Component description for the coolant thermostat - GF20.10-P-3162MCC
ENGINE 132.9 in MODEL 451.3 /4
Shown on engine 132.930
Scheme 1
Location
The thermostat is located in the direction of travel on the right on the engine block.
Task
The thermostat separates the large from the small coolant circuit for a cold engine. This ensures that the engine reaches its operating temperature quicker. As the coolant temperature increases the thermostat opens and coolant also flows through the large coolant circuit.
Scheme 2
Design
The thermostat mainly consists of an expansion element, a return spring and two valve plates. A special wax is used as an expanding material.
Function
On a cold engine the thermostat is closed and the coolant flows through the small coolant circuit.
As the coolant temperature increases the expanding material melts and presses against the rubber insert. The metal pin is pushed out of the rubber insert. The fact that this rests against the upper housing means that the whole metal can with both valve plates is pressed downwards.
At full stroke the lower plate closes the small circuit. At the same time the upper plate frees up the large coolant circuit with the maximum cross-section.
During cooling of the coolant the expanding material solidifies again and the spring presses the pin back. The large coolant circuit is finally closed.
The whole process represents a continuous regulating process for which the coolant temperature can be held constant with a precision of T ± 5°C.
Fan motor, component description - GF20.20-P-1000MCU
ENGINES 132.9 in MODEL 451.3 /4
Scheme 3
Location
The coolant fan motor is located at the rear of the radiator.
Task
The coolant fan motor actuated by the SAM control unit (N10/10) generates a suctioned air flow behind the cooler. In this way the temperature of the coolant passing through the radiator is lowered.