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Causes of Unstable Idle Speed of Diesel Generator Set

Aug. 15, 2023

During the use of the diesel generator set, it is inevitable that there will be some large and small failures, including the unstable idling of the engine, and the unstable rotating speed of the set will easily lead to the diesel generator set flameout. Generally speaking, such failures are easy to occur when there is a failure in the high-pressure oil circuit or the low oil circuit, but they are not absolute, failure of the following components may also cause the diesel generator set to stall due to unstable idle speed. Now let's follow Guangxi Dingbo to understand the cause of the failure and the countermeasures.


1. Faulty fuel injection pump

Use the starter to drive Volvo generator. If it can rotate normally, observe whether the camshaft of the fuel injection pump rotates. If it rotates normally, the fuel injection pump is faulty. Check whether the operation of the control mechanism is normal. Pull the throttle lever to check whether the connection between the control arm and the operating shaft is good.


2. Camshaft or gear failure

Use the starter to drive the diesel generator. If the injection pump camshaft does not rotate, the fastening bolts of the camshaft gear are loose, the camshaft is broken, or the gear in the gear chamber is faulty.


Volvo Power Generator Set


3. Diesel generator internal fault

If the starter fails to drive the diesel generator, it indicates that the diesel generator has internal fault. For example, the piston and cylinder are stuck, the crankshaft and bearing are locked, the plunger of the fuel injection pump is stuck, and the mechanical failure of the valve train occurs. Under normal conditions, open the valve cover to check. If the oil pressure is too low or the temperature is too high as reflected on the instrument during operation, the maintenance shall be carried out directly according to the specific conditions.


The above is the unstable idle speed fault of the diesel generator set caused by the failure of parts. In addition, it is worth noting that if there is water in the diesel, the diesel generator may also have a high or low speed before stalling. At this time, the user should timely remove the water or replace the diesel.


Dingbo Power has advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, and strong technical research and development capabilities. It can provide 3KW~2500KW various specifications of ordinary, automatic, four protection, automatic switching, low noise and mobile generator sets, high quality and low energy consumption to meet the diverse power needs of customers, and can also meet users with different voltages and different frequencies. It is required to create a parallel power supply system for multiple units. If you are interested in Cummins generators or any question on generator, welcome to send email to sales@dieselgeneratortech.com.

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