Water Pump Impeller Kit – Fits Mercury/Mercruiser 40-300 HP (Replaces 47-43026Q06)

Water Pump Impeller Kit – Fits Mercury/Mercruiser 40-300 HP (Replaces 47-43026Q06)

This complete water pump impeller service kit provides a direct replacement for Mercury/Mercruiser applications, including a new housing. It is designed to fit a wide range of Mercury and Mariner 2-stroke and 4-stroke outboards from 40 HP to 350 HP, as well as Mercruiser Alpha One Gen II stern drives (S/N 0D469859 and above).

As a direct replacement for OEM part number 47-43026Q06 / 8M0100526, this kit ensures reliable performance and fitment. It is also an aftermarket equivalent for Sierra 18-3214, GLM 12042, and Mallory 9-48313.

• Installation Method: Direct replacement for the complete OEM water pump assembly.
• Key Components: Includes the impeller, housing, gaskets, seals, and plates for a comprehensive service.
• Broad Compatibility: Engineered to fit dozens of V6, Verado, and Bigfoot/Command Thrust models.

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.

Mercury/Mariner Outboards

Mercruiser Stern Drives

Technical Specifications

Package Contents

• 1 x Impeller (47-43026T2)
• 1 x Housing
• 1 x Face Seal (26-816575A2)
• 2 x O-Ring (25-21836)
• 1 x Seal Ring Gasket (26-45577)
• 2 x Impeller Gasket (27-817277)
• 1 x Impeller Gasket (27-430331)
• Additional gaskets, wear plates, and hardware as shown in product images.

Installation Guide

1. Safety First: Disconnect the negative battery cable and ensure the engine is off and cool.
2. Access the Pump: Remove the lower unit (gearcase) from the outboard or stern drive.
3. Remove Old Pump: Unbolt and remove the existing water pump housing assembly. Note the orientation of bolts and components.
4. Extract Old Impeller: Carefully take out the old impeller and keyway. Note the direction of the vanes.
5. Clean Surfaces: Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
6. Install New Components: Place the new gaskets, wear plate, and keyway in position.
7. Install New Impeller: Lightly lubricate the impeller and housing interior with marine grease. Install the new impeller by turning the driveshaft clockwise to bend the vanes correctly.
8. Secure Housing: Install the new pump housing and tighten the bolts to the manufacturer's specified torque.
9. Reassemble: Reinstall the lower unit onto the engine.
10. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and verify a strong, steady stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my specific engine?

Check your engine's model and serial number against the "Compatible Engine Models" section. This kit is a direct replacement for OEM part 47-43026Q06, fitting many Mercury/Mariner outboards (40-350 HP) and Mercruiser Alpha One Gen II stern drives with serial numbers 0D469859 and above.

What are the signs of a failing water pump impeller?

Common signs include the engine overheating (especially at idle), a weak or intermittent water stream from the "tell-tale" exhaust port, or finding damaged/brittle vanes on the old impeller during an inspection.

How often should I replace the water pump impeller?

For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval may be shorter for engines used frequently in saltwater or silty conditions.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.