SIERRA 18-3593 Water Pump Replaces: 884727

Replacement pump for GM based 4 and 6 cylinder inline engines.

The water pump is the heart of your MerCruiser sterndrive cooling system; if it is not functioning at full capacity, there is a risk of overheating the engine. Each Sierra pump is engineered to meet or exceed factory specifications and is matched to the GM block used for many MerCruiser engines. These bi-directional marine water pumps feature a cast iron body and stainless steel shaft to stand up to the marine environment. Sierra water pumps are made from new castings and are not remanufactured. Give your cooling system a fresh start with a Sierra replacement water pump.

Key Features

• Engineered to be an exact match to OEM pumps
• Pumps are assembled using new castings
• Bi-directions for use on conventional and counter rotating engines
• Compatible with any MerCruiser inline 4 and 6 cylinder applications
• Backed by SeaStar Solutions Limited Two-Year Warranty

18-3593 Application Guide

The Sierra Engine Parts Selector

In addition to water pumps, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.