Water Pump Impeller – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038-2, 47-42038Q02)

Water Pump Impeller – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038-2, 47-42038Q02)

This water pump impeller is designed for a precise fit on a wide range of Mercury/Mariner 2-stroke and 4-stroke outboard engines, including models from 6 HP to 15 HP manufactured between 1986 and 2008. It also fits select Force, Chrysler, and Sears 9.9 HP and 15 HP models from 1998.

Engineered as a direct replacement for OEM parts, this impeller ensures reliable performance for your engine's cooling system. The neoprene rubber housing and bonded center insert provide excellent durability and resistance to tearing, maintaining consistent water flow.

• Installation Method: Direct replacement
• Material Construction: High-strength neoprene rubber with a bonded center insert for enhanced durability.
• Primary Function: Circulates water through the engine's cooling system to prevent overheating.

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.

Mercury/Mariner 2-Stroke

Mercury/Mariner 4-Stroke

Force/Chrysler/Sears Outboards

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (47-42038-2/47-42038Q02)

Installation Guide

1. Disconnect the negative battery cable to prevent accidental starting.
2. Place a drain pan under the lower unit and remove the gear case mounting bolts to detach it from the engine.
3. Locate and unbolt the water pump housing cover to expose the old impeller.
4. Carefully note the rotational direction of the existing impeller's vanes before removal.
5. Remove the old impeller, woodruff key, gaskets, and wear plate.
6. Thoroughly clean the interior of the pump housing and all mating surfaces.
7. Install the new wear plate and gasket, ensuring proper alignment.
8. Insert the woodruff key into the driveshaft and slide the new impeller on, twisting it in the same direction as the old one.
9. Apply a thin layer of marine-grade grease to the housing interior and install the new housing gasket.
10. Securely reinstall the water pump housing cover.
11. Re-attach the lower unit to the engine, ensuring the driveshaft and water tube align correctly.
12. Reconnect the battery, start the engine in a water source, and verify a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How can I be sure this impeller fits my Mercury engine?
This impeller is designed for a wide range of Mercury/Mariner 2-stroke (6-15 HP, 1986-2005) and 4-stroke (8-15 HP, 1995-2008) outboards, plus select 1998 Force/Sears models. To ensure a perfect match, please consult the detailed compatibility tables on this page. We strongly recommend using the Mercury serial number guide link provided to verify your specific model and year before purchasing.

What makes this impeller design durable?
The impeller is constructed from a tough neoprene rubber compound designed for longevity in marine environments. The central brass insert is chemically bonded to the flexible vanes, which strongly resists tearing under high RPMs and helps maintain consistent water flow for reliable engine cooling.

How often should I replace my water pump impeller?
For optimal engine protection, we recommend inspecting your impeller annually and replacing it every 1-2 years or every 100-200 hours of operation. Replacement frequency should be increased if you operate in saltwater or in water with high levels of sand or silt.

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.