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Analysis Of The Reasons For Uneven Fuel Supply Of Volvo Diesel Generators

Jun. 13, 2022

The uneven fuel supply of Volvo diesel generators often leads to abnormal situations such as insufficient power, black smoke from the exhaust, and unstable rotation speed, which will directly affect the power, economy and reliability of the diesel engine. Therefore, users should clearly understand why the unit has uneven oil supply. Below, Jiangsu Starlight Electricity Equipments Co.,Ltd. will analyze the reasons for the uneven oil supply of Volvo diesel generators in different states.


1. The difference between debugging status and usage conditions.

The fuel injection pump is debugged at room temperature on the test bench, while it is used when the cylinder is compressed, the temperature in the cylinder reaches 500-700°C, and the pressure is 3-5MPa. There is a big difference between the two. When the Volvo diesel generator is operating, the temperature of the fuel injection pump and the fuel injector is about 90 ℃, which will also cause the diesel viscosity to drop. Therefore, the internal leakage of the plunger and the needle valve coupler increases, and the oil return volume is also larger than that during debugging. According to the measurement, the actual amount of oil injected into the cylinder by the fuel injection pump is only about 80% of the debugging amount of the test bench. Although the oil pump debugging personnel will consider this factor, it is impossible to accurately grasp it. In addition, the temperature and pressure of each cylinder after compression will also be different due to the wear and tightness of the cylinder liner piston and the valve mechanism. Even if the fuel injection pump is debugged on the test bench, after installation and use, the fuel supply of each cylinder will be uneven.


2. Uneven oil supply during commissioning.

When the Volvo diesel generator fuel injection pump is debugged on the test bench, it is required that the unevenness of the fuel supply of each cylinder at the rated speed should be less than 3%. In the actual debugging process, because the length, shape, and diameter of the fuel injector and high-pressure fuel pipe dedicated to the test bench cannot be completely consistent with the original machine, plus the difference in debugging technology, after the fuel injection pump is installed, the actual amount of oil injected into the cylinder. Quantity unevenness is often > 3%.

Volvo diesel generator


3. Uneven oil supply caused by mechanical failure.

Volvo diesel generators have been used for a long time. Due to the loose coupling or excessive clearance of the fuel injection pump drive coupling, the drive gear is worn and the backlash increases, which will also affect the oil supply uniformity of each cylinder. In addition, due to frequent vibration or insufficient tightening of the high-pressure oil pipe joint, as well as excessive tightening force, the metal of the joint will fall off and block the oil pipe, which will also cause uneven oil supply to each cylinder.


In addition, among the fuel injection pump and governor spring, the plunger spring is the one with stronger force, larger deformation and higher working frequency. Therefore, its breaking frequency is also higher. In the lighter cases, the fuel injection volume is reduced, 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. In severe cases, the oil supply is interrupted or even unable to supply oil.


Jiangsu Starlight Power Generation Equipment Co., Ltd. was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 218.88 million yuan. The company covers an area of 86,000 square meters and a building area of 55,000 square meters. There are more than 660 employees, including 456 professional technicians and 106 senior technicians. It has 46 sales and service outlets nationwide. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Starlight has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to sales@dieselgeneratortech.com.

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