Water Pump Impeller Kit with Housing – Fits MerCruiser Alpha & Bravo Engines (Replaces 46-807151A14, 807151A7)

Water Pump Impeller Kit with Housing – Fits MerCruiser Alpha & Bravo Engines (Replaces 46-807151A14, 807151A7)

This water pump impeller kit with housing is designed for MerCruiser Alpha and Bravo sterndrives and various inboard engines from 1987 to 2016. It is compatible with models that use a one-piece plastic, engine-mounted sea water pump assembly, including V6 and V8 engines such as the 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L.

This kit is a direct replacement for MerCruiser part numbers 46-807151A14 and 46-807151A7. It also replaces popular aftermarket parts, including Sierra 18-3150, Quicksilver 807151A14, GLM 12088, and Mallory 9-48350.

• Complete Assembly: Includes the housing, impeller, wear plate, O-rings, and installation bolts for a full replacement.
• Durable Construction: The housing is manufactured from a high-strength, two-step phenolic resin compound for longevity in marine environments.
• Installation Profile: Designed for engines equipped with a one-piece engine-mounted sea water pump.

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.

Technical Specifications

Package Contents

• 1 x Water Pump Housing (Replaces 46-807151A14)
• 1 x Water Pump Impeller
• 1 x Wear Plate
• 1 x Installation Bolts with Washers
• 1 x O-Rings

Installation Guide

1. Safety First: Disconnect the boat’s battery and close the fuel or water seacock before beginning.
2. Drain System: Drain the cooling system to prevent spills.
3. Remove Belt: Loosen the tensioner and remove the serpentine belt from the sea water pump pulley.
4. Disconnect Hoses: Carefully disconnect the intake and output hoses from the pump housing.
5. Remove Old Pump: Unbolt and remove the entire one-piece water pump assembly from the engine block.
6. Clean Surface: Thoroughly clean the engine mounting surface to ensure a proper seal.
7. Prepare New Pump: Lubricate the new impeller and insert it into the new housing. Install the wear plate and O-rings.
8. Mount New Pump: Install the new pump assembly onto the engine, tightening the bolts to the manufacturer-specified torque.
9. Reconnect: Re-attach the hoses and reinstall the serpentine belt, ensuring correct tension.
10. Final Checks: Reconnect the battery, open the seacock, and start the engine. Check immediately for any leaks and verify proper water flow/pressure.

Troubleshooting & FAQ

A: First, verify your engine model and year falls within the 1987–2016 range listed in the compatibility table. Second, confirm your engine uses a one-piece plastic sea water pump housing. Finally, you can cross-reference your existing part number with the numbers on our list, such as MerCruiser 46-807151A14 or Sierra 18-3150.

A: The most common signs are the engine overheating at idle or low speeds, a weak or non-existent stream of water from the tell-tale outlet, and a noticeably lower water pressure reading on your gauges. Upon inspection, a worn impeller may be cracked, brittle, or have missing blades.

A: As a crucial preventative maintenance item, we recommend inspecting the impeller annually. For optimal reliability, replacing the impeller every 1-2 years or 100-200 hours of operation is advisable. It's good practice to replace the housing when it shows signs of wear, warping, or scoring to ensure proper sealing and pressure.

A: This kit is designed to be a direct replacement for the original OEM one-piece plastic housing. It is made from a durable, corrosion-proof phenolic resin compound that meets or exceeds original specifications for performance and longevity in a marine environment.

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.

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.

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.