Water Pump Impeller Kit – Fits Mercury, Mariner, Force, Sears 6-15 HP (Replaces 46-42089A5)

Water Pump Impeller Kit – Fits Mercury, Mariner, Force, Sears 6–15 HP (Replaces 46-42089A5)

This water pump impeller service kit is designed for Mercury/Mariner 6–15 HP 2-Stroke (1986 and newer) and 8–15 HP 4-Stroke (1995–2004) outboard motors. It also fits select Force and Sears 9.9–15 HP engines from the 1998 model year.

This kit serves as a direct replacement for Mercury OEM part numbers 46-42089A5, 46-42089A4, and 46-42089A3, as well as aftermarket parts GLM 12051 and SEI Marine 96-261-01K. Please verify your engine's serial number for correct fitment.

• Complete Service Kit: Includes a new neoprene impeller, pump housing, wear plate, gaskets, seals, and all necessary hardware for a full rebuild.
• Engine Compatibility: Fits standard gear cases only; not compatible with Bigfoot models.
• High-Quality Materials: Features a durable neoprene impeller for reliable water flow and a housing constructed from high-quality metal alloy for corrosion resistance.

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/Sears

Technical Specifications

Package Contents

• 1 x Impeller (47-42038-2)
• 1 x Wear Plate (42200)
• 1 x Gasket (27-19202)
• 1 x Gasket (27-19204-3)
• 1 x Gasket (12-19183)
• 1 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. Safety First: Disconnect the battery and spark plug wires to prevent accidental starting.
2. Access the Lower Unit: Drain the gearcase oil. Remove the bolts securing the lower unit (gearcase) to the upper engine housing and carefully lower it.
3. Disassemble the Water Pump: Unbolt and remove the water pump housing. Take note of the order of all components (seals, gaskets, impeller, keyway).
4. Inspect and Clean: Clean all surfaces where gaskets will sit. Inspect the housing and wear plate for scoring, warping, or corrosion.
5. Install New Components: Lightly grease the new gaskets and seals. Slide the new impeller into the housing while turning the driveshaft clockwise to bend the vanes correctly.
6. Reassemble: Reinstall the pump housing, ensuring all parts are aligned. Torque the bolts to the manufacturer's specification.
7. Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Securely tighten the mounting bolts.
8. Final Checks: Refill the gearcase with fresh oil. Reconnect the spark plug wires and battery. Test the engine in water, ensuring a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

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

A: The most reliable method is to match your engine's serial number to the ranges listed in the compatibility tables. This kit is for standard gearcases only and will not fit "Bigfoot" models. If unsure, check your current part numbers against our cross-reference list.

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

A: Common signs include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet port, and a melted or brittle appearance of the old impeller's rubber vanes upon inspection.

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

A: For preventative maintenance, it is recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of use, depending on operating conditions (especially in saltwater or sandy/silty water).

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.