Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038Q02, 18-3062)

Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038Q02, 18-3062)

This water pump impeller kit is designed for a precise fit on a range of Mercury, Mariner, and Force outboard engines. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring reliable performance for your cooling system.

This kit fits various 2-stroke and 4-stroke models, specifically Mercury/Mariner 6-15 HP 2-Stroke (1986+), 8-9.9 HP 4-Stroke (up to 2004), 15 HP 4-Stroke (up to 2008), and Force 9.9-15 HP 2-Stroke (1998) engines. Please verify your engine's serial number against the compatibility charts below before ordering.

• Durable Construction: Made from high-quality neoprene rubber with a hardened nylon hub for longevity and performance.
• Direct Replacement Fit: Engineered to meet or exceed OEM specifications for a straightforward installation.
• Complete Kit: Typically includes the impeller, gaskets, and key needed for a standard service.

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 Outboards

2-Stroke Engines

4-Stroke Engines

Force Outboards

Technical Specifications

Package Contents

Packages typically include the following components:

• 1 x Water Pump Impeller (Replaces 47-42038-2)
• 1-2 x Impeller Gaskets (Replaces 27-19202, 27-19204-3). The specific gaskets included can vary by kit.
• 1 x Impeller Key

Explosion Diagram

Installation Guide

1. Disconnect Power: Disconnect the spark plug wires and the battery.
2. Remove Lower Unit: Unbolt and carefully lower the gearcase assembly from the outboard's midsection.
3. Access Pump: Locate and remove the bolts securing the water pump housing.
4. Remove Old Impeller: Lift the housing off and remove the old impeller. Note the direction of the vanes.
5. Inspect & Clean: Clean the housing interior and wear plate. Check for scoring, warping, or damage.
6. Install New Parts: Place the new impeller key on the driveshaft and install the new gasket.
7. Install New Impeller: Slide the new impeller onto the driveshaft, turning the shaft clockwise to bend the vanes correctly.
8. Reassemble Pump: Reinstall the water pump housing and tighten bolts to the specified torque.
9. Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft and water tube align. Securely fasten the bolts.
10. Test Operation: Reconnect the battery and run the engine with a reliable water supply (flushing muffs) to verify a strong water stream from the tell-tale.

Troubleshooting & FAQ

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

A: The most reliable way is to match your engine's serial number to the ranges listed in the compatibility tables above. Serial numbers are critical for Mercury/Mariner models, as fitment can vary even within the same model year.

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

A: Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or a high-temperature warning alarm.

Q: How often should I replace the water pump impeller?

A: For preventative maintenance, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Frequency should increase if you operate in sandy, silty, or saltwater conditions.

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.