The failure of small diesel generator set diesel engine is difficult to start or even unable to star

The prerequisite for the normal operation of the diesel generator set is that the well-atomized diesel can be burned in the chamber accurately and timely, and the compressed air in the combustion chamber can only catch fire and explode when it reaches the temperature of the motherland. To meet these two conditions, it is necessary to have a high enough speed and make the cylinder with a certain temperature when the diesel engine starts, when the diesel generator set can not start, the reason should be found from the starting work, diesel engine fuel supply system and compression, etc., from the following aspects of consulting to consider the problem, so as to solve the essence of the problem, in addition to the starting speed of a machine will also lead to the occurrence of the whole problem, the starting speed is low, for the diesel engine of the hand crank, the speed should be gradually increased, Then pull the pressure reducing handle to the non-decompression position, so that the cylinder has normal compression, if the pressure reducing mechanism is not properly adjusted or the valve is against the piston, it often feels that the rocking car is very laborious, and its characteristic is that the crankshaft turns to a certain part and cannot rotate, but can be returned.

At this point, in addition to checking the decompression mechanism, you should also check whether the timing gear engagement relationship is wrong. For the diesel engine using the electric starter, if the starting speed is extremely slow, most of the starter is weak, which does not mean that the diesel engine itself is faulty. A detailed inspection of the electrical wiring should be carried out to determine whether the battery is sufficiently charged, whether the wires are connected tightly and whether the starter is working normally.

Once the circuitry of the starting system has been tested and proven to be faultless, it is time to focus on why the Cummins diesel generator engine is not running. Generally speaking, the ignition system of the engine is tested first, which is also the easiest inspection job. In early ignition systems, you could easily remove the ignition coil and use a spark detector to detect if the spark was normal.

When choosing a spark detector, an adjustable detector is preferable to a fixed design, as it allows you to adjust the detector to a smaller gap so you can tell if there is no spark at all, or if there is a spark but it is weak.

For Cummins diesel generator set engine failure to start this kind of fault, the first work to do is to test the circuit in the engine starting system.

From the perspective of the most basic composition, the circuit of the starting system generally includes the following basic parts, that is, the battery, the starting motor and the cable connecting these parts. Of course, in addition to this, ignition switches, starter relays or solenoid coils, as well as in-vehicle anti-theft systems, are also important components of the starting system.

For the diagnosis of such faults that the Cummins diesel generator set engine cannot start, the battery should be tested first. It is necessary to find out if the engine does not start because the battery is insufficient.

Failure causes and solutions for diesel generator sets that cannot be started.

Cause of failure: The battery voltage is too low or the battery capacity is insufficient; The control start loop is not supplied normally; The starting relay is not working; The starter motor is not working.

Troubleshooting: Check the battery voltage, the voltage is 12V, 24V when it is not started, and the battery voltage during the startup process (12V system shall not be lower than 9V; 24V system shall not be less than 18V); Check whether the DC power supply circuit fuse or switch is closed, make sure.

The power supply of the control loop is normal; Check the starting relay to confirm that it can work properly when it gets a working power supply; Check the starter motor to see if it is working properly when it is powered up.

When we encounter a situation that cannot be started, we have to carry out reasonable maintenance according to the specific reasons of Zhidao, but the common problem solutions are as follows: (for reference only: Yanan diesel generator answer: 4000-080-999).

1. When encountering a fault caused by the fuel return system, we can disassemble the engine and clean up its interior to check whether the fuel pump is blocked, and whether there is oil leakage or air leakage.

2. Inspect and regularly replace parts that are easy to wear.

3. In cold weather, the preheating start method should be adopted.