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Setting And Normal Maintenance Of Oil Return Pipe In Diesel Engine

May. 19, 2022

The diesel generator set fuel supply system mainly completes the storage, filtration and transportation of fuel, and according to different engine operating conditions, a certain amount of fuel is increased to a certain pressure, and the fuel is injected into the combustion chamber according to the specified time. The air forms a good combustible mixture while returning the supplied excess fuel to the tank. To this end, an oil return pipeline is set up in the entire fuel supply system. In order to ensure that the fuel supply has a certain pressure, an oil return valve is set in the oil return pipeline to ensure the normal operation of the engine.

 

The following are the issues that should be paid attention to in maintaining the oil return pipe:

1. Prevent blockage: Some diesel engines are equipped with oil return valve on the diesel filter, and the valve cannot be screwed tightly, for the oil return pipe without oil return valve, keep it unobstructed. If the diesel engine has failures of poor acceleration and automatic flameout, the oil return pipe should not be blocked rashly (but it is allowed to temporarily cover it as a means of inspection) before the fault is clarified, otherwise, the oil return line will lose the ability to adjust the oil pressure function, the diesel engine can not work in severe cases.

 

diesel engine


2. Prevent leakage: The oil return valve and its valve seat should be checked regularly for wear and corrosion. During maintenance, check whether the oil return valve is padded with debris to prevent internal leakage and backflow. Oil leakage from the oil return pipe joint not only pollutes the environment, but also easily sucks in air and wastes fuel at the same time. Therefore, for those who have used copper or aluminum washers, check whether they are bruised and deformed, and if necessary, place them on a flat plate and use fine emery cloth to grind the washers or replace parts. The disposable sealing gasket should be replaced after disassembly. It is recommended to use a copper or aluminum sealing gasket to prevent leakage of the low-pressure oil circuit and air intake.

 

2. Prevent wrong installation: When maintaining and assembling the fuel supply system, the oil return pipe cannot be installed at the oil inlet end of the fuel injection pump, and the oil return valve cannot be installed with fewer parts or in the wrong position. Nor can the oil return valve be replaced with ordinary oil pipe joint bolts. In addition, do not connect the oil return pipe to the intake pipe. Because this part of the return oil is not pressurized and atomized, if it is directly inhaled into the cylinder for combustion, the fuel will not be completely burned, which will increase the fuel consumption and form a large amount of carbon deposits, which will shorten the service life of the diesel engine.

 

The above is the setting and normal maintenance of the oil return pipe of the diesel engine. Jiangsu Starlight Electricity Equipments Co.,Ltd. is a manufacturer of professional generators, diesel generator sets, Cummins generator sets, Volvo generator sets, etc. The company has advanced testing equipment, excellent production technology, professional manufacturing technology, perfect quality management system, and Strong R&D technical strength. It can provide 15KW-2500KW various specifications of universal, automatic, four protection, automatic switching, low noise and mobile, etc., high-quality, low-energy generating sets to meet customer power needs, and can also meet users' different voltages and different frequencies, as well as the power supply system of multiple units connected in parallel, welcome customers to inquire. For more details, please contact us with sales@dieselgeneratortech.com.


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