Maintain optimal engine temperature and performance with the 840.TH233312MA Heavy-Duty Thermostat (185°F), designed for Detroit Diesel Series 60 engines.

This thermostat regulates coolant flow to ensure your engine reaches and maintains the correct operating temperature. By opening at 185°F, it helps improve fuel efficiency, reduce engine wear, and prevent overheating or overcooling—both of which can impact engine performance and longevity.

Built for durability in demanding applications, this thermostat is ideal for fleet maintenance and engine rebuilds on heavy-duty trucks equipped with 11.1L and 12.7L engines.

Why replace your thermostat?

• Engine overheating or running too cold
• Poor fuel efficiency
• Fluctuating temperature readings
• Prevent premature engine wear

Key Benefits

• Maintains optimal engine operating temperature (185°F)
• Improves fuel efficiency and engine performance
• Heavy-duty construction for long service life
• Helps prevent overheating and engine damage
• Direct-fit replacement for Detroit Diesel applications

Applications

Compatible with:

• Detroit Diesel Series 60 11.1L
• Detroit Diesel Series 60 12.7L

Used in:

• Freightliner trucks
• Kenworth trucks
• Peterbilt trucks
• Volvo trucks