Thread: Order modern diagnostics engine

 
Modern power units represent a fairly complex mechanical systems with a large number of electronics. On this basis, diagnosis the simplest engine it is often extremely difficult. For diagnostic uses a large set of equipment, and complex work is sometimes quite large. Consider the diagnostic process in more detail.

All experienced repairmen usually begin checking engine with computerized diagnostics. In a survey of electronics using a special scanner is testing all major sensors and check the operation of the power plant in real time. As practice shows, about 70% of the faults of all modern engines refers specifically to problems with their electronic components.
If during the conduct computer diagnostics errors and deviations are not observed, you can navigate to the visual test. During visual diagnosis first of all checked spark plug group. Usually the condition of the spark can give very detailed information about the operation of the power unit. Dismantled candles should be light brown shade, with a uniform scale. If the candle is black carbon or soot is uneven - it points to certain failures in the power plant and its components. In addition, the presence of oil on the spark plugs can be concluded about the deterioration of the connecting rod and piston group.
After dismantling the candles usually check the condition of all drive belts and ignition timing. For this purpose, the timing belt is installed in a special way and compared its label. This procedure is nothing specific about the current operation of the engine will not say, but it will be very useful in the future use.
The internal state of the engine is determined by the compression ratio, the measurement is performed after the dismantling of the candle group. The compression ratio in each cylinder of the engine must be at least 8 atmospheres. In addition there should be no evidence of uneven wear of satano-piston group in different cylinders, which is defined by strong fluctuations compression. Otherwise, it is impossible to expect a full and continuous operation of the power unit, and difficulties with starting "cold" is guaranteed. However, if the compression ratio fell due to long-term Parking (i.e. the occurrence of piston rings), it can be lifted with the help of special additives, pour in the spark plug hole.
Completes complex diagnostic work measuring the composition of exhaust, which is made using a special device - detector. During this experimental work, the master can determine a fairly accurate fuel consumption, the presence of the intake of outside air, the quality of the injection system, the condition of the catalytic Converter, and a number of other parameters. Measurement of the composition of the mixture, it is useful to produce not only in the diagnosis but also during maintenance of the machine.
For diagnostics of the engine there are a number of other devices that are used only in certain cases. This oscillograph and metatester. They help to carry out detailed diagnostics of electronics, testing the sensors and the measurements of the incoming pulses. These devices have extremely high sensitivity and is able to measure the pulse width of up to several millivolts. This is extremely useful for "complex" diagnostics of modern power plants.