Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 & Outboards 40-250 HP (Replaces 47-43026Q06)

Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha 1 Gen 2 & Outboards 40-250 HP (Replaces 47-43026Q06)

This water pump impeller repair kit is designed for a wide range of Mercury/Mariner outboards (40–250 HP, 2-stroke & 4-stroke) and Mercruiser Alpha One Gen 2 stern drives with serial numbers 0D469859 and above.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for engine maintenance and repair.

• Installation Method: Direct OEM replacement.
• Core Component: Includes a high-quality, durable neoprene rubber impeller for reliable performance.
• Complete Kit: Comes with the impeller, plate, gaskets, seals, and other necessary components for a full service.

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 (47-43026Q02)
• 1 x Impeller Plate (817276)
• 1 x Impeller Key (28-8M0032833)
• 1 x Seal Ring Gasket (26-45577)
• 1 x Impeller Gasket (27-817277)
• 1 x Face Seal and Tool (26-816575A2)
• 2 x O-Ring (25-21836)
• 2 x Drain Screw Gasket (26-830749)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is off and cool to the touch.
2. Drain the System: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gear lube.
3. Remove Lower Unit: Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing. Carefully lower the unit.
4. Access the Pump: The water pump is located on top of the lower unit. Remove the bolts securing the pump housing cover.
5. Inspect and Replace: Remove the old impeller, gaskets, and plate. Note the orientation of the old impeller vanes for reference.
6. Install New Components: Clean all surfaces. Install the new plate, gasket, key, and impeller. Lubricate the new impeller and housing interior with a marine-grade grease.
7. Reassemble Pump Housing: Secure the pump cover and tighten the bolts to the manufacturer's specified torque.
8. Reattach Lower Unit: Carefully align the driveshaft and shift shaft, then raise the lower unit back into place. Reinstall the mounting bolts.
9. Refill Gear Lube: Fill the lower unit with the correct type and amount of gear lube according to your engine's service manual.
10. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific engine?

A: The most reliable method is to match your engine's serial number and model to the ranges listed in our compatibility tables. For Mercury/Mercruiser, your serial number is critical. You can also visually compare our product photos with your old parts before ordering.

Q: What are the symptoms of a bad water pump impeller?

A: Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and a high engine temperature alarm. A dry-rotted or damaged impeller cannot pump water effectively.

Q: How often should I replace my water pump impeller?

A: 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 use, depending on operating conditions (saltwater vs. freshwater) and storage practices.

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.