Water Pump Impeller – Fits Mercury Marine 3.9, 6 & 9.8 HP (Replaces 47-22748)

Water Pump Impeller – Fits Mercury Marine 3.9, 6 & 9.8 HP (Replaces 47-22748)

This water pump impeller is designed for Mercury Marine 2-Stroke 3.9 HP, 6 HP (1974-2007) and 4-Stroke 9.8 HP engines. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and reliable performance.

Engineered to meet or exceed original equipment specifications, this component is crucial for maintaining proper engine cooling and preventing overheating.

• Material: High-durability neoprene with a brass hub for corrosion resistance.
• Installation: Direct replacement for the original impeller with no modifications required.
• Blades: Features a 6-blade design for optimal water flow.

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 (47-22748)

Explosion Diagram

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Drain the lower unit gear oil.
3. Remove the bolts securing the lower unit to the engine's upper casing.
4. Carefully lower and remove the lower unit assembly.
5. Locate and unbolt the water pump housing.
6. Remove the old impeller, noting the rotational direction of the old blades.
7. Clean the housing and install the new impeller, ensuring blades are oriented correctly.
8. Reassemble the water pump housing with new gaskets if necessary.
9. Reattach the lower unit, refill the gear oil, and reconnect the battery.
10. Start the engine and verify a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
Verify your engine's model, horsepower, and serial number against the ranges listed in the "Compatible Engine Models" table. Visually comparing the old part to our product photos and specifications is also a reliable confirmation method.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, an engine alarm sounding, or a weak or non-existent water stream from the tell-tale outlet. A visual inspection may reveal cracked, brittle, or broken blades on the old impeller.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to replace the impeller every 1 to 2 years, or every 100-200 hours of use, whichever comes first. This interval can vary based on usage conditions, especially in saltwater or sandy/silty environments.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.