Water pump
The normal location of the special pump for pumping the coolant – front cylinder head. Structurally, the pump represents a housing which houses an impeller mounted on a shaft. The latter is in a pair of bearings (one on each end). The rotation of the shaft is effected by transmission of torque through the belt from the engine. Malfunction of pump lead to overheating of the motor and subsequent failure.
There are several signs of water pump failure:
- readings indicating the temperature of the coolant located in the red sector;
- in the cabin there is a smell of coolant;
- there are noises (most often the whistle, indicating the need for repair, replacement of pumps);
- under the car visible drops of coolant (the presence of leaks can be determined by means of a sheet of paper, spread out under the engine and left for the night).
In some cases, possible partial repair of the water pump. For example, replacement of shaft bearings. However, in order to restore this unit, the necessary experience and the appropriate tools, fixtures. Therefore, it is better to buy a new pump.
Fuel pump
The task of this pump is to supply fuel to the engine. Earlier carbureted cars used mechanical pumps. They had driven directly by the engine, a special rod was pushing the diaphragm, creating a vacuum and pumping fuel into the carb. Today, the vast majority of cars have fuel injection system and electric fuel pump.
Its functions are:
- deliver fuel at a rate of 1-2 l/min.;
- ensuring constant pressure in the fuel system (approximately 700 MPa).
Modern fuel pump are electric motor, which is rigidly connected to a rotor, a propulsive fuel. Petrol pump is installed directly in the tank of the car. This fuel plays a role of a coolant and lubricant composition. Some models of cars have 2 pumps: one is the main and is installed under the hood, the second, the worker is placed in the fuel tank.