Water Pump Impeller – Fits Mercury 40/50/60 HP 4-Stroke EFI Outboards (Replaces 47-19453T)

Water Pump Impeller – Fits Mercury 40/50/60 HP 4-Stroke EFI Outboards (Replaces 47-19453T)

This water pump impeller is designed for Mercury/Mariner 4-Stroke EFI outboards from 40 to 60 HP (4-cylinder models), covering years from the late 1990s through current production models.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and restoring your engine's cooling system performance.

• Installation Type: Direct Replacement
• Key Attribute: Features 6 blades for efficient water circulation
• Compatibility: Designed for standard gearcases on specified Mercury & Mariner 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.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 47-19453T)

Installation Guide

1. Disconnect the negative battery cable to prevent accidental starting.
2. Place the outboard's gear shift into the neutral position.
3. Remove the bolts securing the lower unit (gearcase) to the upper leg of the outboard.
4. Carefully lower and remove the gearcase from the engine.
5. Locate and unbolt the water pump housing, which sits on top of the gearcase.
6. Note the rotational direction of the old impeller's blades before removing it from the drive shaft.
7. Clean any debris or corrosion from the pump housing interior and base plate.
8. Lightly lubricate the new impeller and the inside of the housing with marine grease.
9. Slide the new impeller onto the drive shaft, turning the shaft in its normal rotational direction (typically clockwise) to correctly seat the blades.
10. Reinstall the water pump housing and tighten its bolts to the manufacturer's specified torque.
11. Reattach the lower unit to the outboard, ensuring the drive shaft, shift shaft, and water tube are properly aligned.
12. Reconnect the battery, start the engine, and confirm a steady stream of water from the cooling system's tell-tale outlet.

Troubleshooting & FAQ

Q: How can I confirm this impeller fits my Mercury engine?
A: This impeller fits Mercury/Mariner 40-60 HP 4-cylinder EFI outboards from the late 1990s onward. First, check the 'Compatible Engine Models' table on this page. For absolute certainty, use the Mercury Serial Number guide linked above to identify your exact model and then cross-reference the OEM part number (47-19453T).

Q: What are the signs that my water pump impeller needs replacement?
A: Common signs of a failing impeller include the engine overheating, a weak or non-existent stream of water from the "tell-tale" outlet, or an unusually high engine temperature reading on your gauge.

Q: How often should I replace the water pump impeller?
A: As a general maintenance rule, it's recommended to inspect and/or replace the water pump impeller every 1-2 years or every 100-200 hours of operation, whichever comes first, to prevent overheating and engine damage.

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.