure for removing the lower unit or stern-drive components. Drain gear lubricant only if required by that procedure.
3. Remove the water-pump housing and retain the original component orientation for comparison.
4. Remove the old impeller, key, gaskets, plate, seals, and O-rings as applicable to the pump configuration.
5. Inspect the housing, wear surfaces, shaft, water tube, and mating faces for scoring, corrosion, distortion, or debris.
6. Clean all mating surfaces thoroughly. Do not reuse damaged gaskets, seals, keys, or O-rings.
7. Install the supplied plate, key, impeller, gaskets, and seals in the correct order. Use a marine-safe lubricant compatible with the impeller material.
8. Reinstall the water-pump housing and tighten fasteners to the engine or drive manufacturer’s specified torque.
9. Reinstall the lower unit or stern-drive assembly, ensuring correct alignment of the driveshaft, shift shaft, water tube, and coupling components.
10. Refill the gearcase with the specified lubricant if it was drained.
11. Run the engine only with an appropriate water supply, such as flushing muffs or a test tank, and verify a strong cooling-water discharge before returning the boat to service.

Troubleshooting and FAQ

Safety and Important Information

• Verify the original part, dimensions, images, model, year, and serial number before ordering.
• Do not operate an outboard or stern drive without an adequate water supply.
• Follow the manufacturer’s service manual for torque values, gearcase procedures, and safety requirements.
• Professional installation is recommended when lower-unit or stern-drive service is outside your experience.

About Sea Sierra

• Marine replacement parts selected for common service and maintenance applications.
• Application-focused product information to help customers compare original components and catalog references.
• Support-oriented service for fitment questions and replacement-part selection.