Sierra Circulating Water Pump 18-3599-2, Replaces 382218, for GM V-6 & Small Block V-8 Engines

The Sierra Circulating Water Pump 18-3599-2 is a direct-fit replacement water pump built for GM V-6 and small block V-8 marine engines. It circulates raw or engine coolant through the block to keep operating temperatures in check, replacing worn or failing OEM pumps that no longer move sufficient coolant volume. Like all Sierra water pumps, the 18-3599-2 is bi-directional, so it operates correctly regardless of engine rotation, simplifying stocking and installation across compatible GM engine applications.

This pump ships with gasket 18-0981 included, so the mounting gasket does not need to be sourced separately at install time. It is designed to replace multiple OEM part numbers used across GM V-6 and small block V-8 engine production, making it a straightforward cross-reference for anyone repairing or rebuilding a marine engine cooling system. The pump carries UPC 808282374822 for easy identification when ordering or verifying the correct part.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3599-2
• Product Type: Circulating Water Pump
• Fitment: GM V-6 & small block V-8 engines
• Rotation: Bi-directional
• Included Gasket: 18-0981 (included)
• Weight: 10.34 pounds
• UPC: 808282374822

Fitment

• GM V-6 & small block V-8 engines

Replaces (OEM)

• 382218
• 980477
• 985429
• 3853850

Frequently Asked Questions

What engines does the Sierra 18-3599-2 water pump fit? The Sierra 18-3599-2 circulating water pump is built for GM V-6 and small block V-8 engines.

Is the 18-3599-2 water pump direction-specific? No, the 18-3599-2 is bi-directional, meaning it functions correctly regardless of which way the engine rotates.

Does the 18-3599-2 come with a gasket? Yes, gasket 18-0981 is included with the Sierra 18-3599-2 circulating water pump, so no separate gasket purchase is needed for installation.

What OEM part numbers does the Sierra 18-3599-2 replace? This pump replaces OEM numbers 382218, 980477, 985429, and 3853850.

How much does the Sierra 18-3599-2 water pump weigh? The Sierra 18-3599-2 circulating water pump weighs 10.34 pounds.

What is the UPC for the Sierra 18-3599-2 water pump? The UPC for the Sierra 18-3599-2 is 808282374822.

Can I use the 18-3599-2 as a direct swap for my original GM water pump? Yes, the 18-3599-2 is designed as a direct-fit replacement for GM V-6 and small block V-8 marine engines, cross-referencing to OEM numbers 382218, 980477, 985429, and 3853850.

What type of engine cooling system is the 18-3599-2 designed for? The 18-3599-2 is a circulating water pump used to move raw or engine coolant through the block of GM V-6 and small block V-8 marine engines.

Is the 18-3599-2 an aftermarket or OEM part? The 18-3599-2 is a Sierra-manufactured circulating water pump that serves as a replacement for the listed OEM part numbers rather than an original GM component.

What is included when I order the Sierra 18-3599-2? The Sierra 18-3599-2 circulating water pump ships with gasket 18-0981 included.