Thermostat Cap for 60° V4 & V6 Outboard 40-200HP 338632 The thermostat cap is a critical component in the cooling system of outboard motors, attached to the thermostat housing to regulate pressure and maintain proper engine operating temperature.The model 338632 is designed specifically for 60° V4 and V6 outboard engines with horsepower ranging from 40 to 200.It serves as a direct-fit replacement, compatibility and function within the cooling system.This cap helps prevent overheating by maintaining consistent pressure, allowing coolant to circulate effectively.A malfunctioning cap can lead to coolant leaks, reduced cooling efficiency, and potential engine damage.The 338632 model is also referenced under part numbers 0338632 and 0435491, commonly found in service manuals and parts catalogs.It is compatible with 60° V4 and V6 outboard engines between 40 and 200 horsepower.When replacing the cap, the cooling system is drained before removal.Clean the housing area after removing the old cap, then install the one securely before refilling with coolant.Common signs of a failing thermostat cap include coolant leaks around the housing, frequent need to off coolant, engine overheating during , and visible steam or excessive pressure from the cooling system.Replacing the cap when these symptoms appear helps avoid further issues.Constructed for in marine environments, this cap provides consistent pressure regulation and coolant retention.Its design allows for straightforward installation without modifications, making it a practical choice for maintenance and repair on compatible outboard models.