2PCS Thermostat Housing Sleeve for MerCruiser Marine Engines 23-806922 174951

2PCS Thermostat Housing Sleeve for MerCruiser Marine Engines

This set of two thermostat housing sleeves replaces worn sleeves in MerCruiser marine engines and matches OEM cross-reference numbers 23-806922 and 174951.

Overview

This thermostat housing sleeve is a marine-grade replacement part for MerCruiser engines that use the 23-806922 or 174951 design. It helps maintain proper coolant flow by securing the thermostat, making it a practical choice for engine repairs and routine cooling system maintenance. The two-piece set provides a spare or covers a twin-stat housing when needed.

Built For Performance

• Two-piece set covers one replacement or a second thermostat position
• Matches OEM part numbers 23-806922 and 174951 for direct crossover
• Constructed for marine cooling systems that see saltwater and freshwater use
• Precision-fit sleeve design keeps the thermostat properly aligned
• Resists heat and corrosion for dependable service in the engine housing

On-The-Job Use

• Replacing cracked or corroded thermostat housing sleeves in MerCruiser marine engines
• Servicing raw-water and closed-cooling systems on inboard and sterndrive boats
• Routine cooling system maintenance when the thermostat is being replaced
• Refreshing an older MerCruiser engine's cooling circuit during a rebuild

Specs At A Glance

Good To Know

Q: What does this thermostat housing sleeve do? A: It holds the thermostat in place inside the housing so the engine cooling system can open and close the coolant flow correctly. This helps keep the MerCruiser engine from overheating or running too cool.

Q: How do I know this sleeve fits a specific MerCruiser? A: Compare the existing part numbers 23-806922 or 174951 on the sleeve and confirm the engine serial number. Because production changes can occur, matching the OEM reference before ordering is the safest way to verify fitment.

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