Sierra Circulating Water Pump 18-3584-1, Replaces 71683A1, for Mercruiser 215 to 255 & 888, Ford Small Block V-8 Engines

The Sierra Circulating Water Pump, part number 18-3584-1, is a direct-fit replacement circulating pump built for Mercruiser 215 to 255 and 888 applications as well as Ford small block V-8 engines. This pump handles the job of circulating coolant through the engine block to keep operating temperatures in check, a critical function for marine engines that run for extended periods under load. It is constructed from stainless steel, chosen for its resistance to corrosion in the marine environment where exposure to moisture and saltwater accelerates wear on lesser materials. Because it is designed as a replacement unit, it is engineered to install in place of the original equipment pump without modification, using the same mounting points and drive configuration as the parts it replaces. Boat owners and marine mechanics use this pump when the factory circulating pump has failed, developed a leak, or is nearing the end of its service life, and replacing it proactively is a common part of a broader cooling system overhaul. The pump carries a cross-reference to several OEM and aftermarket part numbers, making it straightforward to identify as the correct replacement when working from an old part number or a parts diagram. At 12.59 pounds, it is a solid, fully assembled unit ready for installation.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3584-1
• Item Type: Circulating Water Pump
• Material: Stainless Steel
• Weight: 12.59 pounds
• UPC: 808282377939
• Fitment - Mercruiser: 215 to 255 & 888
• Fitment - Ford: Small block V-8 engines
• OEM Cross Reference: 71683A1, 883885, 71683, 58086, 56879

Fitment

• Mercruiser 215 to 255 & 888
• Ford small block V-8 engines

Replaces (OEM)

• 71683A1
• 883885
• 71683
• 58086
• 56879

Frequently Asked Questions

What engines does the Sierra 18-3584-1 circulating water pump fit? The Sierra 18-3584-1 fits Mercruiser 215 to 255 and 888 engines, as well as Ford small block V-8 engines.

What OEM part numbers does 18-3584-1 replace? It replaces OEM and aftermarket numbers 71683A1, 883885, 71683, 58086, and 56879, so any of those numbers point to this same Sierra circulating water pump.

What material is the 18-3584-1 water pump made from? It is made from stainless steel, chosen for its resistance to corrosion in marine cooling system environments.

How much does the Sierra circulating water pump weigh? The Sierra 18-3584-1 circulating water pump weighs 12.59 pounds.

Is this a direct OEM replacement or a generic part? The 18-3584-1 is engineered as a direct replacement for the original Mercruiser and Ford small block V-8 circulating pumps it cross-references, matching the mounting and drive configuration of the parts it replaces.

Will this pump work on a Mercruiser 888 engine? Yes, the Sierra 18-3584-1 is listed for Mercruiser 215 to 255 and 888 applications.

Does the 18-3584-1 fit Ford small block V-8 marine engines? Yes, this circulating water pump is designated for Ford small block V-8 engines in addition to the listed Mercruiser applications.

What function does a circulating water pump serve on a marine engine? A circulating water pump like the Sierra 18-3584-1 moves coolant through the engine block to regulate operating temperature during running.

How do I know if I need part number 18-3584-1 versus another Sierra pump? If your old pump or parts diagram references 71683A1, 883885, 71683, 58086, or 56879, the Sierra 18-3584-1 is the correct cross-referenced replacement.

Is the Sierra 18-3584-1 pump fully assembled and ready to install? Yes, the 18-3584-1 circulating water pump ships as a complete assembled unit weighing 12.59 pounds.