Water Pump Impeller Repair Kit – Fits Mercury Marine 13.5-25 HP Outboards (Replaces 47-85089T7, 47-85089Q4)

Water Pump Impeller Repair Kit – Fits Mercury Marine 13.5-25 HP Outboards

This aftermarket water pump impeller repair kit is designed for Mercury Marine and Force outboard lower units. It provides the necessary components to restore the engine's cooling system, preventing overheating and potential damage.

This kit is a direct replacement for Mercury part numbers 47-85089T7 and 47-85089Q4. It fits a range of 4-stroke and 2-stroke outboards from 13.5 HP to 25 HP manufactured between 1984 and 2005, as well as specific Force 25 HP models.

• Engine Compatibility: Fits select Mercury Marine (13.5-25 HP) and Force (25 HP) outboard models.
• Core Components: Includes a durable marine-grade CR-Neoprene impeller and a stainless steel (SS316) wear plate.
• Installation Location: Mounts in the lower unit gearcase.

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.

Confirm your engine model/year in the table below.

Mercury Marine

Force

Technical Specifications

Package Contents

• 1 x Impeller (47-85089-3/47-85089-10)
• 1 x Wear Plate (85083)
• 2 x Gaskets (27-993261)

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Shift the outboard into neutral.
3. Remove the propeller and unbolt the lower unit (gearcase) from the upper leg. Carefully lower it to access the water pump.
4. Remove the bolts securing the water pump housing.
5. Slide the housing up and off the driveshaft, exposing the impeller.
6. Remove the old impeller, wear plate, and gaskets. Note the direction of the impeller vanes.
7. Clean all mating surfaces thoroughly.
8. Install the new wear plate and gaskets.
9. Slide the new impeller onto the driveshaft, rotating it clockwise to bend the vanes correctly.
10. Reinstall the water pump housing, ensuring all seals are properly seated.
11. Reattach the lower unit to the outboard leg, making sure the driveshaft and water tube align.
12. Secure all bolts to the manufacturer's specified torque, reconnect the battery, and test the engine with a water supply.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
Start by checking your engine's make, model, HP, and year against the "Compatible Engine Models" table. For Mercury and Force models, it is crucial to also check the serial number range listed in the notes to ensure a correct match.

Does this kit fit 20 HP Mercury models?
Some sources indicate this kit is compatible with 20 HP Mercury models, but a comprehensive year range is not available. We recommend verifying the OEM part number (47-85089T7 or 47-85089Q4) for your specific 20 HP engine before ordering.

What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the engine's "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in engine performance. A brittle or cracked impeller found during inspection also indicates it's time for replacement.

How often should I replace the water pump impeller?
As a general maintenance rule, it is recommended to inspect the impeller annually and replace it every 1-2 years, or after every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

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.