Sierra Circulating Water Pump 18-3586-1 for GM V-6 & Small Block V-8 Marine Engines, Replaces RA057018

The Sierra 18-3586-1 is a circulating water pump built for GM V-6 and small block V-8 marine engines. It is the pump that drives raw water or coolant through the engine's cooling passages, keeping operating temperatures in the safe range during run time. The pump is designed as a direct replacement for the OEM RA057018 unit, so it bolts into the same location and mates with the same drive arrangement without modification.

A mounting gasket, Sierra part 18-0981, is included with the pump so the installation is complete without having to source a separate gasket. This keeps the replacement job straightforward: remove the worn or leaking factory pump, transfer any brackets or fittings as needed, install the new pump with the included gasket, and reconnect the cooling hoses. The pump is intended for GM V-6 and small block V-8 marine engine applications, matching the fitment of the original RA057018 pump it replaces.

This water pump is categorized among circulating water pumps and impellers for inboard cooling systems, reflecting its role as a serviceable cooling-system component rather than a sealed, non-repairable assembly. Owners replacing a worn, seized, or leaking water pump on a GM-based marine V-6 or small block V-8 can use this part number to source a like-for-like replacement.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3586-1
• Category: PleasureCraft Water Pumps & Impellers
• Engine Application: GM V-6 & small block V-8 engines
• Gasket Included: 18-0981
• OEM Cross Reference: RA057018
• Weight: 3.91 pounds
• UPC: 808282369644

Fitment

• GM V-6 & small block V-8 marine engines

Replaces (OEM)

• RA057018

Frequently Asked Questions

What does the Sierra 18-3586-1 water pump replace? The Sierra 18-3586-1 is a direct replacement for OEM part RA057018, so it fits in place of the original pump without modification.

Is a gasket included with this water pump? Yes, the 18-3586-1 water pump ships with Sierra gasket 18-0981 included, so no separate gasket purchase is needed for installation.

What engines does the 18-3586-1 water pump fit? This pump is designed for GM V-6 and small block V-8 marine engines.

How much does the 18-3586-1 water pump weigh? The Sierra 18-3586-1 circulating water pump weighs 3.91 pounds.

Is the 18-3586-1 a genuine Sierra part? Yes, 18-3586-1 is the Sierra manufacturer part number for this circulating water pump, not an aftermarket clone.

Will this pump work as a like-for-like swap for a worn OEM RA057018 pump? Because 18-3586-1 replaces RA057018 directly, it is intended as a like-for-like swap on GM V-6 and small block V-8 marine engines.

What type of pump is the 18-3586-1? It is a circulating water pump used in the raw water or coolant cooling system of GM V-6 and small block V-8 marine engines.

Does the 18-3586-1 come with mounting hardware besides the gasket? The included component confirmed for this pump is gasket 18-0981; no other hardware is specified for the 18-3586-1.

What is included in the box with the 18-3586-1 water pump? The box includes the Sierra 18-3586-1 circulating water pump along with gasket 18-0981.

Can the 18-3586-1 be used on any GM marine V-8? The 18-3586-1 is specified for GM V-6 and small block V-8 marine engines; confirm your engine matches this small block V-8 or V-6 configuration before ordering.