Pic. 4.23. Elements of the cooling system: 1 - heat exchanger; 2 - coolant outlet block with integrated thermostatic valve; 3 - cooling radiator; 4 - oil / coolant heat exchanger; 5 - water pump; 6 - expansion tank; 7 - water inlet manifold with drain bolt (for countries with a cold climate, a drain cock is installed instead of a drain plug); 7a - installation with drain plug; 7b - installation with heated faucet
The cooling system includes a water pump driven by an auxiliary belt from the crankshaft, a radiator fan, a radiator, an expansion tank, a thermostat, a heater radiator and hoses (pic. 4.23). When starting a cold engine, the coolant does not enter the radiator, since the thermostat valve is closed, but circulates through the block jacket and cylinder head, then enters the pump again. This ensures a quick warm-up of a cold engine. When the coolant reaches a certain temperature, the thermostat valve opens and the hot coolant flows through the hose to the radiator and is cooled by oncoming airflow.
Attention! Do not allow coolant to come into contact with clothing or body paintwork. Otherwise, rinse the surface with plenty of water. Collect the drained coolant and dispose of it.
The water pump of the cooling system is connected to the coolant outlet unit with a rigid tube, the tightness of which is ensured on the pump side by a cuff, and on the side of the coolant unit by means of a snap-on fitting on the upper hose and with a sealed tip on the lower hose.
The coolant outlet block is fixed to the cylinder head on the flywheel side with 4 bolts.
The coolant does not require replacement throughout the entire service life.