AA Ignition Marine Raw Water Pump Impeller Kit for MerCruiser 350–502 Engines — Includes Gaskets & 2-Year Warranty

AA Ignition's Marine Raw Water Pump Impeller Kit is a plug-and-play replacement that renews cooling flow for compatible MerCruiser engines, restoring reliable raw-water circulation and preventing overheating due to a worn impeller.

Boats need consistent seawater flow to keep engine temperatures in check; a degraded impeller is a common source of cooling loss. This kit includes a flexible marine-grade impeller plus the necessary gaskets and seals to rebuild the raw water pump quickly without modifications. It cross-references MerCruiser part numbers 807151A14, 18-3150AA and others, offering an economical alternative engineered to meet OEM fit and performance standards and backed by a two-year warranty.

How do I know this impeller kit fits my MerCruiser engine?

Compatibility is determined by matching the original part number or confirming your engine model. This kit replaces OEM numbers like 807151A14 and fits a range of MerCruiser blocks including 350 Magnum MPI Alpha/Bravo, 357, 383, 454, 502 and select SCi and GEN+ variants.

• Match any of the listed OEM cross-reference numbers on your old part.
• Confirm engine model: 350 Magnum MPI Alpha/Bravo, 357 Alpha/Bravo 4V, 383, 454 MPI, 502 MPI and more.
• Check the full compatibility chart before ordering to guarantee correct fit.

What comes in the kit and what tools will I need?

The kit contains the impeller, gaskets and seals required to reseal the pump housing. Because it’s designed as a direct-fit replacement, installation is straightforward for anyone comfortable with basic marine maintenance.

• Included: marine-grade rubber impeller, matching gaskets and seals for a complete rebuild.
• Recommended tools: screwdriver set, pliers, gasket scraper, marine grease, torque wrench as needed.
• Estimated time: 30–60 minutes for most installations depending on access and experience.

How will this kit improve my boat's cooling performance?

Replacing a worn or shredded impeller restores proper pumping action and seawater flow, reducing the risk of overheating and associated engine damage. The flexible impeller profile is engineered to maintain a reliable seal and consistent flow through the cooling circuit under normal operating conditions.

• Restores raw-water flow to the heat exchanger and engine jacket.
• Improves pressure and removes cavitation caused by damaged vanes.
• Helps prevent overheating and reduces corrosion risk from inadequate coolant circulation.

Who this is for: This impeller kit is intended for boat owners, DIY mechanics and marine technicians who operate MerCruiser-powered vessels and need a dependable, cost-effective replacement for worn raw water pump components. It's especially useful for seasonal maintenance, pre-launch checks, or keeping a spare on board to avoid downtime. If you require an exact OEM badge, consult your dealer; if you want an engineered direct-fit rebuild kit with warranty protection and broad MerCruiser compatibility, this product is a practical choice.