For MerCruiser Circulation 4.3L 5.0L 5.7L Water Pump 18-684M 60658 With Gasket

Circulation Water Pump for MerCruiser 4.3L 5.0L 5.7L with Gasket 18-684M 60658

This circulation water pump for MerCruiser 4.3L, 5.0L, and 5.7L marine engines moves coolant through the block and manifolds to keep operating temperatures steady, and it cross references part numbers 18-684M and 60658 with a gasket included.

Overview

This circulation water pump for MerCruiser engines circulates coolant through the engine block, heads, and manifolds to hold operating temperature in the proper range. It is built as a direct fit replacement for 4.3L, 5.0L, and 5.7L marine applications and arrives with the gasket needed for installation. It suits boat owners and mechanics servicing a raw water or closed cooling system on a stern drive or inboard setup.

Built For Performance

• Cross references part numbers 18-684M and 60658 for easy matching
• Fits 4.3L, 5.0L, and 5.7L MerCruiser engine displacements
• Gasket included so the install can be completed in one job
• Impeller and housing designed for continuous marine coolant flow
• Sealed bearing assembly built to handle sustained engine speeds
• Corrosion resistant construction suited to wet marine environments

Fits These Machines

• for MerCruiser 4.3L marine engines
• for MerCruiser 5.0L marine engines
• for MerCruiser 5.7L marine engines
• for MerCruiser stern drive and inboard cooling systems using these displacements

On-The-Job Use

• Routine replacement when a circulation pump begins leaking or squealing
• Freshwater and saltwater boats running a MerCruiser 4.3L, 5.0L, or 5.7L
• Cooling system service during winterization or spring recommissioning
• Repower and rebuild projects pairing a new pump with other cooling components

Specs At A Glance

Good To Know

Q: How do I know this pump matches my engine? A: Compare the 18-684M and 60658 cross references against the number on your existing pump or engine spec sheet. Displacement alone may not cover every variation.

Q: Should the gasket be replaced every time? A: Yes, a fresh gasket should be used each time the pump is removed to prevent coolant leaks at the mounting face. The included gasket covers that step.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.