Thermostat Housing Cover & Gaskets for MerCruiser Closed Cooling 55131A5 18-3532

Thermostat Housing Cover & Gaskets for MerCruiser

This thermostat housing cover and gasket set provides a direct replacement for MerCruiser closed cooling systems, referencing OEM numbers 55131A5 and 18-3532.

Overview

This thermostat housing cover and gasket set is specifically designed for MerCruiser marine engines with closed cooling systems. It replaces the original housing cover and seals to maintain proper coolant flow and engine temperature regulation. Ideal for boat owners and marine mechanics performing cooling system repairs.

Built For Performance

• Precision-cast aluminum housing for corrosion resistance
• Includes high-quality gaskets for a leak-free seal
• Direct fit to MerCruiser closed cooling thermostat housings
• Engineered to withstand marine engine vibration and temperature extremes

On-The-Job Use

• Closed cooling system maintenance on MerCruiser inboard and sterndrive engines
• Replacement of cracked or corroded thermostat housings
• Engine overheating troubleshooting and repair
• Winterization preparation and cooling system overhaul

Specs At A Glance

Good To Know

Q: Does this cover work with both fresh water and raw water cooling? A: This cover is specifically for closed cooling systems, which use coolant rather than raw water; it is not compatible with raw water cooling setups.

Q: Are the gaskets reusable? A: No, the gaskets should be replaced each time the housing is removed to ensure a proper seal and prevent coolant leaks.

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