Technology of maintenance and repair work of the fuel supply system of the car engin

Figure 2 Electromagnetic forsunka
1-stopper; 2-valve; 4-Spring; 5-electromagnetic; 6-Filter; 7-electrical contact.
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Results and Discusion
The fuel is sent to the farsunka body through the filter (6) in a hose tool. Inside the Forsunka Hull, a valve (1) with a deflector (2) and a fast-acting electromagnet (5) were placed at one end, and the tip of the electromagnetic embers was pushed out of the hull through the contacts (7) Made of insulation (protection) [5,6]. When the electromagnet is discharged, the valve, spring (4), is pressed instead of under the influence. When a controlling electrical impulse is sent to the Forsunka contacts, the valve opens by about 0.1 mm. The difference in cyclic (periodic) transmission of fuel in one set of forceps, halos may be up to 1.5% in the case of multiple transmissions of 4% in the case of low transmission.
This provides a significant improvement in the composition of the mixture according to the cylinders, the uniformity compared to the carburetor, or central spraying.



Figure 3. Electric gasoline pump.
1-gasoline Inlet; 2-storage Valve; 3-pump; 4-yakor; 5-reverse valve;
6-release of gasoline;
The gasoline pump (Figure 3) has an electric drive, which can be connected before the stater turns the elbow shaft (turning the key in the ignition lock) during engine mileage. This results in the creation of the required pressure to spray the fuel in the driving trunk without the engine still starting. Sometimes, in order to cool the electromotor well, the electric pump is worked hermetically and lowered into the fuel in the tank.


Conclusion.
As a result, the reduction in engine power is caused by air absorption into the supply system, air filter pollution, insufficient fuel supply, violation of the spray angle adjustment, deterioration of fuel spraying from the Forsaken, uneven and insufficient fuel supply from the YUBYON, insufficient compression, and lack of use of appropriate (prescribed) fuel.
B) the diagnosis of the supply system and the system hermeticity at the TCC, the condition of the fuel and air purifiers, the operation of the fuel driving pump and the high pressure pump are checked.
Of particular importance is the hermeticity of the system, which leads to the fact that if it fails, air is pushed into the system in the part from the tank to the fuel drive pump and more fuel is consumed, and the apparatus does not work well. This part is checked using a special pribor-bachok, and the rest is checked by eye. Fuel and air filters are checked by eye[7,8].
The fuel drive and the high-pressure pump are checked on the SDTA unit. The production capacity of the fuel drive pump should be at least 2.2 L per minute (for the YAMZ-236 engine), the maximum generating pressure should be 380 kPa. The angles of spraying fuel into the cylinders depend on the mode of its operation, (1-0`, 5-45`, 4-90`, 2-135`, 6-180`, 3-225`, 7-270`, 8-315` for KamAZ - 740 engines) its difference from each other should not exceed 0.5`. The ability to produce a high pressure pump is determined by the number of revolutions of the engine 1050 OBS, and the difference between 72.5-75mm^3 in each segment (for the Kamaz-740 engine) and each other should not exceed 5%. The difference in sectional production capacity (V_f) is determined as follows

(V_max - V_min)²

V_f    100 %
V_max  V_min
In this place:
V_max-sectional pointer with the most production capabilities, mm³
V_min-sectional indicator with the least production capacity, mm³
Forsunkas are examined using the niiat - 1609 pribori to determine its hermeticity, spray pressure and spray quality. Forsunka hermeticity is checked at a pressure of 30 MPa, its drop from 30 MPa to -23 MPa should not be less than 5 seconds. For new forsunks, it will not be less than 20 seconds. The spray pressure should be 17.6 mPa for KamAZ-740, 14.7 mPa for YAMZ-236 and YAMZ-238, depending on the type of engine. The spraying quality of the fuel is characterized by the uniformly foggy discharge from the spray hole of its forsunka. A well-tuned engine 400-600 ayl is in the form of a derailleur.da must work in one rhythm.
In order to carry out Adjustment work on the engines, all pribors malfunctions were eliminated, the system hermeticity was checked, fuel and air purifiers were necessarily inspected[9,10].
The current repair of equipment and details of the supply system of diesel engines consists of restoration work that does not require complex equipment and uncomplicated production technology. Such a type of work includes: rubbing the valves and their slot on the working surface (both the blocking needle and the forsunka sprayer), replacing the plunger pair and the spring that has lost its tension, restoring the tube resistors, loosening the end of the fuel transfer tubes (conical), patching the cracks in the pump housing, and other work. The repaired details of the supply system are assembled and, if necessary, fixed, tested and adjusted in a special installation and directly in the engine itself.