Home Products News Contact Us
Home > Supports > Diesel Generators

Solution to Unstable Operation of Cummins Diesel Generator Set

Oct. 08, 2021

How to solve the unstable operation of Cummins diesel generator set? During the use of Cummins diesel generator set, it will encounter unstable work. Do you know how to solve the unstable operation of Cummins diesel generator set? Let we introduce to you teh details. First, the governor cannot reach the minimum speed. Method of exclusion: The high-pressure oil pipes of the upper 4 cylinders of the high-pressure oil pump were cut off one by one, and it was found that the blue smoke disappeared after the third cylinder was disconnected. After the shutdown, the third-cylinder injector was disassembled, and the fuel injection pressure test was performed on the injector. As a result, it was found that the third-cylinder injector assembly was dripping and the amount was very small.


diesel engine.jpg


Each cylinder of Cummins diesel generator set does not work well, resulting in different compression pressures of each cylinder. Remedy: Check the oil dipstick in the oil pan of the Cummins diesel generator set to see if the oil viscosity is too low or the oil volume is too much, so that the oil enters the combustion chamber and evaporates into oil and gas unburned and discharged from the exhaust pipe. But by checking the quality and quantity of Cummins diesel generator set oil, it meets the oil regulations of Cummins diesel generator set. The elastic force of the internal speed control spring of the governor is weakened, which changes the speed control performance. Method of exclusion: After starting the Cummins diesel generator set, increase the speed by about 1000r/min, and observe whether the speed is stable, but the sound of the Cummins diesel generator set is still unstable when it is heard, and the fault has not been eliminated.


Secondly, there is air, moisture or poor fuel supply in the fuel supply system. Elimination method: loosen the bleed screw of the high-pressure oil pump, press the hand oil pump, and remove the air in the oil circuit. The amount of oil supplied by the plunger of each sub-cylinder in the high-pressure oil pump is more related. Method of exclusion: Tighten the oil return screws of the high and low pressure oil pipes of the Cummins diesel generator set. The speed of the governor cannot reach the calibrated speed. Method of exclusion: Remove the high-pressure oil pump assembly and perform technical inspections on the interior of the governor. It is found that the adjustment gear rod is not flexible. After repair, adjustment and assembly, start until the speed reaches about 700r/min, and observe whether the Cummins diesel generator set works smoothly. If no abnormality is found during the inspection, the fault will be eliminated.


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.

Contact Us
  • Adds: No.2 Xingguang Road, Guxi Industrial Park, Taixing, Jiangsu, China.
  • Tel: +86 771 5805 269
  • FAX: +86 771 5805 259
  • Cellphone: +86 134 8102 4441
                    +86 138 7819 8542
  • E-mail: sales@dieselgeneratortech.com
Follow Us

Copyright © Jiangsu Starlight Electricity Equipments Co., Ltd.All Rights Reserved | Sitemap

Contact Us