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Judgment Method Of outlet Valve Spring Fracture

Aug. 16, 2021

As the main backup power source for factories, construction sites, schools and other enterprises and institutions, diesel generator sets have become more and more popular in recent years. With the increase in frequency of use, diesel generator sets will inevitably have various faults, such as this There was feedback from users in just two days: After the diesel generator set started, the oil temperature was above 30℃, the water temperature was above 40℃, and when the basic speed reached the basic speed, the cylinder had a particularly loud knocking sound. Is the outlet valve spring of the high-pressure fuel injection pump broken? So this article, Jiangsu Starlight Electricity Equipments Co.,Ltd. will specifically talk about the judgment method of the breakage of the outlet valve spring of the fuel high-pressure fuel injection pump of the diesel generator set.

 

To determine the cause of a failure, you must first know its function. The main function of the oil outlet valve of a diesel generator set is:

 

1. The oil outlet valve of the diesel generator set separates the plunger cavity and the high-pressure oil pipe from each other when it is not supplying fuel to prevent the fuel from the high-pressure oil pipe from being sucked back into the oil pump cavity when the plunger descends.

 

2. The oil outlet valve of the diesel generator set maintains a certain residual pressure in the high-pressure oil pipe, so that the fuel pressure in the high-pressure oil pipe can rise quickly during the next fuel injection.

 

3. The oil outlet valve of the diesel generator set can quickly reduce the oil pressure in the high-pressure oil pipe when the fuel supply of the fuel injection pump ends, so as to ensure that the oil is cut off and clean and eliminate the oil dripping of the fuel injector.

 

diesel engine


After understanding the fault phenomenon and the main function of the delivery valve, the user can judge whether the delivery valve spring of the high-pressure fuel injection pump of the diesel generator set is broken according to the following judgment methods:

 

1. Always keep the diesel generator set at the basic speed.

 

2. Lightly touch the high-pressure oil pipe with the tip of your thumb, index finger and middle finger. Compared with other cylinders, the oil flow pulse is weak and the dividing point is not clear.

 

3. Check the position of the oil supply ruler of the high-pressure pump of this cylinder. If it is inconsistent with other cylinders, it can be artificially placed in the same position. At this time, there is still a loud knocking sound.

 

4. After the cylinder is thrown away from the oil supply rod, the knocking sound disappears, but the high-pressure oil pipe still vibrates slightly.

 

5. After the cylinder is shaken, use a 27mm wrench to loosen the high-pressure pump and the high-pressure oil pipe joint by half a turn or a turn, and the fuel will be sprayed regularly.

 

Based on the above inspection and analysis, it can be judged that the oil outlet valve spring of this cylinder has been broken, and the user should replace it in time. When the diesel generator set fails, the user can refer to the unit maintenance manual for maintenance. If you don't understand the unit, you must not dismantle it rashly for overhaul. You should contact the relevant technicians for on-site maintenance in time to avoid greater damage to the unit.

 

Jiangsu Starlight Electricity Equipments Co.,Ltd. is a diesel generator set manufacturer with more than 40 years of production experience. Its main brands include Yuchai generator sets, Cummins generator sets, Volvo generator sets, etc., and 64 sales and service departments nationwide. Users provide one-stop service of design, supply, debugging and maintenance. Welcome contact us by email sales@dieselgeneratortech.com


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