From above, the air cleaner housing is closed with a lid, which is fastened with four M4 nuts, screwed onto the bolts fixed inside the housing, and with six spring clips pressing the edges of the cover to the housing.
The filter element is made of microporous paper folded like an accordion in order to develop a usable area. At the factory, the air cleaner is equipped with a filter element manufactured by Sandrik (element type 95 015 0173 01). From above and below, the element is covered with plastic shields of the appropriate shape, ensuring the tightness of its fit in the air cleaner housing. The degree of air purification with such a filter reaches 99.9%.
Service
Maintenance of the air cleaner consists of periodic cleaning (every 10,000 km of run) and replacement (every 20,000 km) filter element. When operating the vehicle in dusty or polluted conditions, service intervals should be halved.
For every liter of fuel burned, the engine needs about 10÷12 liters of air. The air flow required to produce an engine power of about 1 kW is 80 l / min. Thus, the condition of the air sucked into the engine is of particular importance.
The level of air pollution depends on the distance from industrial facilities, the condition of the road surface, weather conditions and traffic intensity. Even when driving on a motorway at high speed and at a considerable distance from populated areas, the air filter becomes intensively contaminated due to, for example, rubber particles that accumulate on the road as a result of tire tread wear.
The conducted operational studies show that when operating vehicles on unpaved roads, as well as in large settlements where the degree of air pollution is very high, the air cleaner filter element should be cleaned every 2000 km of run, and its replacement - every 7÷8 thousand km.
Air filter contamination leads to a decrease in the power developed by the engine, an increase in fuel consumption (up to 15%), a significant increase in the content of toxic components in the exhaust gases, as well as the dilution of engine oil by unburned fuel.
Violation of the tightness of the air cleaner seat, reducing the efficiency of its functioning (usually as a result of the use of low-quality work items), can cause premature engine wear. Under no circumstances should the vehicle be operated without an air filter.
The filter element is cleaned as follows:
- a) Loosen the four M6 nuts securing the air cleaner cover with a 10 mm wrench;
- b) Release the six spring clips located around the perimeter, remove the cover and remove the filter element from the housing;
- c) Blow out the removed working element with compressed air from the center outwards (you can also use a conventional vacuum cleaner, sucking air around the outer perimeter of the element);
- d) Thoroughly wipe the inside surface of the air cleaner housing to remove accumulated dust and dirt deposits - take precautions against dirt entering the carburetor air inlet (clog it with a rag);
- e) When installing the air cleaner cover, make sure that the mark on it is located opposite the air cleaner inlet pipe.
When replacing the filter element, proceed in the same way as when removing it for cleaning (see previous paragraph).
Removing the air cleaner assembly is carried out in the following order:
- a) Remove the air cleaner cover and remove the filter element;
- b) Give an M6 nut of fastening of assembly of the case to an arm on a head of cylinders;
- c) Give three M5 nuts securing the air cleaner housing to the carburetor (try not to let them fall into the air inlet of the latter).
Note. One of the nuts (the one that is located in front of the others [by car]) planted close to the carburetor jet hole;
- d) Remove the metal trim;
- e) Loosen the clamp bolt of the rubber sleeve at the end of the intake duct of the air cleaner housing;
- f) Lift the air cleaner housing up and remove it from the carburetor mounting flange;
- g) Disconnect the end of the heated air supply hose. Remove the sleeve along with the small elbow in which it is attached to the ledge on the air cleaner inlet pipe; When installing the air cleaner in place, make sure that the protrusion on the metal plate enters the reciprocal recess of the gasket installed between the body and the carburetor.
Access to the thermostat located inside the air cleaner opens after removing the cover of the latter. From time to time, you should check the correct operation of the thermostat (those. actuation of its valve when it is below 20÷25°С and above 25÷35°С.
The easiest way to check the operation of the air cleaner thermostat is with an ordinary hair dryer. Direct a jet of warm air at the thermostat and make sure that this causes the diaphragm to move.
Note. Be careful! Excessive overheating of the thermostat can lead to its failure!
The diaphragm of a damaged thermostat will remain fixed. If such a malfunction occurs, there is a significant increase in fuel consumption.
For a more detailed check of the state of the thermostat, prepare a deep container with water at a temperature of 30÷35°C. Then proceed as follows:
- a) Immerse the air cleaner body in water in a vertical position with the inlet pipe facing up. At maximum depth, the water level should reach the edge of the warm air inlet (the cut should be no more than 1÷2 cm above the water level);
- b) After a minute, make sure that the diaphragm has taken a position corresponding to blocking the supply of heated air;
- c) Make sure that as the water cools, the thermostat gradually opens the warm air duct and shuts off the cold air supply. For simplicity, the thermostat should be hung with a wire or piece of string. The minimum operating temperature of the diaphragm is 20°C (keep a thermometer handy). With a rapid decrease in water temperature, the transition of the diaphragm from one position to another should take no more than a minute. Otherwise, there is excessive contamination of the assembly, which should be tried to be eliminated.