Reasons for Uneven Fuel Supply of Volvo Diesel Generator Fuel Injection Pump

Today we will give you a brief introduction to the reasons for uneven fuel supply of the Volvo diesel generator fuel injection pump. If you have anything to know about this, please feel free to contact us, and then we will introduce it to you the related content.

Uneven oil supply caused by mechanical failure: After long-term use, due to loose or excessive clearance of the drive coupling of the fuel injection pump, the drive gear is worn and the backlash increases, which will also affect the uniformity of the oil supply of each cylinder. In addition, leakage of high-pressure oil pipe joints due to frequent vibration or insufficient tightening, and excessive tightening force may cause the joint metal to fall off and block the oil pipes, which will also cause uneven oil supply in each cylinder. In addition, among fuel injection pumps and governor springs, the plunger springs are the ones with stronger force, greater deformation, and higher working frequency. So its breaking frequency is also higher. The lighter fuel injection volume decreases, the fuel injection volume of each cylinder is uneven, the fuel injection interval time of each cylinder is out of tolerance, and the fuel injection start time is delayed. The heavy oil supply is intermittent or even unable to supply oil.

Uneven fuel supply during commissioning: When the fuel injection pump is commissioned on the test bench, it is required that the unevenness of the fuel supply of each cylinder at the rated speed should be <3%. In the actual commissioning process, the length, shape, and diameter of the fuel injector and high-pressure fuel pipe dedicated to the test bench cannot be exactly the same as the original machine, plus the difference in debugging technology, after the fuel injection pump is installed, the oil actually injected into the cylinder The amount of unevenness is often >3%.

The debugging state is different from the use condition: the fuel injection pump is debugged at room temperature on the test bench, while the installed use is used under the conditions of cylinder compression end, cylinder temperature of 500-700℃, and pressure of 3-5MPa. The difference is large. When the locomotive is operating, the temperature of the fuel injection pump and the fuel injector both reach about 90°C, which will also cause the viscosity of the diesel to decrease. Therefore, the internal leakage of the plunger and the needle valve assembly increases, and the amount of oil return is more than during debugging. According to the measurement, the actual amount of fuel injected into the cylinder by the fuel injection pump is only about 80% of the test bench debugging volume. Although the fuel pump debugging personnel will consider this factor, it is impossible to accurately grasp it. In addition, due to the difference in the degree of wear or airtightness of the cylinder liner piston and the valve mechanism, the temperature and pressure of each cylinder after compression will also be different. Even if the fuel injection pump has been debugged on the test bench, the fuel supply of each cylinder will be uneven after installation.

Dingbo Power was founded in 2006 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, welcome send email to sales@dieselgeneratortech.com we will pay highly attention on your question.