Water Pump Impeller Kit – Fits Mercury/Mariner 30–75 HP Outboards (Replaces 47-19453T, 47-19453)

Water Pump Impeller Kit – Fits Mercury/Mariner 30–75 HP Outboards

This water pump impeller kit is a direct replacement for Mercury/Mariner outboards from 30 to 75 HP (1991–2021) and Force models from 70 to 75 HP. It is designed to restore cooling system performance and prevent engine overheating.

This kit fits a wide range of 2-stroke and 4-stroke engines, including both standard and BigFoot gearcases. It contains all necessary components for a complete water pump service.

• Engineered with a high-quality rubber compound resistant to saltwater degradation for enhanced durability.
• Direct replacement installation requires disassembly of the water pump housing.
• Full kit includes impeller, key, gaskets, plate, and O-ring for a comprehensive 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.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (47-19453T)
• 1 x Impeller Key
• 1 x Plate (19700A2)
• 1 x Guide Tube/Coupler (859770/8597701/893857)
• 2 x Washer (12-858234)
• 1 x Gasket Upper (27-822189)
• 1 x Gasket Lower (27-19701)
• 1 x O-Ring

Installation Guide

1. Safety First: Disconnect the battery and remove the ignition key to prevent accidental starting.
2. Access the Lower Unit: Shift the outboard into neutral. Remove the bolts securing the lower unit (gearcase) to the engine.
3. Remove the Lower Unit: Carefully lower the gearcase away from the midsection. The driveshaft will disengage from the engine.
4. Disassemble the Pump Housing: Locate the water pump assembly on top of the gearcase. Remove the bolts to open the housing and expose the impeller.
5. Replace the Impeller: Note the rotational direction of the old impeller vanes. Remove the old impeller, key, gaskets, and wear plate.
6. Install New Components: Clean all mating surfaces. Install the new gaskets, wear plate, key, and impeller. Ensure the impeller vanes are oriented correctly.
7. Reassemble the Housing: Securely fasten the water pump housing cover with its bolts, tightening them to the manufacturer's specified torque.
8. Reinstall the Lower Unit: Guide the driveshaft back into the crankshaft, ensuring the water tube aligns correctly. Secure the lower unit with its mounting bolts.
9. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and verify a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller kit fits my specific engine?
A: The most reliable method is to match your engine's model, year, and serial number against the compatibility tables provided on this page. For Mercury/Mariner models, serial number ranges are critical for correct fitment. If you are unsure, we recommend checking your OEM service manual or contacting us with your engine details before purchasing.

Q: What are the symptoms of a worn or failed water pump impeller?
A: The most common signs include a weak or non-existent water stream from the "tell-tale" outlet, an engine overheating alarm, or a noticeable decrease in engine performance. Visible damage to the impeller, such as cracked, brittle, or missing vanes, also indicates it's time for a replacement.

Q: How often should the water pump impeller be replaced?
A: As a general maintenance guideline, we recommend replacing the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can vary based on usage conditions, such as operation in sandy or saltwater environments.

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.