Sierra Circulating Water Pump 18-3577-2 for GM 4 Cyl. And In-Line 6 Cyl. Engines, 3.0L 4 Cyl.

The Sierra 18-3577-2 is a bronze circulating water pump built for marine engine cooling systems, designed to fit 3.0L 4 cylinder engines as well as GM 4 cylinder and in-line 6 cylinder engines. As a circulating water pump, it moves coolant through the engine block to maintain proper operating temperature, a critical function for reliable performance on the water. The pump is bronze construction, chosen for its corrosion resistance in marine environments where constant exposure to moisture and coolant demands durable materials.

This pump is bi-directional, meaning it is engineered to operate correctly regardless of rotation direction, simplifying installation across different engine configurations. A matching 18-0327 gasket is included with the pump, so the seal needed for a proper installation is provided in the box rather than requiring a separate purchase. Buyers replacing a worn or leaking circulating water pump on a compatible 3.0L 4 cylinder or GM 4/6 cylinder marine engine can use the 18-3577-2 as a direct fit for these applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3577-2
• Product Type: Circulating Water Pump
• Material: Bronze
• Rotation: Bi-Directional
• Gasket Included: 18-0327
• Fitment: 3.0L 4 cyl. Engines, GM 4 cyl. And in-line 6 cyl. Engines
• Weight: 14.59 pounds
• UPC: 808282374815
• Vehicle Service Type: Boat

Fitment

• 3.0L 4 cylinder engines
• GM 4 cylinder and in-line 6 cylinder engines

Frequently Asked Questions

What engines does the Sierra 18-3577-2 water pump fit? The 18-3577-2 fits 3.0L 4 cylinder engines as well as GM 4 cylinder and in-line 6 cylinder engines.

Is a gasket included with this water pump? Yes, the 18-3577-2 comes with a matching 18-0327 gasket included, so no separate gasket purchase is needed for installation.

What material is the 18-3577-2 water pump made from? It is made from bronze, a material chosen for its corrosion resistance in marine cooling system applications.

Does the pump rotation direction matter for installation? No, the 18-3577-2 is bi-directional, so it is designed to function correctly regardless of rotation direction.

How much does the Sierra 18-3577-2 water pump weigh? The 18-3577-2 weighs 14.59 pounds.

Will this pump work on a GM in-line 6 cylinder marine engine? Yes, the 18-3577-2 is listed to fit GM 4 cylinder and in-line 6 cylinder engines.

Is the 18-3577-2 a genuine Sierra part? Yes, 18-3577-2 is the manufacturer part number for this Sierra circulating water pump.

What is included in the box with this water pump? The package includes the Sierra 18-3577-2 circulating water pump and the matching 18-0327 gasket.

What type of pump is the 18-3577-2? The 18-3577-2 is a circulating water pump used in a marine engine's cooling system to move coolant through the engine block.

Does the 18-3577-2 fit 3.0L engines only? No, in addition to 3.0L 4 cylinder engines, the 18-3577-2 also fits GM 4 cylinder and in-line 6 cylinder engines.