Analysis of Insufficient Power in Cummins Generators

Causes of Insufficient Power in Cummins Generators

The main characteristics of insufficient power in Cummins generators are unstable low-speed operation, black smoke from the exhaust pipe at high speed, and abnormal noise. When the Cummins generator has not reached the overhaul period, insufficient power is mainly caused by failures in the fuel supply system and insufficient cylinder compression.

Troubleshooting Plan for Insufficient Power in Cummins Generators

First, check with no load. If the throttle is increased and the no-load can reach the maximum speed, the fault lies in the working machinery. If the no-load speed cannot increase, the fault is in the diesel engine.

Check the temperature at the root of the exhaust manifold. If the temperature of a certain cylinder is low, that cylinder is not working or working poorly. At low speed, you can use your fingers to touch and check, but not at high speed to prevent scalding your fingers. At this time, you can spit saliva on the root of the exhaust manifold. If the saliva does not make a "sizzling" sound, there is a fault in that cylinder.

Pinch the high-pressure oil pipe with your fingers. If the pulsation is strong and the temperature is higher than other cylinders, it indicates that the oil pump is in good condition, and the fuel injector may be stuck in the fully closed position or the pressure of the injector pressure regulating spring is too high; if the pulsation of the high-pressure oil pipe is weak and the temperature is the same as other cylinders, it indicates that the fuel injector is stuck in the fully open position or the pressure regulating spring is broken. If there is no pulsation in the high-pressure oil pipe at high speed and the temperature is higher than other cylinders, it indicates a fault in the high-pressure oil pump. If the exhaust pipe emits smoke rings at low speed, it indicates that the spring of the outlet valve of the high-pressure oil pump is broken or the gasket is invalid. If there are no abnormal symptoms in the fuel system, the fault is poor cylinder compression.

During operation, if the air leakage under the oil filler port increases and the smell of ambient oil is strong, it means that the gap between the piston and the cylinder is too large and the sealing is poor. When stopping, if you use a screwdriver to turn the flywheel for two weeks, and the number of times the hand feels increased resistance is not equal to the number of cylinders, you can judge that a certain cylinder has poor compression based on the hand feeling. If there is a hissing sound at the joint between the cylinder head and the cylinder block, the ambient smoke is thick, and there is a smell of burnt smoke, it indicates that the cylinder gasket is leaking. If there is a metal knocking sound at the cylinder cover shell, which is related to the rotation speed and regular, it indicates that the gap between the rocker arm and the valve is too large. If there is a hissing sound at the cylinder head, the temperature at the root of the intake manifold is high at low speed, and there is a hissing sound at the intake pipe when stopping, it indicates that the intake valve is leaking; if the exhaust pipe emits black smoke at high speed and the exhaust pipe spits fire at night, it indicates that the exhaust valve is leaking.

Guangxi Dingbo Generator Set Manufacturing Co.,Ltd. was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to [email protected] we will pay highly attention on your question.