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

Water Pump Impeller Kit with Housing – Fits MerCruiser Alpha & Bravo Engines

This comprehensive water pump impeller repair kit fits a wide range of MerCruiser Alpha and Bravo inboard engines equipped with a plastic one-piece body sea water pump. It is designed for V6 and V8 models, including 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L engines.

This kit serves as a direct replacement for Mercury/MerCruiser 46-807151A14, Sierra 18-3150, and Mallory 9-48350, among others, ensuring a precise fit and reliable cooling performance.

• Complete Repair Kit: Includes the impeller, housing, wear plate, O-rings, quad ring, and all necessary bolts and washers for a full service.
• Specific Application: Engineered specifically for engine-mounted sea water pumps with a plastic one-piece body.
• Broad Compatibility: Covers numerous MerCruiser Alpha, Bravo, and performance series engines.

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

This kit includes all components required for a complete water pump overhaul.

• 1 x Water Pump Housing/Assembly (Replaces 46-807151A1)
• 1 x Impeller (Replaces 47-59362T1)
• 1 x O-Ring (Replaces 25-33465 / 25-8M0214925)
• 1 x Quad Ring (Replaces 25-94288 / 25-8M0215007)
• 1 x Wear Plate, Outer (Replaces 94576 / 8M0204674)
• 5 x Screws, Hex Head .312-18 x 3.250 (Replaces 10-74191 / 8M0204669)
• 2 x Screws, Hex Head .312-18 x 2.68 (Replaces 10-807356)
• 5 x Washers, .344 x .688 x .065 Stainless Steel (Replaces 12-814806)

Installation Guide

Follow these steps for a successful installation. Professional installation is recommended.

1. Disconnect the negative battery cable to ensure safety.
2. Close the seacock (if equipped) and drain the existing seawater cooling system.
3. Loosen the hose clamps and remove the hoses from the water pump housing.
4. Unscrew the mounting bolts and carefully remove the old pump assembly from the engine.
5. Clean the mounting surface on the engine, ensuring it is free of old gasket material or debris.
6. Assemble the new kit: place the new wear plate and impeller inside the new housing. Use a suitable lubricant on the impeller.
7. Install the new O-rings/seals onto the pump housing.
8. Mount the new water pump assembly onto the engine.
9. Thread the new bolts and washers by hand, then tighten them evenly in a star pattern to the specified torque of 17 ft-lbs. Do not overtighten.
10. Reconnect the water hoses and secure the clamps.
11. Open the seacock, reconnect the battery cable, start the engine, and immediately check for proper water flow and leaks.

Troubleshooting & FAQ

Q: How do I know if this kit fits my MerCruiser engine?
A: This kit is for MerCruiser Alpha and Bravo engines with a plastic one-piece body sea water pump. It is not for engines with a solid plate front mount. Please verify your engine model against the compatibility list and ensure your current pump is a one-piece plastic design.

Q: What are the signs of a failing water pump impeller?
A: Common signs include the engine overheating at idle or low speeds, a weak water stream from the tell-tale outlet, and visible cracks, stiffness, or damage on the old impeller's vanes upon inspection.

Q: How often should the impeller be replaced?
A: It's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. Replacement frequency should be increased in saltwater or silty 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.