Causes of failure to start a diesel engine

The main causes of failure to start diesel engines

If the engine does not start when you turn the ignition key, then one of the factors of the malfunction has manifested itself. How to determine it? Is it necessary to diagnose and repair the diesel engine? So, the first thing to do is to check whether the battery is charged enough. If the car does not start for a long time, and in addition, it does not work the basic units, then such a car is easier to pass for recycling, than to spend time and money on attempts to repair:

It is believed that most starters in modern cars are not able to work if the battery voltage is less than 10 volts. However, it should not be excluded that the problem of refusal to start the engine may be connected not only with the discharged battery.

Practice shows that it discharges very quickly, when the driver unsuccessfully cranks the starter several times to start the engine. Probably, the cause of the breakdown lies in a faulty charger. In general, there are several reasons. Still, the first thing to pay attention to is the battery, which, if necessary, will have to be tested and charged.

The first steps

If it turns out that the battery is really discharged, in this case, it is recommended to use another battery or charger to try to start the engine with it. In addition, it is not superfluous to check the efficiency of the charger.

Parameters of properly working battery chargers

A properly working battery charger is said to produce 14 volts during charging. It is very important that lights and other auxiliary equipment are turned off at this point.

The first start of the engine after charging is usually characterized by a sudden voltage increase of about 2 volts relative to the battery voltage. This is not critical as after a few minutes the voltage will decrease and will eventually reach the standard value.

The charging voltage level shows different readings depending on how much the battery is charged. For example, the charging voltage gradually decreases when the temperature rises.

According to experts, a standard alternator has a charging range of 13.9 to 14.4 volts at 80 degrees (Fahrenheit). If the temperature is sub-zero, then the range will increase to 14.9 to 15.8 volts. 

How to proceed if the charger does not develop the desired voltage

The cause of this problem is in the alternator or regulator. To check the technical condition of the alternator, bypass the regulator. As a last resort, the alternator should be taken to a service center for bench diagnostics.

There are cases when the charging voltage is unacceptably high, in spite of the uninvolved regulator. This is most likely a defect in the regulator itself or in the engine control unit. If the output voltage does not contribute to any changes, in this case, the lack of voltage is due to a broken alternator.

So, using this information, you now know more and you will be able to react on time in case of malfunctions.

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