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Must The Diesel Generator Set Be Run In Before Reuse After Overhaul

Apr. 28, 2023

After the diesel generator set has been used for a certain period of time, various faults or hidden troubles may occur, which need to be repaired accordingly. According to the cumulative operating time or damage degree of the unit, it can be divided into minor repair, medium repair and major repair. Generally speaking, if the cumulative service time of the diesel generator set reaches 9000-15000 hours, major repair and maintenance can be carried out. Jiangsu Starlight Electricity Equipments Co.,Ltd. reminds you that the overhauled diesel generator set must be run in before it can be put into use again. Why? To understand the reasons behind this, users first need to understand what major repairs include.


In addition to minor and medium maintenance, the overhaul of diesel generator set also includes the following contents:


1. Disassemble all diesel generator engines


2. Replace the cylinder block, piston, piston ring, large and small bearing shells, crankshaft thrust pad, intake and exhaust valves, and a complete engine overhaul kit


3. Adjust the oil pump, fuel injector, replace the pump core, and fuel injector


4. Replace the supercharger overhaul kit and water pump repair kit of the diesel generator


5. Correct the connecting rod, crankshaft, engine body and other components, and repair or replace them if necessary


diesel generator set

6. Dust removal of motor stator and rotor


7. Inspect the insulation characteristics of the stator and rotor coils


8. Check and restore the control circuit of diesel generator engine


9. Detect the high water temperature and low oil pressure protection function of the diesel generator engine, and replace the damaged parts


10. Detect all instruments on the control panel and activate the switch.


From the above, we can see that many new parts are replaced during the overhaul and assembly of diesel generator, and the surface of the newly assembled parts is rough, which often leads to that the new parts cannot form normal fit clearance with other parts or parts at the initial stage, and can only operate normally after running in. Generally, the running in of diesel generator set is divided into cold running in and hot running in.


Cold running in: the diesel generator can be operated by battery or manually prying the flywheel of the diesel engine without starting. After cold running in, all lubricating oil in the oil pan of the diesel generator shall be drained and cleaned with cleaning oil.


Hot running in: the running in shall be carried out without load first. At this time, the running in speed of diesel generator can be controlled within 1300r/min. After all technical indicators meet the requirements of no-load running in, the hot running in on load shall be carried out. This period of time is generally about 60h, and the operator of diesel generator can also be determined according to the specific situation. During the loading process, there should be a gradual increase in load from small to large until the diesel engine reaches the normal standard of on-load thermal running-in. Temperature control: during thermal running in of diesel generator, the temperature of lubricating oil shall be controlled within 651C-75 ℃, and the temperature of cooling water shall be controlled within 70 ℃ - 80 ℃.


It is worth noting that not only the overhauled diesel generator set needs to be run in, but also the newly purchased diesel generator set must be run in for a certain time before it can be put into full load use.


Jiangsu Starlight Electricity Equipments Co.,Ltd. is one of the earliest manufacturers of generators and diesel generator sets in China. The company relies on high-quality products and good services. It has been widely recognized by users in many fields. At present, it can provide various specifications of diesel generator sets in the power range of 15KW-2500KW. For more details, please contact us with sales@dieselgeneratortech.com.

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