ATRACYPART Sea Water Pump for Mercruiser 4.3L/5.0L/5.7L – Bronze Impeller, Corrosion-Resistant

High-strength sea water pump with an original bronze impeller designed to restore reliable cooling for 4.3L, 5.0L and 5.7L Mercruiser-compatible engines.

This ATRACYPART replacement sea water pump is engineered for marine cooling systems that require durable corrosion resistance and consistent flow. It features a bronze impeller, reinforced housing, zinc-coated base, and high-quality bearings to withstand saltwater exposure and prolonged operation. The pump is compatible with a broad range of V6 and V8 small-block engines from Mercruiser, Penta, OMC, Indmar, Chrysler and Pleasurecraft systems, and it ships with an instruction manual and a 36-month warranty.

Which engines and models will this pump fit?

This pump is built for small-block marine cooling systems commonly found in recreational and performance boats. It fits 4.3L, 5.0L and 5.7L V6/V8 configurations and many related inboard and stern drive applications from 1963 through 2014, including Mercruiser, Penta and OMC families.

• Compatible with Pleasurecraft PCM small block cooling systems: V6 (140–200 hp) and V8 (155–260 hp) ranges.
• Fits Mercruiser models from 1963–2014 and Penta models from 1973 onward.
• Also compatible with select Indmar, Chrysler and OMC inboard and stern drive engines.

How does this pump resist corrosion and wear in saltwater use?

The pump combines a bronze impeller and a reinforced housing with a zinc-coated bottom to slow galvanic corrosion and resist pitting from salt exposure. High-grade C&U bearings and precision machining reduce wobble and extend service life under continuous marine conditions.

• Bronze impeller for greater resistance to erosion and cavitation than standard composites.
• Zinc-coated base and reinforced housing material for improved anti-corrosion protection.
• Quality C&U bearing assembly to limit wear and maintain smooth rotation over time.

What do I need to know before replacing my existing water pump?

Confirm engine compatibility and inspect the original pump design before installation. Note that this pump cannot replace the engine circulating pump on 2007 and newer V6 4.3L engines that require a water bypass hole—verify your engine’s plumbing configuration to avoid improper fitment.

• Match your OE numbers or the engine family (4.3L/5.0L/5.7L) to ensure fitment.
• Check for a water bypass hole on 2007+ V6 4.3L engines—this pump is not a substitute in those cases.
• Inspect impeller housing, gaskets and shaft for signs of damage when installing.

Which original equipment numbers does this pump replace and what warranty is included?

ATRACYPART supplies this unit as a direct replacement for many original pump references from Mercruiser, OMC, Penta, Pleasurecraft and others. A comprehensive 36-month warranty covers defects, and ATRACYPART customer support is available to assist with returns or technical questions.

• Replaces common OE numbers such as Mercruiser 8M0113734, 17437, 850399 and related Sierra, GLM, Crusader and Indmar references.
• Comes with a 36-month warranty and instruction manual for straightforward installation.
• Customer service support offered for fitment questions and warranty claims.

Who is this for: This sea water pump is intended for boat owners, mechanics and marina technicians who maintain small-block marine engines (4.3L, 5.0L, 5.7L) and need a rugged, long-lasting replacement with a bronze impeller. Choose this pump if you require broad compatibility across Mercruiser-related systems, improved corrosion resistance in saltwater, and the reassurance of a multi-year warranty; however, verify your engine’s bypass configuration for 2007+ V6 4.3L models before purchasing.