Sierra 18-3586-1 Water Pump

Sierra 18-3586-1 Water Pump

Keep your marine engine cooling system operating reliably with the Sierra 18-3586-1 Water Pump. Designed as a high-quality replacement for select inboard and sterndrive applications, this raw water pump helps maintain proper cooling water circulation to protect your engine from overheating and maintain dependable on-water performance.

The raw water pump is responsible for pulling water through the intake system and circulating it through the engine and exhaust components. Over time, pump bearings, seals, shafts, and internal components can wear from heat, debris, and continuous operation. Replacing a worn water pump helps restore proper cooling system efficiency and reduces the risk of costly engine damage caused by overheating.

Manufactured using durable marine-grade materials, the Sierra 18-3586-1 water pump is engineered to meet or exceed OEM specifications for reliable fitment, long service life, and dependable cooling performance in both freshwater and saltwater environments.

Common Engine Fitments

The Sierra 18-3586-1 water pump is commonly used on select marine engine applications, including:

• MerCruiser 5.0L MPI
• MerCruiser 5.7L MPI
• MerCruiser 350 MAG
• PCM Excalibur 5.7L
• Crusader 5.7L MPI
• Volvo Penta 5.0Gi and 5.7Gi engines

These engines are frequently found in:

• Sea Ray sport boats and cruisers
• Chaparral SSi and Signature models
• Four Winns Horizon series
• Malibu Wakesetter and Response boats
• Correct Craft Ski Nautique models
• Supra and Moomba towboats with compatible engine packages

The 18-3586-1 pump is commonly used in raw water cooling systems where maintaining strong and consistent water circulation is essential for engine reliability and cooling efficiency.

Fitment can vary depending on engine serial number, pulley setup, and cooling system configuration, so confirming compatibility with part number 18-3586-1 before ordering is recommended.

Key Features

• High-quality marine raw water pump
• Helps maintain proper engine cooling water circulation
• Designed for MerCruiser, PCM, Crusader, and Volvo Penta applications
• Marine-grade construction for durability and long service life
• Helps reduce the risk of overheating and cooling system failure
• Direct replacement for straightforward installation

Why Replace a Raw Water Pump?

A worn water pump can reduce cooling system efficiency and eventually lead to overheating issues that affect engine performance and reliability. Replacing aging pump components helps restore dependable water flow and protect critical engine components from excessive heat.

If you’re servicing a compatible inboard or sterndrive marine engine, the Sierra 18-3586-1 water pump delivers dependable cooling performance and OEM-style reliability you can trust.