Diagnosis and Treatment of Deutz Generator Sets with Low Smoke Emission

Diagnosis and Treatment of Low Smoke Emission in Deutz Generator Sets with Normal Low - Speed and Short - Term High - Speed Operation

The engine idles well, and the diesel engine speed can rise rapidly when the accelerator is depressed. However, when the accelerator is continuously depressed, the speed is difficult to increase. The vehicle lacks power, or it cannot run in gears above the medium - speed range. This is caused by insufficient low - pressure fuel supply. The reasons are as follows:

The diesel filter or the oil - water separator is clogged.

The low - pressure oil circuit is not smooth.

The fuel transfer pump has insufficient fuel supply or the intake filter screen is clogged.

The intake valve of the fuel tank cap fails.

All the above situations can cause insufficient fuel pressure in the low - pressure oil chamber of the fuel injection pump, which can only maintain the fuel supply required for a small load. When more fuel is needed for large and medium loads, the demand cannot be met, resulting in a lack of power during operation.

Treatment methods:

Check whether the intake valve of the fuel tank cap fails. If it fails, a certain vacuum will be formed in the fuel tank, and diesel cannot be sucked out. This phenomenon often occurs when the fuel tank cap is lost and then sealed with an air - impermeable plastic sheet.

Check whether the low - pressure oil pipe is dented and whether the filter screen at the inlet pipe joint is clogged.

If the fuel filter or the oil - water separator has not been replaced for a long time, replace them in time.

Check whether the fuel transfer pump is working properly. If the fuel transfer pump has insufficient fuel supply, replace or repair it in time.

Diagnosis and Repair of Low Smoke Emission in Deutz Generator Sets with Normal Low - Speed but No High - Speed Operation

The engine runs well at low speeds, but the speed cannot increase when accelerating, and the vehicle lacks power. This is caused by insufficient cyclic fuel supply. The reasons are as follows:

The fuel injection pump is improperly adjusted, resulting in a reduced fuel supply.

The spring of the governor loses its elasticity due to fatigue. When the accelerator pedal is fully depressed, the fuel quantity adjustment rod cannot move forward to the end, resulting in a reduced fuel supply from the fuel injection pump and the engine being unable to reach the rated speed.

The plunger and sleeve of the fuel injection pump, and the needle valve and needle valve body of the injector are severely worn, resulting in more diesel leakage during pumping and a relatively reduced fuel supply.

The accelerator control rod is improperly adjusted, or the accelerator pedal pin is loose, causing the accelerator pedal not to reach the proper position and resulting in an insufficient fuel supply at full load.

There is air in the oil circuit.

Treatment methods:

When the engine has insufficient power but runs well at low speeds and has normal smoke emission, it indicates that the engine burns well, i.e., the diesel injection quality is good, the fuel supply start time is normal, the cylinder sealing is good, and the intake air is sufficient. When the low - pressure oil circuit is normal, first check the looseness of the connecting pin of the accelerator pedal and whether the length of the connecting rod is properly adjusted. When the accelerator pedal is fully depressed and the governor control arm is at the maximum position, the high - speed limit screw should be in contact with the limit block. Otherwise, adjustments should be made.

Eliminate the air in the oil circuit.

Debug the fuel injection pump on the fuel injection pump test bench to eliminate the fault.

Dingbo Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to [email protected] we will pay highly attention on your question.