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

Sea Water Pump Body/Impeller Kit – Fits MerCruiser Alpha & Bravo Engines

This complete sea water pump body and impeller kit is designed for a wide range of MerCruiser engines. It serves as a direct, high-quality replacement for engine-mounted sea water pumps, ensuring reliable cooling performance.

This assembly fits MerCruiser Alpha engines with FWC (closed cooling) and an internal pump, all Bravo models, Ski engines, Inboard engines, 330 (B-W) TR/TRS models, and certain Hi-Performance engines without a solid plate front mount. It replaces original pumps that have a one-piece plastic housing.

• Installation Type: Engine-mounted for specified MerCruiser models.
• Complete Assembly: Includes the main pump body, impeller, wear plate, O-rings, and all necessary screws and washers for installation.
• Direct Replacement: Engineered to replace MerCruiser part numbers 46-807151A14 and 46-807151A7.

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 full pump replacement:

• 1 x WATER PUMP ASSEMBLY (Replaces 46-807151A1)
• 1 x IMPELLER (Replaces 47-59362T1)
• 1 x WEAR PLATE OUTER (Replaces 94576/8M0204674)
• 1 x O-RING (Replaces 25-33465/25-8M0214925)
• 1 x QUAD RING (Replaces 25-94288/25-8M0215007)
• 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

Professional installation is recommended. The following are general steps and may not apply to all engine models.

1. Safety First: Disconnect the battery and ensure the engine is cool. Close the water inlet seacock.
2. Access the Pump: Locate the sea water pump on the engine block.
3. Disconnect Hoses: Loosen the hose clamps and carefully remove the inlet and outlet water hoses from the pump. Note their orientation.
4. Remove Old Pump: Unscrew the mounting bolts that secure the pump assembly to the engine. Remove the old pump and any gasket or O-ring material.
5. Clean Surface: Thoroughly clean the engine mounting surface to ensure a proper seal.
6. Install New Pump: Place the new O-ring or gasket on the new pump assembly and position it on the engine.
7. Secure Pump: Insert and hand-tighten the new mounting bolts, then torque them to the manufacturer's specified value in a crossing pattern.
8. Reconnect Hoses: Re-attach the water hoses to the new pump and tighten the clamps securely.
9. Final Checks: Open the seacock. Reconnect the battery.
10. Test for Leaks: Start the engine and immediately check the pump and hose connections for any water leaks. Let the engine run for several minutes to confirm proper operation.

Troubleshooting & FAQ

Q: How do I confirm this fits my MerCruiser engine?

A: This kit is designed for MerCruiser Alpha engines (with FWC closed cooling), all Bravo and Ski models, Inboard engines, and 330 TR/TRS models. It is a direct replacement for housings with part number 46-807151A14. The best way to ensure fitment is to compare your existing part to the photos and part numbers provided in our cross-reference table. If your engine is listed but your part looks different, do not order.

Q: What is the main difference between this pump and the original OEM version?

A: Our aftermarket pump assembly is engineered to meet or exceed original OEM specifications. Notably, this kit features a durable, one-piece plastic housing design that serves as an upgrade for older two-piece housing pumps, reducing the potential for leaks.

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

A: For optimal engine protection, impellers should be inspected annually and replaced every 1-2 years or every 100-200 hours of operation. Common signs of a failing impeller include the engine overheating at idle speeds, a weak or no stream of water from the exhaust, and visible cracks or stiffness in the impeller vanes.

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.