Water Pump Kit – Fits Mercury/Mariner 6–15 HP (Replaces 46-42089A5)

Water Pump Kit – Fits Mercury/Mariner 6–15 HP (Replaces 46-42089A5)

This water pump repair kit is designed for Mercury/Mariner 2-Stroke 6–15 HP (1986–Up) and 4-Stroke 8–15 HP (1995–2004) outboard motors with standard gearcases (non-BigFoot models). It provides a reliable solution for maintaining your engine's cooling system.

This kit serves as a direct replacement for Mercury/Mariner part numbers 46-42089A5, 46-42089A4, and 46-42089A3. It is also compatible with select 1998 Force/Sears 9.9–15 HP models.

• Engineered for direct OEM replacement and fit.
• Features a durable metal alloy housing and a neoprene rubber impeller for optimal performance.
• Includes all necessary gaskets, seals, and hardware for a complete overhaul.

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/Mariner 2-Stroke Models

Mercury/Mariner 4-Stroke Models

Force/Sears Models

Technical Specifications

Package Contents

• 1 x Impeller (47-42038-2)
• 1 x Wear Plate (42200)
• 2 x Gasket (27-19202/27-19204-3)
• 2 x Gasket (12-19183)
• 2 x Gasket (19643)
• 1 x Pump Base (46-420T5)
• 1 x Pump Housing (46-42089A2)
• 1 x Retainer (42375)
• 2 x Oil Seal (26-41365-1)
• 2 x Seal (26-33613/26-42133)
• 1 x Screw (10-48408)
• 2 x Washer (12-16448)
• 1 x Quad Ring (25-822236)

Installation Guide

1. Disconnect Power: Disconnect the battery and spark plug wires to prevent accidental starting.
2. Drain Gearcase: Drain the gearcase oil to avoid spills.
3. Remove Lower Unit: Unbolt and carefully lower the gearcase assembly from the outboard.
4. Access the Pump: Locate and remove the bolts securing the water pump housing.
5. Disassemble Old Pump: Remove the old housing, impeller, wear plate, and gaskets. Note the orientation of the old parts.
6. Clean Surfaces: Thoroughly clean the mating surfaces on the gearcase and driveshaft.
7. Install New Components: Install the new gaskets, wear plate, impeller (rotate shaft clockwise), and seals from the kit.
8. Reassemble Housing: Apply a light coat of marine grease to the inside of the new housing and install it over the impeller. Secure with bolts.
9. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Torque bolts to spec.
10. Refill and Test: Refill the gearcase with fresh oil. Reconnect the battery and start the engine in water to verify a strong water stream from the tell-tale outlet.

Troubleshooting & FAQ

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

A: The most reliable method is to match your engine's serial number to the ranges listed in the compatibility tables. The serial number is typically found on a tag on the transom bracket. Use our linked serial number guide for help locating it.

Q: What are the signs that my water pump needs to be replaced?

A: Common indicators include the engine running hotter than normal, an intermittent or weak water stream from the "tell-tale" outlet, and visible cracking or damage to the old impeller upon inspection.

Q: How often should the water pump impeller be replaced?

A: For preventative maintenance, it is highly recommended to replace your impeller every 1-2 years or every 100-200 hours of operation, depending on usage and water conditions (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.