Water Pump Impeller for Mercury / Johnson / Evinrude Impeller 20 HP (200) 47-89982

Water Pump Impeller – Fits Mercury/Mariner 20HP (Replaces 47-89982)

This water pump impeller is engineered to fit Mercury/Mariner 20HP 2-Stroke outboard motors (model 200) manufactured between 1970 and 1981. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring reliable performance for your engine's cooling system.

Built with a durable neoprene body and a robust bronze hub, this impeller is designed to meet or exceed original equipment specifications for fit and function.

• Engineered for direct replacement of the original impeller.
• Features a 6-blade design for efficient water circulation.
• Constructed from high-quality neoprene with a corrosion-resistant bronze hub.

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. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (47-89982)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable to prevent accidental starting.
2. Place a drain pan under the lower unit and remove the gearcase oil drain plug to empty the oil.
3. Remove the bolts securing the lower unit (gearcase) to the outboard's upper housing.
4. Carefully lower and separate the gearcase from the driveshaft housing.
5. Locate and unbolt the water pump housing, which is typically on top of the gearcase.
6. Lift the housing to expose the old impeller. Note the rotational direction of the existing blades.
7. Slide the old impeller off the driveshaft, removing any old gaskets and cleaning the mating surfaces thoroughly.
8. Install the new impeller onto the driveshaft. Turn the driveshaft clockwise while pushing down to correctly orient the blades.
9. Reinstall the water pump housing with new gaskets, ensuring a proper seal.
10. Reattach the lower unit to the upper housing, ensuring the driveshaft and water tube align correctly.
11. Tighten all bolts to the manufacturer's specified torque.
12. Refill the gearcase with fresh marine gear oil before operating the engine.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Mercury engine?

A: Check your engine's model, year, and serial number against the "Compatible Engine Models" table. This impeller fits Mercury 20HP (200 series) 2-stroke engines made between 1970 and 1981 with specific USA, Australian, Belgian, or Canadian serial numbers as listed.

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

A: Common signs include the engine overheating, an alarm sounding, or a weak/non-existent water stream from the "tell-tale" outlet. Upon inspection, visible damage like cracks, brittleness, or missing blades indicates immediate replacement is needed.

Q: How often should the impeller be replaced?

A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years. Frequency depends on hours of use and the operating environment (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.