Engine maintenance and start-up considerations

First, matters needing attention

Dongfeng Cummins engine (20-200KW)

(1) Cummins engine normal starting requirements

1. Cummins starter does not exceed 30s per run, and the interval between restarts is 2min.
2. The lubricating oil pressure should reach 70KPa within 15s after starting, otherwise check the oil surface immediately.
3. After starting, the idle speed will be 3-5min to increase the load. Otherwise, the bearing bush will have insufficient oil supply.
4. The idle speed should not exceed 10 minutes, otherwise there will be undesirable phenomena such as carbon deposit in the combustion chamber and oil leakage from the Cummins engine supercharger.
5. Cummins engine water temperature should not be lower than 60 ° C, otherwise the fuel will enter the oil and destroy the lubrication, you can use the empty car to accelerate the water temperature.
6. Keep the idle speed after starting in winter, until the water temperature indicator is turned or 10 minutes later. Observe the water temperature gauge and pay attention to whether the oil pressure gauge meets the requirements. Always use a sprayer with a metered hole when using the auxiliary starter fluid in winter.

(2) Cummins engine basic operation requirements

1. Always observe the instrument during Cummins engine operation: the water temperature should be between 74 °C and 91 °C; the oil pressure should be greater than 70 KPa at idle speed and 276-517 kPa at 1200 r/min or higher.
2. If the Cummins engine is overheated, the load should be reduced. If the load is reduced after running for a period of time, stop it and check the fault.
3. Cummins engine operation should pay close attention to the following changes of the engine, if any one of them suddenly changes, it is likely to be a sign of failure, please check and repair it in time.

1 engine fire or fire is bad; 2 vibration situation; 3 engine has abnormal noise; 4 engine working pressure, sudden temperature change; 5 engine exhaust smoke is too large; 6 engine power is insufficient; 7 engine oil consumption becomes large; The consumption becomes larger; 9 fuel, oil or water leaks.

(3) Cummins engine operating range

1. When the Cummins engine is below the maximum torque speed, the full throttle operation should not exceed 30s, otherwise the engine overhaul life will be shortened and the engine may be seriously damaged. Cummins engines work best above the maximum torque speed point, so it is recommended to operate Cummins engines within this range.
2. Under no circumstances or in the environment, Cummins engines should not exceed the maximum empty speed.

(4) Cummins engine operating in a cold environment

Special oil, fuel and coolant should be used when operating the engine in extremely cold environments.

(5) Cummins engine shutdown

1. Cummins engine requires idle speed of 3-5min before stopping. Because the diesel engine idles for 3-5 minutes before each stop, it allows the oil to take away heat from the combustion chamber, bearings and oil seals, especially the supercharger. If the machine suddenly stops, the bearing and oil seal are likely to be killed.
2. The Cummins engine can be shut down by cutting off the current of the fuel pump solenoid valve.

Technical Articles

Cummins, DCEC, Engine, maintenance, overhaul

Related Items