Sea Water Pump Kit – Fits MerCruiser Bravo & TRS Sterndrives and Inboard Engines (Replaces 46-807151A14)

Sea Water Pump Kit – Fits MerCruiser Bravo & TRS Sterndrives and Inboard Engines (Replaces 46-807151A14)

This is an aftermarket sea water pump kit compatible with a wide range of Mercury MerCruiser Bravo, TRS Sterndrives, and Inboard Marine engines that use a one-piece housing design. This comprehensive kit includes the complete water pump assembly with housing, impeller, and all necessary mounting hardware for a straightforward installation.

It serves as a direct replacement for Mercury part numbers 46-807151A14 and 46-807151A7, as well as Quicksilver 807151A14/807151A7, Sierra 18-3150, GLM 12088, Mallory Marine 9-48350, Pro Marine 64151, and Redline RL3150.

• Includes the complete pump assembly, featuring a durable phenolic resin housing and a high-performance impeller.
• Engineered as a direct replacement for engines with a one-piece housing.
• This assembly can also be used to upgrade and replace older two-piece housing sea water pump designs.

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

Installation Guide

1. Safety First: Disconnect the engine's battery and close the water inlet valve (sea cock).
2. Drain System: Place a catch pan under the pump and drain any remaining water from the hoses.
3. Remove Hoses: Loosen the hose clamps and carefully detach the inlet and outlet hoses from the pump housing.
4. Unbolt the Pump: Remove the mounting bolts that secure the old pump assembly to the engine bracket.
5. Clean Surface: Thoroughly clean the mounting bracket surface, removing any old gasket material or sealant residue.
6. Prepare New Pump: Place the new O-ring or gasket onto the new pump housing.
7. Mount New Pump: Position the new water pump assembly onto the bracket and align the bolt holes.
8. Secure Bolts: Install and hand-tighten the new bolts, then torque them to the manufacturer's specifications in a crisscross pattern.
9. Reconnect Hoses: Attach the water hoses to the new pump and securely tighten the clamps.
10. Check Connections: Double-check that all bolts and hose clamps are tight.
11. Restore Water and Power: Open the sea cock and reconnect the battery.
12. Test for Leaks: Start the engine and immediately check the pump and hose connections for any water leaks. Monitor for proper water flow from the exhaust.

Troubleshooting & FAQ

How do I know if this pump fits my MerCruiser engine?

This kit fits a wide range of MerCruiser Bravo, TRS, and Inboard engines that use a one-piece housing. Please consult the "Compatible Engine Models" table and cross-reference your engine model. It can also be used to upgrade older two-piece housing pumps.

What are the signs that my sea water pump is failing?

Common signs include the engine overheating at idle or low speeds, a weak or inconsistent stream of water from the exhaust, visible cracks on the pump housing, or a damaged/worn impeller upon inspection.

How often should the impeller be replaced?

Impeller lifespan varies based on usage and water conditions (sandy, silty water causes faster wear). We recommend inspecting the impeller annually and replacing it every 1-2 years as part of preventative maintenance, or immediately if you notice cracks, stiffness, or missing blades.

What's the difference between this and the original Mercury pump?

This is an aftermarket kit designed to meet or exceed OEM specifications for fit, form, and function. The housing is made from a durable, corrosion-resistant phenolic resin compound, and the kit includes all necessary gaskets and hardware for a direct replacement of OEM part 46-807151A14.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.