Water Pump Impeller – Fits Mercury/MerCruiser 40-100HP (Replaces 47-43026T2, 47-43026Q02)

Water Pump Impeller – Fits Mercury/MerCruiser 40-100HP (Replaces 47-43026T2, 47-43026Q02)

This water pump impeller is designed for a wide range of Mercury Outboard 4-Stroke engines from 40 to 100 HP (1999–Present) and MerCruiser Alpha One Gen II stern drive applications (1991–Present). It serves as a direct replacement, ensuring reliable performance for your marine engine's cooling system.

It replaces the following OEM and aftermarket part numbers: Mercury 47-43026T2, 47-43026Q02, 8M0025709, 47-430262, 47-43026B2; Sierra 18-3056, 18-3056-10; and GLM 89630.

• Engineered with a Key Drive for a secure fit and reliable power transfer.
• Constructed from high-quality neoprene rubber for enhanced durability and longevity.
• The package includes the impeller and a key for a complete installation.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 47-43026T2/47-43026Q02)
• 1 x Key

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is off and cool. Shift the outboard into neutral.
2. Remove Lower Unit: Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing. Carefully lower and separate the unit.
3. Access the Pump: Locate the water pump housing on top of the lower unit. Remove the bolts holding the housing cover.
4. Inspect and Remove Old Impeller: Lift off the housing. Note the direction the old impeller blades are facing. Pry or pull the old impeller off the driveshaft, and remove the old key.
5. Clean and Prepare: Clean any old gasket material or debris from the housing and wear plate. Lightly lubricate the new impeller and the inside of the housing with a marine-grade grease or soap.
6. Install New Impeller: Place the new key into the driveshaft keyway. Slide the new impeller onto the driveshaft, twisting it in the direction of engine rotation (usually clockwise) to bend the blades correctly into the housing.
7. Reassemble: Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
8. Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Securely tighten the bolts.
9. Test Operation: Reconnect the battery. Start the engine in the water or with a proper flush attachment and verify a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: First, review the detailed compatibility tables on this page. For Mercury/MerCruiser owners, we highly recommend using the official Mercury Serial Number Guide to identify your exact model and year. Cross-referencing your engine's original part number with our list is the most reliable method.

Q: What are the symptoms of a failing water pump impeller?
A: Common signs include the engine running hotter than normal, a weak or intermittent water stream from the tell-tale (pee hole), or a steam/water mix from the exhaust. Ignoring these can lead to severe engine damage from overheating.

Q: How often should the impeller be replaced?
A: As a critical preventative maintenance item, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Q: What is the difference between the 47-43026T2 and 47-43026Q02 part numbers?
A: The 47-43026T2 and 47-43026Q02 part numbers are considered direct service replacements for each other by Mercury. This product is designed to replace both versions and functions identically.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.