Where is the thermostat located in the Mercedes-Benz 272 engine?
1 Answers
The thermostat in the Mercedes-Benz 272 engine is installed at the water outlet on the upper part of the engine cooling system. The thermostat automatically adjusts the amount of water entering the radiator based on the coolant temperature, altering the water circulation range to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within an appropriate temperature range. The thermostat must maintain good technical condition; otherwise, it can severely affect the engine's normal operation. If the thermostat's main valve opens too late, it can cause the engine to overheat; if it opens too early, it prolongs the engine's warm-up time, resulting in the engine temperature being too low. In summary, the thermostat's role is to prevent the engine from becoming too cold. For example, after the engine has been running normally, during winter driving, without a thermostat, the engine temperature might drop too low. In such cases, the engine needs to temporarily halt water circulation to ensure the temperature doesn't become excessively low. The most commonly used thermostat is the wax-type thermostat. When the coolant temperature is below the specified value, the refined paraffin in the thermostat's temperature-sensitive body remains solid, and the thermostat valve, under the spring's force, closes the passage between the engine and the radiator. The coolant returns to the engine via the water pump, creating a small internal circulation. When the coolant temperature reaches the specified value, the paraffin begins to melt and gradually turns into a liquid, expanding in volume and compressing the rubber tube, causing it to contract. As the rubber tube contracts, it exerts an upward thrust on the push rod, which in turn applies a downward counter-thrust to the valve, opening it. At this point, the coolant flows through the radiator and the thermostat valve, then returns to the engine via the water pump, creating a large circulation.
