Water Pump Impeller – Fits Mercury/Mariner/Honda 40-300HP (Replaces 47-43026T2)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller
$15.99
$15.99
Subtotal: $15.99

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photo jlm marine water pump impeller for mercury mariner honda 40-300 hp 47-43026t2 black six-blade star-shaped rubber impeller with central grey-lined opening

Water Pump Impeller – Fits Mercury/Mariner/Honda 40-300HP (Replaces 47-43026T2)

$15.99

Water Pump Impeller – Fits Mercury/Mariner/Honda 40-300HP (Replaces 47-43026T2)

$15.99

Water Pump Impeller – Fits Mercury/Mariner/Honda 40-300HP (Replaces 47-43026T2)

This water pump impeller is designed for a wide range of Mercury/Mariner/Honda 40-300HP outboards and MerCruiser sterndrives with applicable water pumps. It serves as a reliable replacement to maintain your engine's cooling system performance.

This part is a direct replacement for Mercury 47-43026T2, Sierra 18-3056, Mallory 9-45037, and EMP 47-01814.

  • Easy to install as a direct replacement part.
  • Features a 6-blade design constructed from durable, heat-resistant rubber.
  • Requires drive key P/N 28-32833 for installation (not included).

Part Number Cross-Reference

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

Brand Part Number
Mercury 47-43026T2
Sierra 18-3056
Mallory 9-45037
EMP 47-01814

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.

Confirm your engine model/year in the table below.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury Outboard 30/40/45/50/60 4-Stroke Bigfoot models 47-43026T2
Mercury Outboard 60 3-cylinder Bigfoot 47-43026T2
Mercury Outboard 75-125 All 3 & 4 cylinder models (s/n A996142 and above) 47-43026T2
Mercury Outboard 75/90/115 47-43026T2
Mercury Outboard 40-250 47-43026T2 Also fits 18-3056 applications
MerCruiser Alpha I-Gen 2 s/n D494569 & above 47-43026T2
MerCruiser Vazer 47-43026T2
Honda Outboard Compatible with Mercury 47-43026T2

Technical Specifications

Specification Value
Product Type Water Pump Impeller
Installation Direct replacement
Housing Material Rubber with metal hub
Dimensions OD: 89mm, ID: 22.4mm, Width: 32.5mm
Number of Blades 6
Key Required Yes (28-32833)
Other Technical Attributes Resistant to heat and wear

Package Contents

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

Installation Guide

  1. Disconnect Power: Disconnect the negative battery cable before starting work.
  2. Access Lower Unit: Remove the bolts securing the lower unit (gearcase) and carefully lower it from the engine's midsection.
  3. Remove Pump Housing: Locate and unbolt the water pump housing cover.
  4. Inspect and Remove Old Impeller: Note the rotational direction of the old impeller's blades before pulling it off the driveshaft. Remove the old drive key.
  5. Clean Surfaces: Thoroughly clean the inside of the pump housing and the base plate, removing any old gasket material or debris.
  6. Install New Impeller: Insert the new drive key into the driveshaft keyway. Lubricate the new impeller with a marine-safe lubricant and slide it onto the shaft, rotating it in the direction of engine operation to correctly orient the blades.
  7. Reassemble Pump: Reinstall the housing and tighten the bolts to the manufacturer's recommended torque.
  8. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure it with the bolts.
  9. Test Operation: Reconnect the battery. With the engine in a water source (using flush muffs or in the water), start it and confirm a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How can I be sure this impeller fits my specific engine model?

A: Check the compatibility table and cross-reference your engine's original part number with the numbers listed (Mercury 47-43026T2, Sierra 18-3056). For Mercury engines, use the serial number guide linked above to verify your model and year range.

Q: What are the signs of a failing water pump impeller?

A: Common signs include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet, and a dry, cracked, or brittle appearance on the old impeller upon inspection.

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

A: For preventative maintenance, it is best practice to replace the impeller every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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