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

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

This water pump impeller repair kit is designed for a broad range of Mercury/Mariner outboards and Mercruiser sterndrives. It fits various 2-stroke and 4-stroke outboard models from 40 HP to 250 HP (1998 and newer) and all Mercruiser Alpha One Gen 2 sterndrives with serial numbers 0D469859 and above.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 47-43026Q06, 47-8M0100526, 47-43026Q5, 47-43026T6, 47-43026T7, 47-43026T8, 47-43026T10, 47-43026T11, and Sierra 18-3214/18-3265.

• Includes a high-quality neoprene rubber impeller with a durable plastic hub for efficient cooling and long service life.
• Engineered as a complete, direct-fit replacement for the original water pump components.
• Kit contains multiple gaskets and coupling assemblies to accommodate various engine configurations.

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 (47-43026T2/18-3056)
• 1 x Impeller Plate (8172761/18-3122)
• 1 x Gasket - Face Impeller Plate to Cover (27-43033)
• 1 x Gasket - Gearcase Cover (27-43047)
• 2 x Gasket - Face Plate to Water Pump (27-8172771)
• 2 x Water Pump Face Seal Tool (26-8M2014338) (Note: Inclusion of this tool may vary - please verify at time of purchase)
• 2 x O-Ring (25-21837)
• 1 x Quad Ring (26-45577-1)
• 1 x Impeller Key (28-43037)
• 1 x Slinger Seal (26-816575A-2)
• 1 x Coupling Assembly for Mercruiser Stern Drives (816597A-1)
• 1 x Coupling Assembly/Tube for Mercury Outboard Lower Unit (8M0036238)
• 1 x Coupling/Tube Assembly for Mercury Outboard Lower Unit (22-887987A1)

Note: This comprehensive kit includes multiple coupling assemblies, tubes, and gaskets to fit various engine configurations. Please confirm parts against your model's requirements before installation.

Installation Guide

1. Disconnect the battery and drain the gearcase lubricant.
2. Unbolt and remove the lower unit from the driveshaft housing.
3. Carefully remove the mounting bolts from the water pump housing.
4. Lift the housing off the driveshaft. Remove the old impeller, gaskets, and wear plate.
5. Clean all mating surfaces of any old gasket material or debris.
6. Install the new wear plate and gaskets provided in the kit.
7. Lightly grease the new impeller and slide it onto the driveshaft, rotating it clockwise to seat the blades correctly.
8. Install the new pump housing and tighten the bolts to the manufacturer's specified torque.
9. Reinstall the lower unit onto the driveshaft housing and secure it.
10. Refill the gearcase with fresh lubricant to the proper level.
11. Reconnect the battery and test the engine using a water supply (flushing muffs) to ensure proper water flow.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: Check your engine's model and serial number. This kit fits Mercruiser Alpha One Gen 2 drives with serial numbers 0D469859 and above, and a wide range of Mercury/Mariner outboards from 40-250 HP manufactured from 1998 onwards. Refer to our detailed compatibility tables above for specific model and serial number ranges.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and a dry, cracked, or brittle appearance of the old impeller upon inspection.

Q: How often should the water pump impeller be replaced?
A: For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use. Replacement frequency may depend on operating conditions (e.g., saltwater vs. freshwater use).

Q: Why are there extra parts included in the kit?
A: This kit is designed to cover a wide range of models. It includes multiple gaskets and coupling assemblies to ensure compatibility with different Mercury outboards and Mercruiser sterndrives. Use only the components that match your original parts and discard the unused ones.

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.