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

Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP Outboards

This water pump impeller kit is designed for a range of Mercury/Mariner 2-stroke and 4-stroke outboard engines from 6 to 15 HP, as well as select 1998 Force 9.9-15 HP models. Please see the detailed compatibility tables below to verify your specific engine model and serial number range.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 47-42038-2 and Sierra 18-3062, ensuring a proper fit and restoration of your engine's cooling system.

• Material: Durable neoprene impeller for reliable performance.
• Complete Kit: Includes the impeller, two gaskets, and an impeller key for a full service.
• Installation: Designed for direct replacement of the original components.

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

Force

Technical Specifications

Package Contents

• 1 x Neoprene Impeller (47-42038-2)
• 1 x Gasket (27-19202)
• 1 x Gasket (27-19204-3)
• 1 x Impeller Key

Explosion Diagram

Installation Guide

1. Disconnect the battery and spark plug wires for safety.
2. Drain the lower unit gear lube.
3. Remove the bolts securing the lower unit to the upper casing and carefully lower it.
4. Remove the water pump housing bolts and lift the housing.
5. Take note of the old impeller's vane direction before removing it. Slide the old impeller and key off the driveshaft.
6. Clean the housing interior and inspect it for wear or damage.
7. Install the new impeller key and slide the new impeller onto the driveshaft, rotating it in the direction of engine operation to seat the vanes.
8. Install the new gaskets and reassemble the pump housing, torquing bolts to manufacturer specifications.
9. Reinstall the lower unit, ensuring the water tube and shift shaft are correctly aligned.
10. Refill the gear lube, reconnect the battery and spark plugs, and test operation in water.

Troubleshooting & FAQ

How do I confirm this impeller fits my Mercury engine?
The most reliable method is to check your engine's serial number. Our compatibility table lists the correct serial number ranges this kit is designed for (e.g., "Serial A197112 & Up"). You can find your serial number on a tag on the engine's transom bracket. Use our Mercury Serial Number Guide for help locating it.

How often should the water pump impeller be replaced?
For optimal engine protection, it is recommended to inspect the impeller annually and replace it every 1-2 years, or after every 100-200 hours of use. Replacement frequency should be increased if you operate in sandy, silty, or saltwater conditions.

What are the signs of a failing impeller?
A weak or intermittent "telltale" water stream, an engine overheating alarm, or a noticeable decrease in engine performance are common indicators that the impeller may be worn or damaged and requires inspection or replacement.

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.